# 2026 & 2027 Tech OA & Interview Questions
๐Ÿข Full company list (480+) โ€” click to expand Abnormal Security, Abridge, Accenture, Addepar, Adobe, Adyen, Affirm, Agoda, Airbnb, Airbyte, Airtable, Airwallex, Akuna, Akuna Capital, Alarm.com, Alchemy, Alpaca, Alteryx, Amazon, Ambience Healthcare, AMD, American Express, amo, Amperity, Anchorage, Anduril, Angel One, Anrok, Anthropic, Anyscale, Apple, Applied Intuition, Arista Networks, Asana, Assort Health, Astrotalk, AT&T, Atlassian, Atlys, Attentive, Aurora Innovation, Autodesk, Axon, Barclays, Baseten, Belvedere Trading, Benchling, Better.com, Bilt Rewards, Birla Pivot, BitGo, Blackrock, Blinkit, Bloomberg, Bloomberg LP, BNP, BNSF Railway, BNY Mellon, Bobyard, Booking.com, Boston Consulting Group, Box, Braze, Brex, Broccoli AI, ByteDance, Candid Health, Canva, Capgemini, Capillary Technologies, Capital One, Careem, CARS24, Carta, Cashfree Payments, Celebal Technologies, Cerebras, Chainalysis, Character.AI, Charta Health, Checkr, Chicago Trading, Chicago Trading Company, Chubb, Circle, Cisco, Citadel, Clay, ClearTax, Clickhouse, ClickUp, Clio, Clipboard Health, Cloudflare, Coalition, Cockroach Labs, Codeium, Cognitiv, Cohere, Cohesity, Coinbase, CoinDCX, College Vine, Commure, Commvault, Compass International Holdings, Concentric AI, Confluent, CoreWeave, Coupa Software, Coupang, Cresta, CrowdStrike, Crusoe, Cursor, Cvent, Databricks, Datadog, DatologyAI, David AI, DE Shaw, Decagon, Deliveroo, Dell Technologies, Deloitte, Deutsche Bank, DigitalOcean, Discord, Disney Careers, Distyl AI, DocuSign, DoorDash, Dropbox, DRW, DTCC, Ease, Eat Club, eBay, Edge, Eightfold, Elastic, ElevenLabs, Epam, Epic, Epify, Ericsson, Etched, EvenUp, Expedia, FactSet, Faire, FamPay, Figma, Fireworks AI, Fivetran, Flexport, FlexTrade, Flipkart, FluidStack, Fortinet, Fox Corporation, Freshworks, FurtherAI, Gatik AI, GE Vernova, Gecko Robotics, Geico, General Motors, Geneva Trading, GEP, Get My Parking, Giga, GitHub, Glean, Globalization Partners, GoDaddy, Gojek, Goldman Sachs, GoodScore, Google, Grab, Grammarly, Groww, Grubhub, Guidewire, Gusto, HackerRank, Hadrian, Harness, Hartford Financial Services, Harvey, Headlands, Headlands Technologies, Headway, Hebbia, Helm.ai, Highspot, HSBC, Hudson River Trading, Hyper Verge, HyperVerge, IBM, IDFC, Illumio, IMC, IMC Trading, Indeed, Infosys, InMobi, Instacart, Intuit, Ironclad, IXL Learning, Jane Street, Jefferies, JioStar, JP Morgan, JP Morgan Chase, JPMorgan Chase, Juniper Square, Juspay, Kalshi, Karat, Kaseya, Keka HR, Keychain, Kickdrum, Klaviyo, Kotak Mahindra Bank, Lambda, LangChain, Latent, Legora, Lenskart, LinkedIn, LiveKit, Lloyds Banking Group, Lokal, London Stock Exchange, LSEG, Luma AI, Lyft, MakeMyTrip.com, Marshall Wace, Mastercard, MathWorks, Matroid, Maven Clinic, Maven Securities, McKinsey & Company, Medallion, Meesho, Mercor, Mercury, Mercury Insurance, Meta, Micro1, Micron Technology, Microsoft, Millennium, Mintlify, Mistral AI, Modal, Modal Learning, Modular, MongoDB, Morgan Stanley, Motive, Moveworks, Mygate, NatWest, Navan, Navi, Netflix, New Relic, Nextdoor, Nielsen, Nike, Inc., Ninja Van, Nooks, Notion, Nubank, Nuro, Nutanix, Nvidia, NxtPe, Nykaa, Observer.AI, Odoo, Okta, Old Mission, Omnissa, Onehouse, OnePay, OneTrust, Onix, OpenAI, Opendoor, Optimus Information, Optiver, Oracle, Oscar Health, Otter.ai, Oura, Pace Stock Broking Services, Palantir, Patreon, Paypal, PayPay, Paytm, Pelatro, PeopleStrong, Perplexity AI, Persona, PhonePe, Physical Intelligence, Pinecone, Pinterest, Plaid, Point72, PostHog, Postman, Profound, Proofpoint, Publicis Sapients, Pure Storage, QRT, Qualified Health AI, Quince, Quora, Ramp, Razorpay, Reddit, RedNote, Reducto, Reevo, Remitly, Render, Replit, Retell AI, Retool, Revolut, Rippling, Rivian, Robinhood, Roblox, Rogo, Roku, Rubrik, Runloop, Runway, Rupeek, Rurik, Safe Security, Salesforce, SambaNova Systems, Samsara, Samsung, SAP, Sarvam AI, SavantLabs, Scale AI, Scribd, Securonix, SeekOut, SentinelOne, Sentry, ServiceNow, Sesame, Shield AI, Shopify, Siemens, Sierra, Sig, Skydio, Skyscanner, Slack, slice, Snap Inc., Snorkel AI, Snowflake, Sofi, Solytics Partners, SpaceX, Sphere, Splunk, Spotify, Spotnana, Sprinter Health, SquadStack.ai, Square, Squarepoint, Squarepoint Capital, Stable Money, StackAdapt, State Farm, Straive, Strala, Strava, Stripe, Sumo Logic, Suno, Supabase, Superhuman, Susquehanna International Group, Susquehanna International Group (SIG), Swiggy, Syfe, Target, TCS, Tekion, Temporal, Temu, Tennr, Teradata, Tesco, Tesla, The D. E. Shaw Group, The D.E. Shaw Group, The Trade Desk, The Voleon Group, The Walt Disney Company, ThoughtSpot, TikTok, Toast, Together AI, Toptal, Toshiba, Trade Desk, Trend Micro, Twilio, Twitch, Two Sigma, Uber, Uber Freight, UiPath, Unity, Upstart, Urban Company, Valon, Vanguard, Vanta, Vercel, Verisk, Verkada, Visa, Waabi, Walleye Capital, Walmart, Walmart Labs, Wayfair, Waymo, Wayve, Wells Fargo, WeRide, Wex, Whatnot, Wise, Wolverine Trading, Wonderful, Workday, World Wide Technology, Xperi, YahoO, Yellow.ai, Yelp, Ziina, Zip, Zipline, ZipRecruiter, Zolando, ZoloStays, Zomato / Eternal, Zoom, ZoomInfo, Zoox, Zopsmart, Zorvyn, ZS, Zscaler.
[Submit an OA](https://github.com/perixtar/2026-Tech-OA-by-FastPrep/issues/new?template=oa-submission.yml) ยท [Discord](https://discord.gg/kSbWpSGUTH) ยท [Guide](CONTRIBUTING.md) ## ๐Ÿ—‚๏ธ Question Bank [โฌ‡ bottom](#bottom) Newest first ยท ๐Ÿ”ฅ 2 weeks ยท ๐Ÿ†• 45 days Formats: [Coding (4,080)](formats/coding.md) ยท [SQL (90)](formats/sql.md) ยท [System design (641)](formats/system-design.md) ยท [Low-level design (201)](formats/low-level-design.md) ยท [AI coding (122)](formats/ai-coding.md) [p]: assets/practice-button.svg Page 1 ยท [Next โ†’](question-bank/page-2.md) | Company | OA / Interview Question | Format | Practice | Updated | | :-- | :-- | :-- | :-: | :-- | |**DoorDash**|[Integrate Three Profile Services](https://www.fastprep.io/project-coding/doordash-service-profile-aggregator)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/doordash-service-profile-aggregator)|๐Ÿ”ฅ Oct 30, 2026| |**DoorDash**|[Design Payments for a Short High-Traffic Event](https://www.fastprep.io/system-design/high-traffic-event-payment-flow)|System design|[![Practice][p]](https://www.fastprep.io/system-design/high-traffic-event-payment-flow)|๐Ÿ”ฅ Oct 30, 2026| |**Microsoft**|[Design a Financial Records Dashboard and History Table](https://www.fastprep.io/system-design/financial-records-dashboard-and-history-table)|System design|[![Practice][p]](https://www.fastprep.io/system-design/financial-records-dashboard-and-history-table)|๐Ÿ”ฅ Oct 30, 2026| |**Rippling**|[In-Memory Priority Task Scheduler](https://www.fastprep.io/problems/rippling-priority-task-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-priority-task-scheduler)|๐Ÿ”ฅ Oct 29, 2026| |**Nykaa / Navi / Atlys / Rippling**|[Design a Shared Expense Splitting Service](https://www.fastprep.io/low-level-design/shared-expense-splitting-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/shared-expense-splitting-domain)|๐Ÿ”ฅ Oct 29, 2026| |**Rippling**|[Design a Multi-Tenant Employee Leave Management System](https://www.fastprep.io/system-design/multi-tenant-employee-leave-management)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multi-tenant-employee-leave-management)|๐Ÿ”ฅ Oct 29, 2026| |**Autodesk**|[Design a Shape Transformation Engine](https://www.fastprep.io/low-level-design/shape-transformation-engine)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/shape-transformation-engine)|๐Ÿ”ฅ Oct 29, 2026| |**Google / Microsoft / LinkedIn**|[Design Learned Web Search Ranking](https://www.fastprep.io/system-design/learned-web-search-ranking)|System design|[![Practice][p]](https://www.fastprep.io/system-design/learned-web-search-ranking)|๐Ÿ”ฅ Oct 29, 2026| |**Amazon**|[Are Two People Relatives in a Family Tree?](https://www.fastprep.io/problems/amazon-family-tree-relatives)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-family-tree-relatives)|๐Ÿ”ฅ Oct 28, 2026| |**Apple**|[Design a Food Rating System](https://www.fastprep.io/problems/apple-food-rating-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-food-rating-system)|๐Ÿ”ฅ Oct 28, 2026| |**eBay**|[Count Staircases with Strictly Increasing Steps](https://www.fastprep.io/problems/ebay-count-distinct-height-staircases)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ebay-count-distinct-height-staircases)|๐Ÿ”ฅ Oct 28, 2026| |**eBay**|[Hierarchical Permission Check](https://www.fastprep.io/problems/ebay-hierarchical-permission-check)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ebay-hierarchical-permission-check)|๐Ÿ”ฅ Oct 28, 2026| |**eBay**|[Matrix Multiplication](https://www.fastprep.io/problems/ebay-matrix-multiplication)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ebay-matrix-multiplication)|๐Ÿ”ฅ Oct 28, 2026| |**Google**|[Meeting Rooms III: Most Booked Room](https://www.fastprep.io/problems/google-meeting-rooms-iii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-meeting-rooms-iii)|๐Ÿ”ฅ Oct 28, 2026| |**Google**|[Sum of Weighted Distances in a Tree](https://www.fastprep.io/problems/google-weighted-sum-of-distances-in-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-weighted-sum-of-distances-in-tree)|๐Ÿ”ฅ Oct 28, 2026| |**Helm.ai**|[Detect a Deadlock from Lock Logs](https://www.fastprep.io/problems/helm-ai-deadlock-detection-from-lock-logs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/helm-ai-deadlock-detection-from-lock-logs)|๐Ÿ”ฅ Oct 28, 2026| |**Lambda**|[Key-Value Store on a Block Device](https://www.fastprep.io/problems/lambda-block-device-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lambda-block-device-key-value-store)|๐Ÿ”ฅ Oct 28, 2026| |**NVIDIA**|[Summarize Server Healthcheck Logs](https://www.fastprep.io/problems/nvidia-server-healthcheck-log-summary)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-server-healthcheck-log-summary)|๐Ÿ”ฅ Oct 28, 2026| |**Palantir**|[Balanced Session Manager](https://www.fastprep.io/problems/palantir-balanced-session-manager)|Coding|[![Practice][p]](https://www.fastprep.io/problems/palantir-balanced-session-manager)|๐Ÿ”ฅ Oct 28, 2026| |**Pinterest**|[Gaussian Naive Bayes Classifier (Machine Learning OA)](https://www.fastprep.io/problems/pinterest-gaussian-naive-bayes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-gaussian-naive-bayes)|๐Ÿ”ฅ Oct 28, 2026| |**Reddit**|[Tennis Game and Set Scoring](https://www.fastprep.io/problems/reddit-tennis-set-scoring)|Coding|[![Practice][p]](https://www.fastprep.io/problems/reddit-tennis-set-scoring)|๐Ÿ”ฅ Oct 28, 2026| |**Google**|[Random Pick with Weight Using Recorded Draws](https://www.fastprep.io/problems/google-random-pick-with-weight-recorded-draws)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-random-pick-with-weight-recorded-draws)|๐Ÿ”ฅ Oct 28, 2026| |**Amazon**|[Best Improvement Period of at Least K Intervals](https://www.fastprep.io/problems/amazon-max-improvement-period-at-least-k)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-max-improvement-period-at-least-k)|๐Ÿ”ฅ Oct 28, 2026| |**Amazon**|[Search for an Element in a Stream](https://www.fastprep.io/problems/amazon-search-element-in-stream)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-search-element-in-stream)|๐Ÿ”ฅ Oct 28, 2026| |**Rippling / Google**|[Design a Personalized News Aggregation Platform](https://www.fastprep.io/system-design/personalized-news-aggregation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/personalized-news-aggregation-platform)|๐Ÿ”ฅ Oct 28, 2026| |**Cursor / Amazon**|[Design a Versioned IDE Settings Sync System](https://www.fastprep.io/system-design/versioned-ide-settings-sync)|System design|[![Practice][p]](https://www.fastprep.io/system-design/versioned-ide-settings-sync)|๐Ÿ”ฅ Oct 28, 2026| |**Databricks**|[Design a Chat Application with Message and Thread Deletion](https://www.fastprep.io/system-design/chat-message-and-thread-deletion)|System design|[![Practice][p]](https://www.fastprep.io/system-design/chat-message-and-thread-deletion)|๐Ÿ”ฅ Oct 28, 2026| |**Amazon**|[Design a Fleet Software Deployment and Orchestration System](https://www.fastprep.io/system-design/fleet-software-deployment-orchestration)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fleet-software-deployment-orchestration)|๐Ÿ”ฅ Oct 28, 2026| |**Pinterest**|[Find Local Maxima in Sensor Data (Machine Learning OA)](https://www.fastprep.io/problems/pinterest-find-local-maxima)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-find-local-maxima)|๐Ÿ”ฅ Oct 28, 2026| |**Pinterest**|[Gradient Descent Linear Regression Predictions (Machine Learning OA)](https://www.fastprep.io/problems/pinterest-gradient-descent-linear-regression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-gradient-descent-linear-regression)|๐Ÿ”ฅ Oct 28, 2026| |**Google**|[Top-Rated Similar Movies](https://www.fastprep.io/problems/google-top-rated-similar-movies)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-top-rated-similar-movies)|๐Ÿ”ฅ Oct 28, 2026| |**Affirm**|[Cross-Day User Trust Scores](https://www.fastprep.io/problems/affirm-cross-day-user-trust-scores)|Coding|[![Practice][p]](https://www.fastprep.io/problems/affirm-cross-day-user-trust-scores)|๐Ÿ”ฅ Oct 28, 2026| |**OpenAI**|[Determine the Winner of Three-Card Hands](https://www.fastprep.io/problems/openai-three-card-hand-winner)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-three-card-hand-winner)|๐Ÿ”ฅ Oct 28, 2026| |**Amazon**|[Word Break](https://www.fastprep.io/problems/amazon-word-break)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-word-break)|๐Ÿ”ฅ Oct 28, 2026| |**Amazon**|[Sliding-Window Rate Limiter](https://www.fastprep.io/problems/amazon-sliding-window-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-sliding-window-rate-limiter)|๐Ÿ”ฅ Oct 28, 2026| |**Nooks**|[Majority Labels over Audio Intervals](https://www.fastprep.io/problems/nooks-majority-label-audio-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nooks-majority-label-audio-intervals)|๐Ÿ”ฅ Oct 28, 2026| |**Amazon**|[Fill One Exact-Length Binary Window](https://www.fastprep.io/problems/amazon-fill-exact-length-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-fill-exact-length-window)|๐Ÿ”ฅ Oct 27, 2026| |**Google**|[Fuel Route with Fewest Station Visits](https://www.fastprep.io/problems/google-fuel-route-fewest-stations-then-roads)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-fuel-route-fewest-stations-then-roads)|๐Ÿ”ฅ Oct 27, 2026| |**ByteDance**|[Sparse Matrix Multiplication](https://www.fastprep.io/problems/bytedance-sparse-matrix-multiplication)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-sparse-matrix-multiplication)|๐Ÿ”ฅ Oct 27, 2026| |**Waymo**|[Fixed-Order Task Run Time With Cooldown](https://www.fastprep.io/problems/waymo-fixed-order-task-run-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-fixed-order-task-run-time)|๐Ÿ”ฅ Oct 27, 2026| |**Waymo**|[Reorderable Task Scheduler With Cooldown](https://www.fastprep.io/problems/waymo-reorderable-task-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-reorderable-task-scheduler)|๐Ÿ”ฅ Oct 27, 2026| |**LinkedIn**|[Roll a Weighted Die](https://www.fastprep.io/problems/linkedin-weighted-die-roll)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-weighted-die-roll)|๐Ÿ”ฅ Oct 27, 2026| |**Oracle**|[Cache an Expensive Service Across Threads](https://www.fastprep.io/problems/oracle-concurrent-expensive-service-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-concurrent-expensive-service-cache)|๐Ÿ”ฅ Oct 27, 2026| |**Walleye Capital**|[Minimum Testers to Find the Poisoned Bottle](https://www.fastprep.io/problems/walleye-poison-bottle-minimum-testers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walleye-poison-bottle-minimum-testers)|๐Ÿ”ฅ Oct 27, 2026| |**Walleye Capital**|[Squared Frobenius Norm of a Reflect-and-Stretch Map](https://www.fastprep.io/problems/walleye-reflect-stretch-frobenius-norm)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walleye-reflect-stretch-frobenius-norm)|๐Ÿ”ฅ Oct 27, 2026| |**Walleye Capital**|[Posterior of a Poisson Rate After Observing a Total](https://www.fastprep.io/problems/walleye-gamma-poisson-posterior)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walleye-gamma-poisson-posterior)|๐Ÿ”ฅ Oct 27, 2026| |**Nextdoor**|[Build a File Tree from Streamed Records](https://www.fastprep.io/problems/nextdoor-streaming-file-system-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nextdoor-streaming-file-system-tree)|๐Ÿ”ฅ Oct 27, 2026| |**Mercor**|[Expected Fake-Name Collisions](https://www.fastprep.io/problems/mercor-fake-name-expected-collisions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-fake-name-expected-collisions)|๐Ÿ”ฅ Oct 27, 2026| |**Mercor**|[Precision of Stacked PII Detector Flags](https://www.fastprep.io/problems/mercor-pii-detector-flag-precision)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-pii-detector-flag-precision)|๐Ÿ”ฅ Oct 27, 2026| |**Mercor**|[Length of a Document Reached Through a Random Token](https://www.fastprep.io/problems/mercor-token-sampled-document-length)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-token-sampled-document-length)|๐Ÿ”ฅ Oct 27, 2026| |**Google**|[Finish Time of Fixed-Length CPU Tasks](https://www.fastprep.io/problems/google-fixed-length-cpu-tasks-finish-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-fixed-length-cpu-tasks-finish-time)|๐Ÿ”ฅ Oct 27, 2026| |**Google**|[Lowest-Bid Auction System](https://www.fastprep.io/problems/google-lowest-bid-auction-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-lowest-bid-auction-system)|๐Ÿ”ฅ Oct 27, 2026| |**Google**|[Minimum Product Path in a Directed Graph](https://www.fastprep.io/problems/google-minimum-product-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-minimum-product-path)|๐Ÿ”ฅ Oct 27, 2026| |**Google**|[Longest Duplicate Substring](https://www.fastprep.io/problems/google-longest-duplicate-substring)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-longest-duplicate-substring)|๐Ÿ”ฅ Oct 27, 2026| |**Goldman Sachs**|[Repair Event Pre-Save Validation](https://www.fastprep.io/project-coding/goldman-sachs-event-presave-validation)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/goldman-sachs-event-presave-validation)|๐Ÿ”ฅ Oct 27, 2026| |**Zscaler / Amazon / Walmart / Stripe / ByteDance / Bloomberg LP / OpenAI / New Relic / Datadog / WhatNot**|[Design a Global Service Metrics Monitoring and Alerting Platform](https://www.fastprep.io/system-design/global-service-metrics-monitoring-and-alerting)|System design|[![Practice][p]](https://www.fastprep.io/system-design/global-service-metrics-monitoring-and-alerting)|๐Ÿ”ฅ Oct 27, 2026| |**Commvault / Oracle**|[Design a Chess Move Validation Model](https://www.fastprep.io/low-level-design/chess-move-validation)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/chess-move-validation)|๐Ÿ”ฅ Oct 27, 2026| |**Nextdoor**|[Design a Neighborhood News Feed with Black-Box Ranking](https://www.fastprep.io/system-design/neighborhood-news-feed-with-black-box-ranking)|System design|[![Practice][p]](https://www.fastprep.io/system-design/neighborhood-news-feed-with-black-box-ranking)|๐Ÿ”ฅ Oct 27, 2026| |**Oracle**|[Design Safe Patching and Image Rollout for a Storage Fleet](https://www.fastprep.io/system-design/storage-fleet-patching-and-image-rollout)|System design|[![Practice][p]](https://www.fastprep.io/system-design/storage-fleet-patching-and-image-rollout)|๐Ÿ”ฅ Oct 27, 2026| |**Rippling**|[Stateful Log Transform and Search](https://www.fastprep.io/problems/rippling-stateful-log-transform-and-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-stateful-log-transform-and-search)|๐Ÿ”ฅ Oct 27, 2026| |**Stripe**|[Subscription and Usage-Based Billing Calculator](https://www.fastprep.io/problems/stripe-subscription-and-usage-billing-calculator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-subscription-and-usage-billing-calculator)|๐Ÿ”ฅ Oct 27, 2026| |**Affirm**|[Count Distinct Underwriting PII Values](https://www.fastprep.io/problems/affirm-count-distinct-underwriting-pii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/affirm-count-distinct-underwriting-pii)|๐Ÿ”ฅ Oct 27, 2026| |**Affirm**|[Propagating Fraud Detector](https://www.fastprep.io/problems/affirm-propagating-fraud-detector)|Coding|[![Practice][p]](https://www.fastprep.io/problems/affirm-propagating-fraud-detector)|๐Ÿ”ฅ Oct 27, 2026| |**Lyft**|[Minimum Window Substring](https://www.fastprep.io/problems/lyft-minimum-window-substring)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lyft-minimum-window-substring)|๐Ÿ”ฅ Oct 27, 2026| |**Anthropic**|[Crawl Same-Hostname URLs Concurrently](https://www.fastprep.io/problems/anthropic-same-hostname-concurrent-web-crawler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-same-hostname-concurrent-web-crawler)|๐Ÿ”ฅ Oct 27, 2026| |**WhatNot**|[User Journey Paths](https://www.fastprep.io/problems/whatnot-user-journey-paths)|Coding|[![Practice][p]](https://www.fastprep.io/problems/whatnot-user-journey-paths)|๐Ÿ”ฅ Oct 27, 2026| |**Amazon**|[Design File-System Search with Symlink Safety](https://www.fastprep.io/low-level-design/filesystem-search-with-symlink-safety)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/filesystem-search-with-symlink-safety)|๐Ÿ”ฅ Oct 27, 2026| |**Amazon**|[Design a Marketplace Product Review System](https://www.fastprep.io/system-design/marketplace-product-review-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/marketplace-product-review-system)|๐Ÿ”ฅ Oct 27, 2026| |**Amazon**|[First Unique Character in a Stream](https://www.fastprep.io/problems/amazon-first-unique-character-stream)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-first-unique-character-stream)|๐Ÿ”ฅ Oct 27, 2026| |**Amazon**|[Page Referrer Reachability](https://www.fastprep.io/problems/amazon-page-referrer-reachability)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-page-referrer-reachability)|๐Ÿ”ฅ Oct 27, 2026| |**Stripe**|[Transaction Fee Calculator โ€” Parts 1โ€“2: Basic Fee Calculation and Conditional Fee Rules](https://www.fastprep.io/problems/stripe-transaction-fee-calculator-part1)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-transaction-fee-calculator-part1)|๐Ÿ”ฅ Oct 27, 2026| |**Amazon**|[Longest Equal-Value Run](https://www.fastprep.io/problems/amazon-longest-equal-value-run)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-longest-equal-value-run)|๐Ÿ”ฅ Oct 26, 2026| |**The D.E. Shaw Group**|[Rearrange a String So No Neighbors Match](https://www.fastprep.io/problems/de-shaw-rearrange-string-adjacent-differ)|Coding|[![Practice][p]](https://www.fastprep.io/problems/de-shaw-rearrange-string-adjacent-differ)|๐Ÿ”ฅ Oct 26, 2026| |**The D.E. Shaw Group**|[Top K Largest Values from a Stream](https://www.fastprep.io/problems/de-shaw-top-k-largest-from-stream)|Coding|[![Practice][p]](https://www.fastprep.io/problems/de-shaw-top-k-largest-from-stream)|๐Ÿ”ฅ Oct 26, 2026| |**MongoDB**|[Build Packages as Dependencies Are Discovered](https://www.fastprep.io/problems/mongodb-incremental-build-dependencies)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mongodb-incremental-build-dependencies)|๐Ÿ”ฅ Oct 26, 2026| |**Pelatro**|[Records Created or Updated in a Time Window](https://www.fastprep.io/problems/pelatro-records-created-or-updated-in-window)|SQL|[![Practice][p]](https://www.fastprep.io/problems/pelatro-records-created-or-updated-in-window)|๐Ÿ”ฅ Oct 26, 2026| |**Pelatro**|[Same-Color Chessboard Positions](https://www.fastprep.io/problems/pelatro-same-color-chessboard-positions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pelatro-same-color-chessboard-positions)|๐Ÿ”ฅ Oct 26, 2026| |**Pelatro**|[Maximum Product of Three Integers](https://www.fastprep.io/problems/pelatro-maximum-product-of-three-integers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pelatro-maximum-product-of-three-integers)|๐Ÿ”ฅ Oct 26, 2026| |**Pelatro**|[Sort by Odd-Position Digit Sum](https://www.fastprep.io/problems/pelatro-sort-by-odd-position-digit-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pelatro-sort-by-odd-position-digit-sum)|๐Ÿ”ฅ Oct 26, 2026| |**Uber**|[Max Points on a Line](https://www.fastprep.io/problems/uber-max-points-on-a-line)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-max-points-on-a-line)|๐Ÿ”ฅ Oct 26, 2026| |**Uber**|[Online Meeting Scheduler with Fixed Rooms](https://www.fastprep.io/problems/uber-online-meeting-room-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-online-meeting-room-scheduler)|๐Ÿ”ฅ Oct 26, 2026| |**Birla Pivot**|[Bond Holders Above the Cash Flow Threshold](https://www.fastprep.io/problems/birla-pivot-bond-holder-total-cash-flow)|SQL|[![Practice][p]](https://www.fastprep.io/problems/birla-pivot-bond-holder-total-cash-flow)|๐Ÿ”ฅ Oct 26, 2026| |**Birla Pivot**|[Maximum Distinct Values After Unit Adjustments](https://www.fastprep.io/problems/birla-pivot-maximum-distinct-unit-adjustments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/birla-pivot-maximum-distinct-unit-adjustments)|๐Ÿ”ฅ Oct 26, 2026| |**Birla Pivot**|[Ordered-Pair Checksum Sum](https://www.fastprep.io/problems/birla-pivot-ordered-pair-checksum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/birla-pivot-ordered-pair-checksum)|๐Ÿ”ฅ Oct 26, 2026| |**Birla Pivot**|[Students and Their Subjects](https://www.fastprep.io/problems/birla-pivot-students-and-subjects)|SQL|[![Practice][p]](https://www.fastprep.io/problems/birla-pivot-students-and-subjects)|๐Ÿ”ฅ Oct 26, 2026| |**Amazon**|[Word Dictionary with Wildcard Find](https://www.fastprep.io/problems/amazon-wildcard-word-dictionary)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-wildcard-word-dictionary)|๐Ÿ”ฅ Oct 26, 2026| |**DocuSign / Walmart Labs / Alteryx**|[Design a Resilient E-Commerce Checkout](https://www.fastprep.io/system-design/resilient-ecommerce-checkout)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resilient-ecommerce-checkout)|๐Ÿ”ฅ Oct 26, 2026| |**Uber**|[Meal Delivery to Train Passengers](https://www.fastprep.io/system-design/train-station-meal-delivery)|System design|[![Practice][p]](https://www.fastprep.io/system-design/train-station-meal-delivery)|๐Ÿ”ฅ Oct 26, 2026| |**GoDaddy**|[Vehicle Violation Notifications](https://www.fastprep.io/system-design/vehicle-violation-notifications)|System design|[![Practice][p]](https://www.fastprep.io/system-design/vehicle-violation-notifications)|๐Ÿ”ฅ Oct 26, 2026| |**ClearTax / Tesco**|[Design a Railway Search and Booking Platform](https://www.fastprep.io/system-design/railway-search-and-booking-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/railway-search-and-booking-platform)|๐Ÿ”ฅ Oct 26, 2026| |**DoorDash**|[Build a Dasher Payout Service](https://www.fastprep.io/project-coding/doordash-dasher-payout-service)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/doordash-dasher-payout-service)|๐Ÿ”ฅ Oct 26, 2026| |**NVIDIA**|[Address on Same Page](https://www.fastprep.io/problems/nvidia-address-on-same-page)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-address-on-same-page)|๐Ÿ”ฅ Oct 26, 2026| |**Microsoft**|[Capacity to Ship Packages Within Days](https://www.fastprep.io/problems/microsoft-capacity-to-ship-packages-within-days)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-capacity-to-ship-packages-within-days)|๐Ÿ”ฅ Oct 26, 2026| |**Microsoft**|[Count Digit Replacements with No Equal Adjacent Digits](https://www.fastprep.io/problems/microsoft-count-digit-replacements-with-no-equal-adjacent-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-count-digit-replacements-with-no-equal-adjacent-digits)|๐Ÿ”ฅ Oct 26, 2026| |**JP Morgan Chase**|[Minimum Meeting Rooms](https://www.fastprep.io/problems/jpmorgan-minimum-meeting-rooms)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-minimum-meeting-rooms)|๐Ÿ”ฅ Oct 26, 2026| |**JP Morgan Chase**|[Find Total Cost](https://www.fastprep.io/problems/jpmorgan-find-total-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-find-total-cost)|๐Ÿ”ฅ Oct 26, 2026| |**NVIDIA**|[Maximum Score](https://www.fastprep.io/problems/nvidia-maximum-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-maximum-score)|๐Ÿ”ฅ Oct 26, 2026| |**Snowflake**|[Minimum N-ary Tree Depth Deletions](https://www.fastprep.io/problems/snowflake-minimum-nary-tree-deletions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-minimum-nary-tree-deletions)|๐Ÿ”ฅ Oct 26, 2026| |**Snowflake**|[Tree Height After Child Promotion](https://www.fastprep.io/problems/snowflake-tree-height-after-child-promotion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-tree-height-after-child-promotion)|๐Ÿ”ฅ Oct 26, 2026| |**Snowflake**|[Connect Four from the Last Move](https://www.fastprep.io/problems/snowflake-connect-four-last-move)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-connect-four-last-move)|๐Ÿ”ฅ Oct 26, 2026| |**Roblox**|[Implement a Rate Limiter](https://www.fastprep.io/problems/roblox-implement-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-implement-rate-limiter)|๐Ÿ”ฅ Oct 26, 2026| |**Roblox**|[Rate Limit by Multiple Request Fields](https://www.fastprep.io/problems/roblox-rate-limit-by-multiple-request-fields)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-rate-limit-by-multiple-request-fields)|๐Ÿ”ฅ Oct 26, 2026| |**Google / The D.E. Shaw Group**|[Design and Implement a Meeting-Room Scheduler](https://www.fastprep.io/low-level-design/meeting-room-scheduler)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/meeting-room-scheduler)|๐Ÿ”ฅ Oct 26, 2026| |**Amazon**|[Design a Train Ticket Booking Service](https://www.fastprep.io/low-level-design/train-ticket-booking-service)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/train-ticket-booking-service)|๐Ÿ”ฅ Oct 26, 2026| |**The D.E. Shaw Group**|[Design a Round-Based Tactical Shooter Match](https://www.fastprep.io/low-level-design/tactical-shooter-match-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/tactical-shooter-match-domain)|๐Ÿ”ฅ Oct 26, 2026| |**The D.E. Shaw Group**|[Design a Snakes and Ladders Game](https://www.fastprep.io/low-level-design/snakes-and-ladders-game)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/snakes-and-ladders-game)|๐Ÿ”ฅ Oct 26, 2026| |**Citadel**|[Reachable Transfer Positions](https://www.fastprep.io/problems/citadel-reachable-transfer-positions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/citadel-reachable-transfer-positions)|๐Ÿ”ฅ Oct 26, 2026| |**Uber**|[Earliest Time All Users Are Connected](https://www.fastprep.io/problems/uber-earliest-full-connection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-earliest-full-connection)|๐Ÿ”ฅ Oct 26, 2026| |**Capital One**|[Count Values Excluding the First Two](https://www.fastprep.io/problems/capital-one-count-values-excluding-first-two)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-count-values-excluding-first-two)|๐Ÿ”ฅ Oct 26, 2026| |**Rippling / Apple / Oracle / Confluent / Baseten**|[Design a Centralized Log Ingestion and Search Platform](https://www.fastprep.io/system-design/centralized-log-ingestion-and-search)|System design|[![Practice][p]](https://www.fastprep.io/system-design/centralized-log-ingestion-and-search)|๐Ÿ”ฅ Oct 26, 2026| |**Celebal Technologies**|[Second Largest Distinct Element](https://www.fastprep.io/problems/celebal-technologies-second-largest-distinct-element)|Coding|[![Practice][p]](https://www.fastprep.io/problems/celebal-technologies-second-largest-distinct-element)|๐Ÿ”ฅ Oct 25, 2026| |**ThoughtSpot / CARS24**|[Design a Priority-Aware Database Request Gateway](https://www.fastprep.io/system-design/priority-aware-database-request-gateway)|System design|[![Practice][p]](https://www.fastprep.io/system-design/priority-aware-database-request-gateway)|๐Ÿ”ฅ Oct 25, 2026| |**Sierra**|[Debug a Subscription Retention Agent](https://www.fastprep.io/project-coding/sierra-debug-subscription-retention-agent)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/sierra-debug-subscription-retention-agent)|๐Ÿ”ฅ Oct 25, 2026| |**Decagon**|[Design an AI Agent Rule Configuration Domain](https://www.fastprep.io/low-level-design/ai-agent-rule-configuration)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/ai-agent-rule-configuration)|๐Ÿ”ฅ Oct 25, 2026| |**Amazon**|[Course Schedule](https://www.fastprep.io/problems/amazon-course-schedule)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-course-schedule)|๐Ÿ”ฅ Oct 25, 2026| |**CARS24**|[Interleaving Strings](https://www.fastprep.io/problems/cars24-interleaving-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cars24-interleaving-string)|๐Ÿ”ฅ Oct 25, 2026| |**Nielsen**|[Perfect Squares Matching a Pattern](https://www.fastprep.io/problems/nielsen-pattern-matching-perfect-squares)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nielsen-pattern-matching-perfect-squares)|๐Ÿ”ฅ Oct 25, 2026| |**Nielsen**|[Preorder of a Special Binary Tree](https://www.fastprep.io/problems/nielsen-special-bst-preorder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nielsen-special-bst-preorder)|๐Ÿ”ฅ Oct 25, 2026| |**NVIDIA**|[Minimize Task Resource Consumption](https://www.fastprep.io/problems/nvidia-minimize-task-resource-consumption)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-minimize-task-resource-consumption)|๐Ÿ”ฅ Oct 25, 2026| |**NVIDIA**|[Minimum Project Bid Cost](https://www.fastprep.io/problems/nvidia-minimum-project-bid-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-minimum-project-bid-cost)|๐Ÿ”ฅ Oct 25, 2026| |**Kotak Mahindra Bank / Zomato / Eternal**|[Design a Food Delivery Order Domain](https://www.fastprep.io/low-level-design/food-delivery-order-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/food-delivery-order-domain)|๐Ÿ”ฅ Oct 24, 2026| |**Amazon**|[Design a Smart Meter Electricity Monitoring System](https://www.fastprep.io/system-design/smart-meter-electricity-monitoring)|System design|[![Practice][p]](https://www.fastprep.io/system-design/smart-meter-electricity-monitoring)|๐Ÿ”ฅ Oct 24, 2026| |**Amazon**|[Design an Agentic Chatbot Domain](https://www.fastprep.io/low-level-design/agentic-chatbot-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/agentic-chatbot-domain)|๐Ÿ”ฅ Oct 24, 2026| |**Amazon / Nike, Inc.**|[Design a Scheduled Examination Platform](https://www.fastprep.io/system-design/scheduled-examination-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/scheduled-examination-platform)|๐Ÿ”ฅ Oct 24, 2026| |**Rubrik**|[Design a Distributed Unique-ID Service](https://www.fastprep.io/system-design/distributed-unique-id-generation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-unique-id-generation)|๐Ÿ”ฅ Oct 24, 2026| |**Amazon / Airwallex / Apple / Wex / Confluent / Oracle / Motive / Grab / Optiver / Scale AI / ByteDance / Navi / Meta / Yellow.ai / Morgan Stanley**|[Design a Ticket Booking System](https://www.fastprep.io/system-design/ticket-booking-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ticket-booking-system)|๐Ÿ”ฅ Oct 24, 2026| |**Walmart / CARS24**|[Design a Marketplace Product Catalog Platform](https://www.fastprep.io/system-design/marketplace-product-catalog-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/marketplace-product-catalog-platform)|๐Ÿ”ฅ Oct 24, 2026| |**Yellow.ai**|[Design a Conference Room Booking System](https://www.fastprep.io/system-design/conference-room-booking-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/conference-room-booking-system)|๐Ÿ”ฅ Oct 24, 2026| |**CARS24**|[Design a Regional Lead Allocation System](https://www.fastprep.io/system-design/regional-lead-allocation-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/regional-lead-allocation-system)|๐Ÿ”ฅ Oct 24, 2026| |**Amazon / Postman / Mintlify / Walmart / Vercel / Figma / Otter.ai / Atlassian / Compass International Holdings / Better.com / Coinbase / Wayfair / WhatNot**|[Design a Collaborative Document Editor](https://www.fastprep.io/system-design/collaborative-document-editor)|System design|[![Practice][p]](https://www.fastprep.io/system-design/collaborative-document-editor)|๐Ÿ”ฅ Oct 24, 2026| |**Amazon**|[Reorganize a String](https://www.fastprep.io/problems/amazon-reorganize-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-reorganize-string)|๐Ÿ”ฅ Oct 24, 2026| |**CARS24**|[Daily Temperatures](https://www.fastprep.io/problems/cars24-daily-temperatures)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cars24-daily-temperatures)|๐Ÿ”ฅ Oct 24, 2026| |**CARS24**|[LRU Cache Operation Sequence](https://www.fastprep.io/problems/cars24-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cars24-lru-cache)|๐Ÿ”ฅ Oct 24, 2026| |**Morgan Stanley**|[Unique Grid Paths](https://www.fastprep.io/problems/morgan-stanley-unique-grid-paths)|Coding|[![Practice][p]](https://www.fastprep.io/problems/morgan-stanley-unique-grid-paths)|๐Ÿ”ฅ Oct 24, 2026| |**Nike, Inc.**|[Flatten a Mixed JSON List](https://www.fastprep.io/problems/nike-flatten-mixed-json-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nike-flatten-mixed-json-list)|๐Ÿ”ฅ Oct 24, 2026| |**Nike, Inc.**|[Hash Map with TTL](https://www.fastprep.io/problems/nike-hashmap-with-ttl)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nike-hashmap-with-ttl)|๐Ÿ”ฅ Oct 24, 2026| |**Nike, Inc.**|[Spiral Matrix](https://www.fastprep.io/problems/nike-spiral-matrix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nike-spiral-matrix)|๐Ÿ”ฅ Oct 24, 2026| |**Rubrik**|[Insert into a Left-Complete Binary Tree](https://www.fastprep.io/problems/rubrik-left-complete-binary-tree-insertion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rubrik-left-complete-binary-tree-insertion)|๐Ÿ”ฅ Oct 24, 2026| |**Rubrik**|[Thread-Safe Request Counts by Attribute](https://www.fastprep.io/problems/rubrik-thread-safe-windowed-attribute-request-counter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rubrik-thread-safe-windowed-attribute-request-counter)|๐Ÿ”ฅ Oct 24, 2026| |**Straive**|[Maximum Subarray Sum](https://www.fastprep.io/problems/straive-maximum-subarray)|Coding|[![Practice][p]](https://www.fastprep.io/problems/straive-maximum-subarray)|๐Ÿ”ฅ Oct 24, 2026| |**Yellow.ai**|[Count Groups of Diseased Plants](https://www.fastprep.io/problems/yellow-ai-diseased-plant-groups)|Coding|[![Practice][p]](https://www.fastprep.io/problems/yellow-ai-diseased-plant-groups)|๐Ÿ”ฅ Oct 24, 2026| |**Yellow.ai**|[Maximum Later Checkpoint Altitude Gain](https://www.fastprep.io/problems/yellow-ai-maximum-altitude-gain)|Coding|[![Practice][p]](https://www.fastprep.io/problems/yellow-ai-maximum-altitude-gain)|๐Ÿ”ฅ Oct 24, 2026| |**Straive**|[Department Employee Counts and Running Total](https://www.fastprep.io/problems/straive-department-employee-running-counts)|SQL|[![Practice][p]](https://www.fastprep.io/problems/straive-department-employee-running-counts)|๐Ÿ”ฅ Oct 24, 2026| |**Stripe**|[Business Account KYC Verification โ€” Parts 1โ€“5](https://www.fastprep.io/problems/stripe-kyc-business-verification)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-kyc-business-verification)|๐Ÿ”ฅ Oct 24, 2026| |**Mercor / Salesforce / Nuro / Rippling / Qualified Health AI / Solytics Partners**|[Design a Durable Work Orchestration Platform](https://www.fastprep.io/system-design/durable-work-orchestration-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/durable-work-orchestration-platform)|๐Ÿ”ฅ Oct 23, 2026| |**Careem / Cohesity / NVIDIA / LinkedIn**|[Design a Highly Available Distributed Key-Value Store](https://www.fastprep.io/system-design/highly-available-distributed-key-value-store)|System design|[![Practice][p]](https://www.fastprep.io/system-design/highly-available-distributed-key-value-store)|๐Ÿ”ฅ Oct 23, 2026| |**Oracle / Retell AI / Apple / Google / Walmart / Flipkart / Globalization Partners / Amazon / Reddit / Atlassian / Snowflake / Tennr / Teradata / Securonix / slice / Decagon**|[Design a Distributed Rate Limiter](https://www.fastprep.io/system-design/distributed-rate-limiter)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-rate-limiter)|๐Ÿ”ฅ Oct 23, 2026| |**LinkedIn**|[Design Sliding-Window Exception Rankings](https://www.fastprep.io/system-design/sliding-window-exception-rankings)|System design|[![Practice][p]](https://www.fastprep.io/system-design/sliding-window-exception-rankings)|๐Ÿ”ฅ Oct 23, 2026| |**TikTok**|[Check Array Arithmetic Expressions](https://www.fastprep.io/problems/tiktok-check-array-arithmetic-expressions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-check-array-arithmetic-expressions)|๐Ÿ”ฅ Oct 23, 2026| |**TikTok**|[Wait Until the Next Shuttle](https://www.fastprep.io/problems/tiktok-next-shuttle-wait-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-next-shuttle-wait-time)|๐Ÿ”ฅ Oct 23, 2026| |**FamPay / Atlassian**|[Design and Implement a Per-User Rate Limiter](https://www.fastprep.io/low-level-design/per-user-rate-limiter-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/per-user-rate-limiter-domain)|๐Ÿ”ฅ Oct 23, 2026| |**Angel One**|[Design a Price-Triggered Limit Order Domain](https://www.fastprep.io/low-level-design/price-triggered-limit-order-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/price-triggered-limit-order-domain)|๐Ÿ”ฅ Oct 23, 2026| |**Anthropic**|[Optimize a Simulated Accelerator Kernel](https://www.fastprep.io/project-coding/anthropic-simulated-accelerator-kernel-optimization)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/anthropic-simulated-accelerator-kernel-optimization)|๐Ÿ”ฅ Oct 22, 2026| |**Amazon**|[Customer Support Chat Platform](https://www.fastprep.io/system-design/customer-support-chat-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/customer-support-chat-platform)|๐Ÿ”ฅ Oct 22, 2026| |**Shopify**|[Design and Implement Car Rental Reservations](https://www.fastprep.io/low-level-design/car-rental-reservations)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/car-rental-reservations)|๐Ÿ”ฅ Oct 22, 2026| |**DoorDash / Robinhood / Snowflake / Postman / Figma / LinkedIn / Airbnb / Nextdoor / Decagon / Amazon / Cursor / Temporal / Sumo Logic / Zip / HyperVerge / NVIDIA**|[Design a Scheduled Job Execution System](https://www.fastprep.io/system-design/scheduled-job-execution-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/scheduled-job-execution-system)|๐Ÿ”ฅ Oct 22, 2026| |**Amazon / Omnissa / Deloitte**|[Design an Extensible Multi-Channel Alerting Platform](https://www.fastprep.io/low-level-design/extensible-multi-channel-alerting-platform)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/extensible-multi-channel-alerting-platform)|๐Ÿ”ฅ Oct 22, 2026| |**Keka HR**|[Build an Alert Ingestion Service](https://www.fastprep.io/project-coding/keka-mini-alerting-service)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/keka-mini-alerting-service)|๐Ÿ”ฅ Oct 22, 2026| |**Keka HR**|[Design an Admin Trip Assignment System](https://www.fastprep.io/system-design/admin-trip-driver-assignment-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/admin-trip-driver-assignment-system)|๐Ÿ”ฅ Oct 22, 2026| |**Keka HR**|[Review a Backend Search Endpoint](https://www.fastprep.io/project-coding/keka-secure-backend-code-review)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/keka-secure-backend-code-review)|๐Ÿ”ฅ Oct 22, 2026| |**Scale AI**|[Lowest Common Ancestor in a General Tree](https://www.fastprep.io/problems/scale-ai-lowest-common-ancestor-general-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/scale-ai-lowest-common-ancestor-general-tree)|๐Ÿ”ฅ Oct 22, 2026| |**NVIDIA**|[Count Ideal Numbers in a Range](https://www.fastprep.io/problems/nvidia-count-ideal-numbers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-count-ideal-numbers)|๐Ÿ”ฅ Oct 22, 2026| |**NVIDIA**|[Generate Bit Mask](https://www.fastprep.io/problems/nvidia-generate-bit-mask)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-generate-bit-mask)|๐Ÿ”ฅ Oct 22, 2026| |**NVIDIA**|[Reconstruct an Array from Prefix XOR](https://www.fastprep.io/problems/nvidia-reconstruct-array-from-prefix-xor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-reconstruct-array-from-prefix-xor)|๐Ÿ”ฅ Oct 22, 2026| |**NVIDIA**|[Sum of Subarray Minimums](https://www.fastprep.io/problems/nvidia-sum-of-subarray-minimums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-sum-of-subarray-minimums)|๐Ÿ”ฅ Oct 22, 2026| |**NVIDIA**|[Unique Integers That Sum to Zero](https://www.fastprep.io/problems/nvidia-unique-integers-summing-to-zero)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-unique-integers-summing-to-zero)|๐Ÿ”ฅ Oct 22, 2026| |**Scale AI**|[Build Sessions from Unordered Events (Part 1)](https://www.fastprep.io/problems/scale-ai-build-sessions-from-events)|Coding|[![Practice][p]](https://www.fastprep.io/problems/scale-ai-build-sessions-from-events)|๐Ÿ”ฅ Oct 22, 2026| |**Scale AI**|[Match Billing Charges to User Sessions (Part 2)](https://www.fastprep.io/problems/scale-ai-reconcile-session-billing-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/scale-ai-reconcile-session-billing-ledger)|๐Ÿ”ฅ Oct 22, 2026| |**LinkedIn**|[Inverse-Depth Nested List Sum](https://www.fastprep.io/problems/linkedin-nested-list-weight-sum-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-nested-list-weight-sum-ii)|๐Ÿ”ฅ Oct 22, 2026| |**Amazon**|[Search a Row and Column Sorted Matrix](https://www.fastprep.io/problems/amazon-search-row-column-sorted-matrix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-search-row-column-sorted-matrix)|๐Ÿ”ฅ Oct 22, 2026| |**Google**|[Maximum Subarray Endpoint Score](https://www.fastprep.io/problems/google-maximum-subarray-endpoint-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-maximum-subarray-endpoint-score)|๐Ÿ”ฅ Oct 22, 2026| |**LinkedIn**|[Valid Number with Exponents](https://www.fastprep.io/problems/linkedin-valid-number-with-exponents)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-valid-number-with-exponents)|๐Ÿ”ฅ Oct 22, 2026| |**Confluent**|[Design a Podcast Subscription Feed API and Data Model](https://www.fastprep.io/system-design/podcast-subscription-feed-api-data-model)|System design|[![Practice][p]](https://www.fastprep.io/system-design/podcast-subscription-feed-api-data-model)|๐Ÿ”ฅ Oct 21, 2026| |**Amazon / OpenAI / Anthropic / eBay**|[Design a Large-Model Inference Serving Platform](https://www.fastprep.io/system-design/large-model-inference-serving-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/large-model-inference-serving-platform)|๐Ÿ”ฅ Oct 21, 2026| |**Confluent / Oracle**|[Design a Durable Disposable Email Service](https://www.fastprep.io/system-design/durable-disposable-email-username-registry)|System design|[![Practice][p]](https://www.fastprep.io/system-design/durable-disposable-email-username-registry)|๐Ÿ”ฅ Oct 21, 2026| |**Amazon**|[Design a Pizza Ordering Domain](https://www.fastprep.io/low-level-design/pizza-order-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/pizza-order-domain)|๐Ÿ”ฅ Oct 21, 2026| |**eBay**|[Design a Multi-Tenant Model Registry and Sharing Platform](https://www.fastprep.io/system-design/multi-tenant-model-registry-and-sharing-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multi-tenant-model-registry-and-sharing-platform)|๐Ÿ”ฅ Oct 21, 2026| |**Amazon**|[Design a Prescription Eyewear Ordering Platform](https://www.fastprep.io/system-design/prescription-eyewear-ordering-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/prescription-eyewear-ordering-platform)|๐Ÿ”ฅ Oct 21, 2026| |**Proofpoint**|[Design a Concurrent Sports Roster Service](https://www.fastprep.io/low-level-design/concurrent-sports-roster-service)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/concurrent-sports-roster-service)|๐Ÿ”ฅ Oct 21, 2026| |**Pinterest**|[Decision Tree Classifier from Scratch (Machine Learning OA)](https://www.fastprep.io/problems/pinterest-decision-tree-classifier)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-decision-tree-classifier)|๐Ÿ”ฅ Oct 21, 2026| |**Google**|[First-Fit Memory Allocator](https://www.fastprep.io/problems/google-first-fit-memory-allocator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-first-fit-memory-allocator)|๐Ÿ”ฅ Oct 21, 2026| |**Amazon**|[Repair My Cars Ownership and Saved Edits](https://www.fastprep.io/project-coding/amazon-car-rental-listing-repair)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/amazon-car-rental-listing-repair)|๐Ÿ”ฅ Oct 21, 2026| |**Amazon**|[Maximize Shipment Order by Sorting One Window](https://www.fastprep.io/problems/amazon-maximize-shipment-order-one-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximize-shipment-order-one-window)|๐Ÿ”ฅ Oct 21, 2026| |**McKinsey & Company**|[Count Repeated Request IDs (Data Science OA)](https://www.fastprep.io/problems/mckinsey-count-repeated-request-ids)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mckinsey-count-repeated-request-ids)|๐Ÿ”ฅ Oct 21, 2026| |**McKinsey & Company**|[Minimize Adjacent Squared-Difference Cost with One Insertion](https://www.fastprep.io/problems/mckinsey-minimum-adjacent-square-cost-after-insertion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mckinsey-minimum-adjacent-square-cost-after-insertion)|๐Ÿ”ฅ Oct 21, 2026| |**Pinterest / Slack / Motive**|[Design a Typeahead Suggestion Service](https://www.fastprep.io/system-design/typeahead-suggestion-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/typeahead-suggestion-service)|๐Ÿ”ฅ Oct 21, 2026| |**Pinterest / Apple**|[Design a Real-Time Category Leaderboard](https://www.fastprep.io/system-design/real-time-category-leaderboard)|System design|[![Practice][p]](https://www.fastprep.io/system-design/real-time-category-leaderboard)|๐Ÿ”ฅ Oct 21, 2026| |**Syfe / Google**|[Design A Token-Limited Multi-Profile Chat](https://www.fastprep.io/system-design/token-limited-multi-profile-chat)|System design|[![Practice][p]](https://www.fastprep.io/system-design/token-limited-multi-profile-chat)|๐Ÿ”ฅ Oct 21, 2026| |**Okta**|[Design a Device Status Collection Platform](https://www.fastprep.io/system-design/device-status-collection-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/device-status-collection-platform)|๐Ÿ”ฅ Oct 21, 2026| |**Zoox**|[Design Accurate Video View Counts](https://www.fastprep.io/system-design/video-view-count-analytics)|System design|[![Practice][p]](https://www.fastprep.io/system-design/video-view-count-analytics)|๐Ÿ”ฅ Oct 21, 2026| |**Okta**|[Implement a JWT Parser](https://www.fastprep.io/project-coding/okta-jwt-parser)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/okta-jwt-parser)|๐Ÿ”ฅ Oct 21, 2026| |**Anthropic**|[Implement a Stock-Price Agent Loop](https://www.fastprep.io/project-coding/anthropic-stock-price-agent-loop)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/anthropic-stock-price-agent-loop)|๐Ÿ”ฅ Oct 21, 2026| |**Stripe**|[Complete a Bikemap Route and JSON Integration](https://www.fastprep.io/project-coding/stripe-bikemap-json-integration)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/stripe-bikemap-json-integration)|๐Ÿ”ฅ Oct 21, 2026| |**Google**|[LRU Cache Operation Sequence](https://www.fastprep.io/problems/google-lru-cache-operation-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-lru-cache-operation-sequence)|๐Ÿ”ฅ Oct 21, 2026| |**Stripe**|[Repair Nested Record Value Normalization](https://www.fastprep.io/project-coding/stripe-nested-value-normalization)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/stripe-nested-value-normalization)|๐Ÿ”ฅ Oct 21, 2026| |**Stripe**|[Transaction Rule Expression Evaluator](https://www.fastprep.io/problems/stripe-transaction-rule-expression-evaluator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-transaction-rule-expression-evaluator)|๐Ÿ”ฅ Oct 21, 2026| |**Stripe**|[Invoice / Payment Reconciliation](https://www.fastprep.io/problems/stripe-invoice-payment-reconciliation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-invoice-payment-reconciliation)|๐Ÿ”ฅ Oct 21, 2026| |**Google**|[Robot Assembly Line Conflicts](https://www.fastprep.io/problems/google-robot-assembly-line-conflicts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-robot-assembly-line-conflicts)|๐Ÿ”ฅ Oct 20, 2026| |**Amazon**|[Climbing Stairs](https://www.fastprep.io/problems/amazon-climbing-stairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-climbing-stairs)|๐Ÿ”ฅ Oct 20, 2026| |**Google**|[Periodic-Color Binary Forest Roots](https://www.fastprep.io/problems/google-periodic-color-binary-forest-roots)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-periodic-color-binary-forest-roots)|๐Ÿ”ฅ Oct 20, 2026| |**Dell Technologies**|[Departments Without Employees](https://www.fastprep.io/problems/dell-departments-without-employees)|SQL|[![Practice][p]](https://www.fastprep.io/problems/dell-departments-without-employees)|๐Ÿ”ฅ Oct 20, 2026| |**Dell Technologies**|[Find All Pythagorean Triplets](https://www.fastprep.io/problems/dell-pythagorean-triplets)|Coding|[![Practice][p]](https://www.fastprep.io/problems/dell-pythagorean-triplets)|๐Ÿ”ฅ Oct 20, 2026| |**Dell Technologies**|[First Non-Repeated Character](https://www.fastprep.io/problems/dell-first-non-repeated-character)|Coding|[![Practice][p]](https://www.fastprep.io/problems/dell-first-non-repeated-character)|๐Ÿ”ฅ Oct 20, 2026| |**Qualys**|[Find the Entry of a Linked-List Cycle](https://www.fastprep.io/problems/qualys-linked-list-cycle-entry)|Coding|[![Practice][p]](https://www.fastprep.io/problems/qualys-linked-list-cycle-entry)|๐Ÿ”ฅ Oct 20, 2026| |**Qualys**|[Valid Parentheses](https://www.fastprep.io/problems/qualys-valid-parentheses)|Coding|[![Practice][p]](https://www.fastprep.io/problems/qualys-valid-parentheses)|๐Ÿ”ฅ Oct 20, 2026| |**Qualys**|[Rotate an Array Right by K Steps](https://www.fastprep.io/problems/qualys-rotate-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/qualys-rotate-array)|๐Ÿ”ฅ Oct 20, 2026| |**Qualys**|[Delete a Doubly Linked-List Node at a Position](https://www.fastprep.io/problems/qualys-doubly-linked-list-delete-at-position)|Coding|[![Practice][p]](https://www.fastprep.io/problems/qualys-doubly-linked-list-delete-at-position)|๐Ÿ”ฅ Oct 20, 2026| |**Qualys**|[Insert a Doubly Linked-List Node at a Position](https://www.fastprep.io/problems/qualys-doubly-linked-list-insert-at-position)|Coding|[![Practice][p]](https://www.fastprep.io/problems/qualys-doubly-linked-list-insert-at-position)|๐Ÿ”ฅ Oct 20, 2026| |**Qualys**|[Implement Binary Search](https://www.fastprep.io/problems/qualys-binary-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/qualys-binary-search)|๐Ÿ”ฅ Oct 20, 2026| |**Stripe**|[Colander Debugging: Repair Error Aggregation](https://www.fastprep.io/project-coding/mock-stripe-colander-aggregation)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/mock-stripe-colander-aggregation)|๐Ÿ”ฅ Oct 20, 2026| |**Amazon**|[Aggressive Cows](https://www.fastprep.io/problems/amazon-aggressive-cows)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-aggressive-cows)|๐Ÿ”ฅ Oct 20, 2026| |**Amazon**|[Course Schedule II](https://www.fastprep.io/problems/amazon-course-schedule-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-course-schedule-ii)|๐Ÿ”ฅ Oct 20, 2026| |**Amazon / Instacart / Zip / Nykaa / Flipkart**|[Design a Last-Unit Inventory Reservation Service](https://www.fastprep.io/system-design/last-unit-inventory-reservation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/last-unit-inventory-reservation)|๐Ÿ”ฅ Oct 20, 2026| |**Microsoft**|[Maximize Pipeline Throughput Under a Scaling Budget](https://www.fastprep.io/problems/microsoft-maximize-pipeline-throughput-under-budget)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-maximize-pipeline-throughput-under-budget)|๐Ÿ”ฅ Oct 20, 2026| |**Microsoft**|[Minimum Cost K-Capable Models](https://www.fastprep.io/problems/microsoft-minimum-cost-k-capable-models)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-minimum-cost-k-capable-models)|๐Ÿ”ฅ Oct 20, 2026| |**TikTok**|[Longest Substring Without Repeating Characters](https://www.fastprep.io/problems/tiktok-longest-substring-without-repeating-characters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-longest-substring-without-repeating-characters)|๐Ÿ”ฅ Oct 20, 2026| |**TikTok**|[Next Greater Indices and Maximum Gap](https://www.fastprep.io/problems/tiktok-next-greater-elements-and-gap)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-next-greater-elements-and-gap)|๐Ÿ”ฅ Oct 20, 2026| |**Chubb**|[Minimize the Maximum Array Element](https://www.fastprep.io/problems/chubb-minimize-maximum-array-element)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-minimize-maximum-array-element)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Maximize Revenue from Selling Items](https://www.fastprep.io/problems/chubb-maximize-revenue-from-selling-items)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-maximize-revenue-from-selling-items)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Minimize the Sum of Prefix Costs](https://www.fastprep.io/problems/chubb-minimum-distinct-prefix-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-minimum-distinct-prefix-cost)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Count Valid Pairs](https://www.fastprep.io/problems/chubb-count-valid-divisible-interval-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-count-valid-divisible-interval-pairs)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Maximum Element After Rotations](https://www.fastprep.io/problems/chubb-max-element-indexes-after-rotations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-max-element-indexes-after-rotations)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Second-Highest Salary](https://www.fastprep.io/problems/chubb-second-highest-salary)|SQL|[![Practice][p]](https://www.fastprep.io/problems/chubb-second-highest-salary)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Reverse a Linked List](https://www.fastprep.io/problems/chubb-reverse-linked-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-reverse-linked-list)|๐Ÿ”ฅ Oct 19, 2026| |**Chubb**|[Unique Element Among Pairs](https://www.fastprep.io/problems/chubb-unique-element-among-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-unique-element-among-pairs)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Declarative Cluster Control Plane](https://www.fastprep.io/system-design/declarative-cluster-control-plane)|System design|[![Practice][p]](https://www.fastprep.io/system-design/declarative-cluster-control-plane)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Design a Resilient Third-Party Token Client](https://www.fastprep.io/system-design/resilient-third-party-token-client)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resilient-third-party-token-client)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Design a Shared User Quota Authority](https://www.fastprep.io/system-design/shared-user-quota-authority)|System design|[![Practice][p]](https://www.fastprep.io/system-design/shared-user-quota-authority)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Design an Application Logging Client Library](https://www.fastprep.io/system-design/application-logging-client-library)|System design|[![Practice][p]](https://www.fastprep.io/system-design/application-logging-client-library)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Design an Auditable Event Trail Service](https://www.fastprep.io/system-design/auditable-event-trail-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/auditable-event-trail-service)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Fault-Tolerant Batch Dataflow Engine](https://www.fastprep.io/system-design/fault-tolerant-batch-dataflow-engine)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fault-tolerant-batch-dataflow-engine)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Resilient REST Call Abstraction](https://www.fastprep.io/system-design/resilient-rest-call-abstraction)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resilient-rest-call-abstraction)|๐Ÿ”ฅ Oct 19, 2026| |**Snowflake**|[Versioned Query-DAG Result Cache](https://www.fastprep.io/system-design/versioned-query-dag-result-cache)|System design|[![Practice][p]](https://www.fastprep.io/system-design/versioned-query-dag-result-cache)|๐Ÿ”ฅ Oct 19, 2026| |**OpenAI**|[Design a Fair Multiplayer Typing Race](https://www.fastprep.io/system-design/multiplayer-typing-race)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multiplayer-typing-race)|๐Ÿ”ฅ Oct 19, 2026| |**Stripe**|[Split Tender Payments with Expiration and Refunds](https://www.fastprep.io/problems/stripe-split-tender-payments-with-refunds)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-split-tender-payments-with-refunds)|๐Ÿ”ฅ Oct 19, 2026| |**ByteDance**|[Design a Currency Conversion Service](https://www.fastprep.io/system-design/currency-conversion-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/currency-conversion-service)|๐Ÿ”ฅ Oct 19, 2026| |**LinkedIn**|[Implement Priority and Time-Window Log Processing](https://www.fastprep.io/project-coding/linkedin-priority-window-log-processing)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/linkedin-priority-window-log-processing)|๐Ÿ”ฅ Oct 19, 2026| |**Amazon**|[Binary Tree Spiral Level Order](https://www.fastprep.io/problems/amazon-binary-tree-spiral-level-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-binary-tree-spiral-level-order)|๐Ÿ”ฅ Oct 18, 2026| |**Amazon**|[Number of Islands](https://www.fastprep.io/problems/amazon-number-of-islands)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-number-of-islands)|๐Ÿ”ฅ Oct 18, 2026| |**Unattributed**|[Design a Medicine Delivery Platform](https://www.fastprep.io/system-design/medicine-delivery-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/medicine-delivery-platform)|๐Ÿ”ฅ Oct 18, 2026| |**Amazon**|[Minimum Cost of Left and Right Propagation](https://www.fastprep.io/problems/amazon-minimum-left-right-propagation-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-left-right-propagation-cost)|๐Ÿ”ฅ Oct 18, 2026| |**Google**|[Dynamic Point-in-Range Queries](https://www.fastprep.io/problems/google-dynamic-point-range-coverage)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-dynamic-point-range-coverage)|๐Ÿ”ฅ Oct 18, 2026| |**Google**|[Biggest Number From Digits](https://www.fastprep.io/problems/google-biggest-number-from-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-biggest-number-from-digits)|๐Ÿ”ฅ Oct 18, 2026| |**Roblox**|[Schedule Meeting](https://www.fastprep.io/problems/roblox-schedule-meeting)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-schedule-meeting)|๐Ÿ”ฅ Oct 18, 2026| |**Roblox**|[Suffix Pairs](https://www.fastprep.io/problems/roblox-solution)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-solution)|๐Ÿ”ฅ Oct 18, 2026| |**Modular / Unity / Faire**|[Design a Machine Learning Feature Store](https://www.fastprep.io/system-design/machine-learning-feature-store)|System design|[![Practice][p]](https://www.fastprep.io/system-design/machine-learning-feature-store)|๐Ÿ”ฅ Oct 18, 2026| |**Lambda / Faire**|[Cloud AI Inference Platform](https://www.fastprep.io/system-design/cloud-ai-inference-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cloud-ai-inference-platform)|๐Ÿ”ฅ Oct 18, 2026| |**Keychain / Headlands Technologies / Anyscale**|[Design a Future-Time Job Scheduler](https://www.fastprep.io/system-design/future-time-job-scheduler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/future-time-job-scheduler)|๐Ÿ”ฅ Oct 18, 2026| |**Roblox / Coinbase / Faire**|[Design a Like/Unlike Service](https://www.fastprep.io/system-design/like-unlike-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/like-unlike-service)|๐Ÿ”ฅ Oct 18, 2026| |**Google**|[Assign Locker](https://www.fastprep.io/problems/google-assign-locker)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-assign-locker)|๐Ÿ”ฅ Oct 18, 2026| |**Agoda**|[Design a Flight Search and Booking Aggregator](https://www.fastprep.io/system-design/flight-search-booking-aggregation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/flight-search-booking-aggregation-platform)|๐Ÿ”ฅ Oct 17, 2026| |**Agoda**|[Design a Supplier Booking-Pull Platform](https://www.fastprep.io/system-design/supplier-booking-pull-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/supplier-booking-pull-platform)|๐Ÿ”ฅ Oct 17, 2026| |**Amazon**|[Design a Package Delivery Assignment Domain](https://www.fastprep.io/low-level-design/package-delivery-assignment-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/package-delivery-assignment-domain)|๐Ÿ”ฅ Oct 17, 2026| |**Agoda**|[Molecular Weight of a Grouped Formula](https://www.fastprep.io/problems/agoda-molecule-weight-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/agoda-molecule-weight-parser)|๐Ÿ”ฅ Oct 17, 2026| |**Agoda**|[Sort Ones, Twos, and Threes In Place](https://www.fastprep.io/problems/agoda-sort-ones-twos-threes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/agoda-sort-ones-twos-threes)|๐Ÿ”ฅ Oct 17, 2026| |**Amazon**|[Next Greater Element I](https://www.fastprep.io/problems/amazon-next-greater-element-i)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-next-greater-element-i)|๐Ÿ”ฅ Oct 17, 2026| |**Amazon**|[Search in a Rotated Sorted Array](https://www.fastprep.io/problems/amazon-search-rotated-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-search-rotated-sorted-array)|๐Ÿ”ฅ Oct 17, 2026| |**Google**|[Peak Task Concurrency Intervals](https://www.fastprep.io/problems/google-peak-task-concurrency-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-peak-task-concurrency-intervals)|๐Ÿ”ฅ Oct 17, 2026| |**Google**|[Find a Valid Course Completion Order](https://www.fastprep.io/problems/google-course-completion-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-course-completion-order)|๐Ÿ”ฅ Oct 17, 2026| |**Google**|[Count Filename Pairs Related by One Swap](https://www.fastprep.io/problems/google-one-swap-filename-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-one-swap-filename-pairs)|๐Ÿ”ฅ Oct 17, 2026| |**LinkedIn**|[Simulate Roller-Coaster Group Seating](https://www.fastprep.io/project-coding/linkedin-roller-coaster-group-seating)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/linkedin-roller-coaster-group-seating)|๐Ÿ”ฅ Oct 17, 2026| |**Airtable / Meta / Microsoft / LinkedIn**|[Design a Backend Search Engine](https://www.fastprep.io/system-design/backend-search-engine)|System design|[![Practice][p]](https://www.fastprep.io/system-design/backend-search-engine)|๐Ÿ”ฅ Oct 17, 2026| |**Amazon**|[Dijkstra Shortest Paths in a Weighted Undirected Graph](https://www.fastprep.io/problems/amazon-shortest-path-weighted-graph)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-shortest-path-weighted-graph)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[Find Word-Multiset Windows](https://www.fastprep.io/problems/amazon-word-multiset-window-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-word-multiset-window-search)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[LFU Cache](https://www.fastprep.io/problems/amazon-lfu-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-lfu-cache)|๐Ÿ”ฅ Oct 16, 2026| |**eBay**|[Gas Station](https://www.fastprep.io/problems/ebay-gas-station)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ebay-gas-station)|๐Ÿ”ฅ Oct 16, 2026| |**eBay**|[Onion-Peel Layers of a Binary Tree](https://www.fastprep.io/problems/ebay-onion-peel-tree-traversal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ebay-onion-peel-tree-traversal)|๐Ÿ”ฅ Oct 16, 2026| |**HackerRank**|[Classify Password Strength](https://www.fastprep.io/problems/hackerrank-password-strength-checker)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hackerrank-password-strength-checker)|๐Ÿ”ฅ Oct 16, 2026| |**Safe Security**|[Merge Intervals](https://www.fastprep.io/problems/safe-security-merge-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/safe-security-merge-intervals)|๐Ÿ”ฅ Oct 16, 2026| |**Pace Stock Broking Services**|[Minimum Cost for a Target Weight](https://www.fastprep.io/problems/pace-stock-minimum-power-of-two-weight-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pace-stock-minimum-power-of-two-weight-cost)|๐Ÿ”ฅ Oct 16, 2026| |**InMobi**|[Validate a Bracket Sequence](https://www.fastprep.io/problems/inmobi-valid-parentheses-stack)|Coding|[![Practice][p]](https://www.fastprep.io/problems/inmobi-valid-parentheses-stack)|๐Ÿ”ฅ Oct 16, 2026| |**Microsoft**|[Balance a Chemical Equation](https://www.fastprep.io/problems/microsoft-balance-chemical-equation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-balance-chemical-equation)|๐Ÿ”ฅ Oct 16, 2026| |**Microsoft**|[Minimum Changes for a Beautiful String](https://www.fastprep.io/problems/microsoft-minimum-beautiful-string-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-minimum-beautiful-string-operations)|๐Ÿ”ฅ Oct 16, 2026| |**Klaviyo**|[AI Engineer Intern Mock: Customer Message Classifier](https://www.fastprep.io/project-coding/mock-ai-intern-customer-message-classifier)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/mock-ai-intern-customer-message-classifier)|๐Ÿ”ฅ Oct 16, 2026| |**Klaviyo**|[AI Engineer Intern Mock: Explain and Extend Your AI Project](https://www.fastprep.io/system-design/mock-ai-intern-project-retrospective)|System design|[![Practice][p]](https://www.fastprep.io/system-design/mock-ai-intern-project-retrospective)|๐Ÿ”ฅ Oct 16, 2026| |**Klaviyo**|[AI Engineer Intern Mock: Repair a Classifier Cache](https://www.fastprep.io/project-coding/mock-ai-intern-classifier-cache)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/mock-ai-intern-classifier-cache)|๐Ÿ”ฅ Oct 16, 2026| |**Klaviyo**|[AI Engineer Intern Mock: Search Customer Messages](https://www.fastprep.io/project-coding/mock-ai-intern-customer-message-search)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/mock-ai-intern-customer-message-search)|๐Ÿ”ฅ Oct 16, 2026| |**Rippling**|[Comment Word and Substring Search](https://www.fastprep.io/problems/rippling-comment-word-and-substring-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-comment-word-and-substring-search)|๐Ÿ”ฅ Oct 16, 2026| |**OpenAI**|[Design a Cloud Coding Workspace](https://www.fastprep.io/system-design/cloud-coding-workspace)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cloud-coding-workspace)|๐Ÿ”ฅ Oct 16, 2026| |**DoorDash**|[Food Review System](https://www.fastprep.io/system-design/food-review-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/food-review-system)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon / Lyft / Google / Pinterest / Snowflake / Datadog**|[Design a Web Crawler](https://www.fastprep.io/system-design/web-crawler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/web-crawler)|๐Ÿ”ฅ Oct 16, 2026| |**Apple**|[Design a Distributed Cache with an Index Database](https://www.fastprep.io/system-design/distributed-cache-with-index-metadata)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-cache-with-index-metadata)|๐Ÿ”ฅ Oct 16, 2026| |**OpenAI**|[Durable Work Queue Operations](https://www.fastprep.io/problems/openai-durable-work-queue-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-durable-work-queue-operations)|๐Ÿ”ฅ Oct 16, 2026| |**DoorDash**|[Dasher Pay with Store Waits and Peak Hours](https://www.fastprep.io/problems/doordash-dasher-pay)|Coding|[![Practice][p]](https://www.fastprep.io/problems/doordash-dasher-pay)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Route Pattern Matcher](https://www.fastprep.io/problems/google-route-pattern-matcher)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-route-pattern-matcher)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[Dense Matrix Multiplication](https://www.fastprep.io/problems/amazon-dense-matrix-multiplication)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-dense-matrix-multiplication)|๐Ÿ”ฅ Oct 16, 2026| |**Apple**|[Count Nodes in a Chain](https://www.fastprep.io/problems/apple-count-chain-nodes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-count-chain-nodes)|๐Ÿ”ฅ Oct 16, 2026| |**Apple**|[Run-Length Decoding](https://www.fastprep.io/problems/apple-run-length-decoding)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-run-length-decoding)|๐Ÿ”ฅ Oct 16, 2026| |**Applied Intuition**|[File-Backed Dense Game of Life](https://www.fastprep.io/problems/applied-intuition-file-backed-dense-game-of-life)|Coding|[![Practice][p]](https://www.fastprep.io/problems/applied-intuition-file-backed-dense-game-of-life)|๐Ÿ”ฅ Oct 16, 2026| |**Cresta**|[Decode Words with Anagram Keys](https://www.fastprep.io/problems/cresta-anagram-message-decoding)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cresta-anagram-message-decoding)|๐Ÿ”ฅ Oct 16, 2026| |**Cresta**|[Find a File in a Directory Snapshot](https://www.fastprep.io/problems/cresta-filesystem-absolute-path-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cresta-filesystem-absolute-path-search)|๐Ÿ”ฅ Oct 16, 2026| |**Cresta**|[Maximum Suffixโ€“Prefix Overlap](https://www.fastprep.io/problems/cresta-maximum-suffix-prefix-overlap)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cresta-maximum-suffix-prefix-overlap)|๐Ÿ”ฅ Oct 16, 2026| |**Cresta**|[Leaves Remaining After Wind](https://www.fastprep.io/problems/cresta-wind-driven-leaf-grid)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cresta-wind-driven-leaf-grid)|๐Ÿ”ฅ Oct 16, 2026| |**LinkedIn**|[Randomized String Multiset](https://www.fastprep.io/problems/linkedin-randomized-string-multiset)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-randomized-string-multiset)|๐Ÿ”ฅ Oct 16, 2026| |**NVIDIA**|[Filter Paginated Medical Records](https://www.fastprep.io/problems/nvidia-paginated-medical-record-filter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-paginated-medical-record-filter)|๐Ÿ”ฅ Oct 16, 2026| |**Susquehanna International Group (SIG)**|[Finite Weighted Outcome Expectation](https://www.fastprep.io/problems/susquehanna-finite-weighted-outcome-expectation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-finite-weighted-outcome-expectation)|๐Ÿ”ฅ Oct 16, 2026| |**Susquehanna International Group (SIG)**|[Four-by-Four Boundary Grid](https://www.fastprep.io/problems/susquehanna-four-by-four-boundary-grid)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-four-by-four-boundary-grid)|๐Ÿ”ฅ Oct 16, 2026| |**Susquehanna International Group (SIG)**|[Three-Speaker Truth Consistency](https://www.fastprep.io/problems/susquehanna-three-speaker-truth-consistency)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-three-speaker-truth-consistency)|๐Ÿ”ฅ Oct 16, 2026| |**Postman / Uber Freight / LinkedIn / Safe Security**|[Design a Calendar Event Collaboration System](https://www.fastprep.io/system-design/calendar-event-collaboration-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/calendar-event-collaboration-system)|๐Ÿ”ฅ Oct 16, 2026| |**Broccoli AI**|[Design a Cross-Network Social Feed](https://www.fastprep.io/system-design/cross-platform-social-feed)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cross-platform-social-feed)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[Design a Vaccination Appointment Platform](https://www.fastprep.io/system-design/vaccination-appointment-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/vaccination-appointment-platform)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[Design a Delivery Slot Booking Domain](https://www.fastprep.io/low-level-design/delivery-slot-booking-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/delivery-slot-booking-domain)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[Top K Frequent Elements](https://www.fastprep.io/problems/amazon-top-k-frequent-elements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-top-k-frequent-elements)|๐Ÿ”ฅ Oct 16, 2026| |**Amazon**|[Lowest Common Ancestor in an N-ary Tree](https://www.fastprep.io/problems/amazon-nary-tree-lowest-common-ancestor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-nary-tree-lowest-common-ancestor)|๐Ÿ”ฅ Oct 16, 2026| |**Nykaa / Headway**|[Design a Cart-to-Order Inventory Platform](https://www.fastprep.io/system-design/cart-to-order-inventory-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cart-to-order-inventory-platform)|๐Ÿ”ฅ Oct 16, 2026| |**Flipkart**|[Implement a Distributed Task Scheduler](https://www.fastprep.io/project-coding/flipkart-distributed-task-scheduler)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/flipkart-distributed-task-scheduler)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Longest Alternating Subarray After One Deletion](https://www.fastprep.io/problems/google-longest-alternating-subarray-one-deletion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-longest-alternating-subarray-one-deletion)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Final File Paths After Sequential Moves](https://www.fastprep.io/problems/google-final-file-paths-after-moves)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-final-file-paths-after-moves)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Evaluate Sequential Variable Assignments](https://www.fastprep.io/problems/google-evaluate-sequential-variable-assignments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-evaluate-sequential-variable-assignments)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Course Schedule Cycle Detection](https://www.fastprep.io/problems/google-course-schedule-cycle-detection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-course-schedule-cycle-detection)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Make an Array Non-Decreasing With One Modification](https://www.fastprep.io/problems/google-non-decreasing-array-one-modification)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-non-decreasing-array-one-modification)|๐Ÿ”ฅ Oct 16, 2026| |**Google**|[Design a Pull-Based Server Metrics Monitor](https://www.fastprep.io/system-design/pull-based-server-metrics-monitoring)|System design|[![Practice][p]](https://www.fastprep.io/system-design/pull-based-server-metrics-monitoring)|๐Ÿ”ฅ Oct 16, 2026| |**Stripe**|[Integrate and Enrich Contact API Data](https://www.fastprep.io/project-coding/stripe-contact-api-enrichment)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/stripe-contact-api-enrichment)|๐Ÿ”ฅ Oct 16, 2026| |**Apple / OneTrust / Goldman Sachs**|[Design an Analytical Data Dashboard](https://www.fastprep.io/system-design/analytical-data-dashboard)|System design|[![Practice][p]](https://www.fastprep.io/system-design/analytical-data-dashboard)|๐Ÿ”ฅ Oct 16, 2026| |**NVIDIA**|[Design a Versioned Package Download Service](https://www.fastprep.io/system-design/versioned-package-download-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/versioned-package-download-service)|๐Ÿ”ฅ Oct 16, 2026| |**McKinsey & Company**|[Weekend Appointments for Consular Services Rescheduling](https://www.fastprep.io/problems/mckinsey-weekend-appointments)|SQL|[![Practice][p]](https://www.fastprep.io/problems/mckinsey-weekend-appointments)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Find Local Maxima in Sensor Data](https://www.fastprep.io/problems/tiktok-find-local-maxima)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-find-local-maxima)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Bagging Classifier with Supplied Decision Trees](https://www.fastprep.io/problems/tiktok-bagging-classifier)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-bagging-classifier)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Cosine k-Means Clustering](https://www.fastprep.io/problems/tiktok-cosine-k-means-clustering)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-cosine-k-means-clustering)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Count Eligible Package Codes](https://www.fastprep.io/problems/tiktok-count-eligible-package-codes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-eligible-package-codes)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Correct Sensor Readings](https://www.fastprep.io/problems/tiktok-correct-sensor-readings)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-correct-sensor-readings)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Bouncing Diagonal Weights](https://www.fastprep.io/problems/tiktok-bouncing-diagonal-weights)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-bouncing-diagonal-weights)|๐Ÿ†• Oct 15, 2026| |**TikTok**|[Arithmetic Triplets After Queries](https://www.fastprep.io/problems/tiktok-arithmetic-triplets-after-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-arithmetic-triplets-after-queries)|๐Ÿ†• Oct 15, 2026| |**Anthropic**|[Design a Gang-Scheduled GPU Inference Pool](https://www.fastprep.io/system-design/gang-scheduled-gpu-inference-pool)|System design|[![Practice][p]](https://www.fastprep.io/system-design/gang-scheduled-gpu-inference-pool)|๐Ÿ†• Oct 15, 2026| |**LinkedIn**|[Design a Personalized Recruiter Outreach Platform](https://www.fastprep.io/system-design/personalized-recruiter-outreach-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/personalized-recruiter-outreach-platform)|๐Ÿ†• Oct 15, 2026| |**Google / ByteDance**|[Design Fraud-Risk Scoring for Protected Actions](https://www.fastprep.io/system-design/fraud-risk-scoring-for-protected-actions)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fraud-risk-scoring-for-protected-actions)|๐Ÿ†• Oct 15, 2026| |**StackAdapt**|[Repair Corrupted Grid Digit Recognition](https://www.fastprep.io/project-coding/stackadapt-corrupted-grid-digit-recognition)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/stackadapt-corrupted-grid-digit-recognition)|๐Ÿ†• Oct 15, 2026| |**Google**|[Count Score Categories](https://www.fastprep.io/problems/google-count-score-categories)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-score-categories)|๐Ÿ†• Oct 15, 2026| |**Google**|[Book Reading Evenings](https://www.fastprep.io/problems/google-book-reading-evenings)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-book-reading-evenings)|๐Ÿ†• Oct 15, 2026| |**ByteDance**|[Implement Multi-Head Attention](https://www.fastprep.io/problems/bytedance-implement-multi-head-attention)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-implement-multi-head-attention)|๐Ÿ†• Oct 15, 2026| |**Harvey**|[Spreadsheet Formula Evaluator](https://www.fastprep.io/problems/harvey-spreadsheet-formula-evaluator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-spreadsheet-formula-evaluator)|๐Ÿ†• Oct 15, 2026| |**Meta**|[Valid Word Abbreviation](https://www.fastprep.io/problems/meta-valid-word-abbreviation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-valid-word-abbreviation)|๐Ÿ†• Oct 15, 2026| |**Amazon**|[Find All People with the Secret](https://www.fastprep.io/problems/amazon-find-all-people-with-secret)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-find-all-people-with-secret)|๐Ÿ†• Oct 15, 2026| |**ByteDance**|[Parse a CSV Record](https://www.fastprep.io/problems/bytedance-parse-csv-record)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-parse-csv-record)|๐Ÿ†• Oct 15, 2026| |**Meta**|[Count Events in Rolling Minute Windows](https://www.fastprep.io/problems/meta-rolling-minute-counter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-rolling-minute-counter)|๐Ÿ†• Oct 15, 2026| |**NVIDIA**|[Least Frequently Used Cache](https://www.fastprep.io/problems/nvidia-lfu-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-lfu-cache)|๐Ÿ†• Oct 15, 2026| |**Databricks**|[Online Bookseller Platform](https://www.fastprep.io/system-design/online-bookseller-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/online-bookseller-platform)|๐Ÿ†• Oct 15, 2026| |**Scale AI**|[Design an Embedding and Classification API](https://www.fastprep.io/system-design/embedding-and-classification-api)|System design|[![Practice][p]](https://www.fastprep.io/system-design/embedding-and-classification-api)|๐Ÿ†• Oct 15, 2026| |**Databricks**|[Design a WAL-Backed Batch Log Writer](https://www.fastprep.io/low-level-design/wal-backed-batch-log-writer)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/wal-backed-batch-log-writer)|๐Ÿ†• Oct 15, 2026| |**Bloomberg LP / Atlassian**|[Design a Streaming Top-K Hitters System](https://www.fastprep.io/system-design/streaming-top-k-hitters)|System design|[![Practice][p]](https://www.fastprep.io/system-design/streaming-top-k-hitters)|๐Ÿ†• Oct 15, 2026| |**Databricks**|[Rectangular K-in-a-Row](https://www.fastprep.io/problems/databricks-rectangular-k-in-a-row)|Coding|[![Practice][p]](https://www.fastprep.io/problems/databricks-rectangular-k-in-a-row)|๐Ÿ†• Oct 15, 2026| |**ByteDance**|[Apply Affine Array Transformations](https://www.fastprep.io/problems/bytedance-apply-affine-array-transformations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-apply-affine-array-transformations)|๐Ÿ†• Oct 15, 2026| |**College Vine**|[Root Job with the Largest Total Duration](https://www.fastprep.io/problems/college-vine-largest-root-job-duration)|Coding|[![Practice][p]](https://www.fastprep.io/problems/college-vine-largest-root-job-duration)|๐Ÿ†• Oct 15, 2026| |**Databricks**|[Top-K Values per Key in MapReduce](https://www.fastprep.io/problems/databricks-mapreduce-per-key-top-k-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/databricks-mapreduce-per-key-top-k-values)|๐Ÿ†• Oct 15, 2026| |**Runloop**|[Choose the Next Minesweeper Action](https://www.fastprep.io/problems/runloop-minesweeper-bot-next-action)|Coding|[![Practice][p]](https://www.fastprep.io/problems/runloop-minesweeper-bot-next-action)|๐Ÿ†• Oct 15, 2026| |**Walmart Labs**|[Delayed Job Scheduler](https://www.fastprep.io/problems/walmart-labs-delayed-job-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walmart-labs-delayed-job-scheduler)|๐Ÿ†• Oct 15, 2026| |**Walmart Labs**|[Find the Duplicate Number](https://www.fastprep.io/problems/walmart-labs-find-duplicate-number)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walmart-labs-find-duplicate-number)|๐Ÿ†• Oct 15, 2026| |**Walmart Labs**|[Product of Array Except Self](https://www.fastprep.io/problems/walmart-labs-product-of-array-except-self)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walmart-labs-product-of-array-except-self)|๐Ÿ†• Oct 15, 2026| |**eBay**|[Repair an Asynchronous Store Update](https://www.fastprep.io/project-coding/ebay-repair-async-store-update)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/ebay-repair-async-store-update)|๐Ÿ†• Oct 15, 2026| |**Coinbase / Goldman Sachs / Robinhood**|[Design a Brokerage Order Processing System](https://www.fastprep.io/system-design/brokerage-order-processing-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/brokerage-order-processing-system)|๐Ÿ†• Oct 14, 2026| |**Robinhood / Rippling**|[Large-Input Word Frequency Analysis](https://www.fastprep.io/system-design/large-input-word-frequency-analysis)|System design|[![Practice][p]](https://www.fastprep.io/system-design/large-input-word-frequency-analysis)|๐Ÿ†• Oct 14, 2026| |**Attentive / Oracle / Amperity / Snap Inc. / Waabi / LinkedIn**|[Design a Time Series Metrics Database](https://www.fastprep.io/system-design/time-series-metrics-database)|System design|[![Practice][p]](https://www.fastprep.io/system-design/time-series-metrics-database)|๐Ÿ†• Oct 14, 2026| |**Perplexity AI**|[Design Durable Long-Running Agentic Query Execution](https://www.fastprep.io/system-design/long-running-agentic-query-execution)|System design|[![Practice][p]](https://www.fastprep.io/system-design/long-running-agentic-query-execution)|๐Ÿ†• Oct 14, 2026| |**Netflix / Google**|[Design a Grounded Recommendation Chatbot](https://www.fastprep.io/system-design/grounded-recommendation-chatbot)|System design|[![Practice][p]](https://www.fastprep.io/system-design/grounded-recommendation-chatbot)|๐Ÿ†• Oct 14, 2026| |**Lyft / WhatNot**|[Donation Platform](https://www.fastprep.io/system-design/donation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/donation-platform)|๐Ÿ†• Oct 14, 2026| |**LinkedIn**|[Known Words Matching Phone Digits](https://www.fastprep.io/problems/linkedin-known-words-for-phone-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-known-words-for-phone-digits)|๐Ÿ†• Oct 14, 2026| |**Rippling**|[Delivery Cost Tracker](https://www.fastprep.io/problems/rippling-delivery-cost-tracker)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-delivery-cost-tracker)|๐Ÿ†• Oct 14, 2026| |**Capital One**|[Check Array Arithmetic Expressions](https://www.fastprep.io/problems/capital-one-check-array-arithmetic-expressions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-check-array-arithmetic-expressions)|๐Ÿ†• Oct 14, 2026| |**Cresta**|[Dynamic Least-Loaded Job Dispatcher](https://www.fastprep.io/problems/cresta-dynamic-job-dispatcher)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cresta-dynamic-job-dispatcher)|๐Ÿ†• Oct 14, 2026| |**Stripe**|[Split Tender Transactions Part 1 - Basic Split Tendering](https://www.fastprep.io/problems/stripe-split-tender-basic)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-split-tender-basic)|๐Ÿ†• Oct 14, 2026| |**Robinhood**|[Top Ten Most Frequent Words in a Book](https://www.fastprep.io/problems/robinhood-top-ten-book-word-frequencies)|Coding|[![Practice][p]](https://www.fastprep.io/problems/robinhood-top-ten-book-word-frequencies)|๐Ÿ†• Oct 14, 2026| |**Decagon**|[Rolling CSAT Tracker](https://www.fastprep.io/problems/decagon-rolling-csat-tracker)|Coding|[![Practice][p]](https://www.fastprep.io/problems/decagon-rolling-csat-tracker)|๐Ÿ†• Oct 14, 2026| |**Retool**|[Maximum Profit with Exactly One Stock Transaction](https://www.fastprep.io/problems/retool-exactly-one-stock-transaction)|Coding|[![Practice][p]](https://www.fastprep.io/problems/retool-exactly-one-stock-transaction)|๐Ÿ†• Oct 14, 2026| |**Capital One**|[Rotate Matrix Over Diagonals](https://www.fastprep.io/problems/capitalone-rotate-matrix-over-diagonals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capitalone-rotate-matrix-over-diagonals)|๐Ÿ†• Oct 14, 2026| |**Airbnb**|[Credit Accounts with Scheduled Transfers](https://www.fastprep.io/problems/airbnb-scheduled-credit-account-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-scheduled-credit-account-ledger)|๐Ÿ†• Oct 14, 2026| |**Applied Intuition**|[Resolve Variable Equations with Dependency Errors](https://www.fastprep.io/problems/applied-intuition-equation-dependency-resolution)|Coding|[![Practice][p]](https://www.fastprep.io/problems/applied-intuition-equation-dependency-resolution)|๐Ÿ†• Oct 14, 2026| |**Capital One**|[Arithmetic Triplets After Queries](https://www.fastprep.io/problems/capital-one-arithmetic-triplets-after-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-arithmetic-triplets-after-queries)|๐Ÿ†• Oct 14, 2026| |**Capital One**|[Branch with the Most Files](https://www.fastprep.io/problems/capital-one-branch-with-most-files)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-branch-with-most-files)|๐Ÿ†• Oct 14, 2026| |**Coinbase**|[Scheduled Payments with Account Aliases](https://www.fastprep.io/problems/coinbase-scheduled-payment-account-resolution)|Coding|[![Practice][p]](https://www.fastprep.io/problems/coinbase-scheduled-payment-account-resolution)|๐Ÿ†• Oct 14, 2026| |**LinkedIn**|[Response Time Across a City Grid](https://www.fastprep.io/problems/linkedin-city-grid-response-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-city-grid-response-time)|๐Ÿ†• Oct 14, 2026| |**LinkedIn**|[Maximum Consecutive Ones in a Circular Array](https://www.fastprep.io/problems/linkedin-maximum-consecutive-ones-circular)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-maximum-consecutive-ones-circular)|๐Ÿ†• Oct 14, 2026| |**LinkedIn**|[Move the Nth Linked-List Node to the Front](https://www.fastprep.io/problems/linkedin-move-nth-node-to-front)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-move-nth-node-to-front)|๐Ÿ†• Oct 14, 2026| |**LinkedIn**|[Rank-Based Cache with a Data Source](https://www.fastprep.io/problems/linkedin-rank-based-data-source-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-rank-based-data-source-cache)|๐Ÿ†• Oct 14, 2026| |**Perplexity AI**|[Sort Topic Names by Prefix and Number](https://www.fastprep.io/problems/perplexity-sort-topic-prefix-and-number)|Coding|[![Practice][p]](https://www.fastprep.io/problems/perplexity-sort-topic-prefix-and-number)|๐Ÿ†• Oct 14, 2026| |**Retool**|[Order Sources by Their Dependencies](https://www.fastprep.io/problems/retool-source-dependency-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/retool-source-dependency-order)|๐Ÿ†• Oct 14, 2026| |**Salesforce**|[Find Rows Common to Two Tables](https://www.fastprep.io/problems/salesforce-intersection-of-two-tables)|SQL|[![Practice][p]](https://www.fastprep.io/problems/salesforce-intersection-of-two-tables)|๐Ÿ†• Oct 14, 2026| |**Salesforce**|[Detect a Cycle in a Linked List](https://www.fastprep.io/problems/salesforce-linked-list-cycle-detection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-linked-list-cycle-detection)|๐Ÿ†• Oct 14, 2026| |**Salesforce**|[Merge Two Sorted Linked Lists](https://www.fastprep.io/problems/salesforce-merge-two-sorted-linked-lists)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-merge-two-sorted-linked-lists)|๐Ÿ†• Oct 14, 2026| |**Intuit**|[Maximum Square-Free Divisor](https://www.fastprep.io/problems/intuit-maximum-square-free-divisor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/intuit-maximum-square-free-divisor)|๐Ÿ†• Oct 14, 2026| |**Intuit**|[Longest Repeated Letter Block with Adjacent Swaps](https://www.fastprep.io/problems/intuit-longest-repeated-block-adjacent-swaps)|Coding|[![Practice][p]](https://www.fastprep.io/problems/intuit-longest-repeated-block-adjacent-swaps)|๐Ÿ†• Oct 14, 2026| |**Intuit**|[Two Tribes from Taller-Person Counts](https://www.fastprep.io/problems/intuit-two-tribes-taller-count-assignments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/intuit-two-tribes-taller-count-assignments)|๐Ÿ†• Oct 14, 2026| |**Optiver**|[Power Cell Bank](https://www.fastprep.io/problems/optiver-power-cell-bank)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optiver-power-cell-bank)|๐Ÿ†• Oct 14, 2026| |**Akuna Capital**|[Rolling Metrics](https://www.fastprep.io/problems/akuna-rolling-metrics)|Coding|[![Practice][p]](https://www.fastprep.io/problems/akuna-rolling-metrics)|๐Ÿ†• Oct 14, 2026| |**Goldman Sachs**|[Count Redundant File Backups](https://www.fastprep.io/problems/goldman-sachs-count-redundant-file-backups)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-count-redundant-file-backups)|๐Ÿ†• Oct 14, 2026| |**Confluent**|[Count Combinations Using Weights One Through K](https://www.fastprep.io/problems/confluent-count-weight-combinations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-count-weight-combinations)|๐Ÿ†• Oct 14, 2026| |**Confluent**|[Sum Symmetric Pairwise Remainders](https://www.fastprep.io/problems/confluent-sum-symmetric-pairwise-remainders)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-sum-symmetric-pairwise-remainders)|๐Ÿ†• Oct 14, 2026| |**Jane Street**|[Instrument Stack Language Jumps](https://www.fastprep.io/problems/jane-street-instrument-stack-language-jumps)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-instrument-stack-language-jumps)|๐Ÿ†• Oct 14, 2026| |**Jane Street**|[Run a Stack Language Interpreter](https://www.fastprep.io/problems/jane-street-stack-language-interpreter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-stack-language-interpreter)|๐Ÿ†• Oct 14, 2026| |**OpenAI / Commvault / Zomato / Eternal / Upstart**|[Design an Online Chess Platform](https://www.fastprep.io/system-design/online-chess-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/online-chess-platform)|๐Ÿ†• Oct 14, 2026| |**Sphere**|[Design an Address and Date Tax Engine](https://www.fastprep.io/system-design/address-date-tax-engine)|System design|[![Practice][p]](https://www.fastprep.io/system-design/address-date-tax-engine)|๐Ÿ†• Oct 14, 2026| |**Sphere**|[Integrate a State Tax API](https://www.fastprep.io/project-coding/sphere-state-tax-api-integration)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/sphere-state-tax-api-integration)|๐Ÿ†• Oct 14, 2026| |**Upstart**|[Build a Poll and Voting API](https://www.fastprep.io/project-coding/upstart-poll-voting-api)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/upstart-poll-voting-api)|๐Ÿ†• Oct 14, 2026| |**College Vine**|[Calculate a Token-List Expression](https://www.fastprep.io/problems/college-vine-token-list-calculator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/college-vine-token-list-calculator)|๐Ÿ†• Oct 14, 2026| |**Jane Street**|[Code Editor Folding](https://www.fastprep.io/problems/jane-street-code-editor-folding)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-code-editor-folding)|๐Ÿ†• Oct 14, 2026| |**Upstart**|[Babysitter Quote with Hourly Rates](https://www.fastprep.io/problems/upstart-babysitter-hourly-quote)|Coding|[![Practice][p]](https://www.fastprep.io/problems/upstart-babysitter-hourly-quote)|๐Ÿ†• Oct 14, 2026| |**Upstart**|[Maximum Subarray](https://www.fastprep.io/problems/upstart-maximum-subarray)|Coding|[![Practice][p]](https://www.fastprep.io/problems/upstart-maximum-subarray)|๐Ÿ†• Oct 14, 2026| |**Google**|[Maximum Task Reward Within a Time Budget](https://www.fastprep.io/problems/google-task-reward-under-time-budget)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-task-reward-under-time-budget)|๐Ÿ†• Oct 14, 2026| |**Reevo**|[Airline Seat Booking](https://www.fastprep.io/project-coding/reevo-airline-seat-booking)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/reevo-airline-seat-booking)|๐Ÿ†• Oct 14, 2026| |**Perplexity AI**|[Analyze JSONL Click Data Quality in a Notebook](https://www.fastprep.io/project-coding/perplexity-jsonl-click-data-quality)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/perplexity-jsonl-click-data-quality)|๐Ÿ†• Oct 14, 2026| |**ByteDance / Sphere**|[Relational Query Index Design](https://www.fastprep.io/system-design/relational-query-index-design)|System design|[![Practice][p]](https://www.fastprep.io/system-design/relational-query-index-design)|๐Ÿ†• Oct 14, 2026| |**Globalization Partners / Coupa Software / Adobe**|[Design and Repair a Thread-Safe Configuration Singleton](https://www.fastprep.io/low-level-design/thread-safe-configuration-singleton)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/thread-safe-configuration-singleton)|๐Ÿ†• Oct 13, 2026| |**Adobe**|[Design and Implement Shared and Weak Ownership Pointers](https://www.fastprep.io/low-level-design/smart-pointer-ownership-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/smart-pointer-ownership-domain)|๐Ÿ†• Oct 13, 2026| |**Google**|[Count Enclosed Freshwater Regions](https://www.fastprep.io/problems/google-count-enclosed-freshwater-regions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-enclosed-freshwater-regions)|๐Ÿ†• Oct 13, 2026| |**Google**|[Path Leaf Character Iterator](https://www.fastprep.io/problems/google-path-leaf-character-iterator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-path-leaf-character-iterator)|๐Ÿ†• Oct 13, 2026| |**Google**|[Merge Hierarchical Trees by Name](https://www.fastprep.io/problems/google-merge-hierarchical-trees-by-name)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-merge-hierarchical-trees-by-name)|๐Ÿ†• Oct 13, 2026| |**OpenAI / ByteDance**|[Payment Hold, Charge, and Settlement](https://www.fastprep.io/system-design/payment-hold-charge-settlement)|System design|[![Practice][p]](https://www.fastprep.io/system-design/payment-hold-charge-settlement)|๐Ÿ†• Oct 13, 2026| |**Mercor**|[Design an Exact User-ID Membership Store](https://www.fastprep.io/system-design/exact-user-id-membership-store)|System design|[![Practice][p]](https://www.fastprep.io/system-design/exact-user-id-membership-store)|๐Ÿ†• Oct 13, 2026| |**Goldman Sachs**|[Trapping Rain Water](https://www.fastprep.io/problems/goldman-sachs-trapping-rain-water)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-trapping-rain-water)|๐Ÿ†• Oct 13, 2026| |**OpenAI**|[Evaluate Noisy Annotators](https://www.fastprep.io/problems/openai-noisy-annotator-evaluation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-noisy-annotator-evaluation)|๐Ÿ†• Oct 13, 2026| |**OpenAI**|[Poker Deal and Hand-Winner Simulation](https://www.fastprep.io/problems/openai-poker-deal-and-hand-winner)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-poker-deal-and-hand-winner)|๐Ÿ†• Oct 13, 2026| |**LinkedIn**|[Repeated Shortest Word Distance Queries](https://www.fastprep.io/problems/linkedin-shortest-word-distance-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-shortest-word-distance-queries)|๐Ÿ†• Oct 13, 2026| |**Mercor**|[Sort by Checking Permutations](https://www.fastprep.io/problems/mercor-permutation-enumeration-sort)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-permutation-enumeration-sort)|๐Ÿ†• Oct 13, 2026| |**Mercor**|[Coffee Rank Probability](https://www.fastprep.io/problems/mercor-coffee-rank-probability)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-coffee-rank-probability)|๐Ÿ†• Oct 13, 2026| |**Legora**|[Parse and Sort Integer Data](https://www.fastprep.io/problems/legora-parse-and-sort-integer-data)|Coding|[![Practice][p]](https://www.fastprep.io/problems/legora-parse-and-sort-integer-data)|๐Ÿ†• Oct 13, 2026| |**The D.E. Shaw Group**|[Equal-Weight Portfolio Variance](https://www.fastprep.io/problems/de-shaw-equal-weight-portfolio-variance)|Coding|[![Practice][p]](https://www.fastprep.io/problems/de-shaw-equal-weight-portfolio-variance)|๐Ÿ†• Oct 13, 2026| |**Goldman Sachs**|[Is a Power of Ten](https://www.fastprep.io/problems/goldman-sachs-is-power-of-ten)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-is-power-of-ten)|๐Ÿ†• Oct 13, 2026| |**Goldman Sachs**|[Square Root with Newton Iteration](https://www.fastprep.io/problems/goldman-sachs-newton-square-root)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-newton-square-root)|๐Ÿ†• Oct 13, 2026| |**Goldman Sachs**|[Count Staircase Ways](https://www.fastprep.io/problems/goldman-sachs-count-staircase-ways)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-count-staircase-ways)|๐Ÿ†• Oct 13, 2026| |**Goldman Sachs**|[Minimum Traveling Salesperson Tour](https://www.fastprep.io/problems/goldman-sachs-minimum-traveling-salesperson-tour)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-minimum-traveling-salesperson-tour)|๐Ÿ†• Oct 13, 2026| |**Baseten**|[XOR Pseudorandom Sequence](https://www.fastprep.io/problems/baseten-xor-random-number-generator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/baseten-xor-random-number-generator)|๐Ÿ†• Oct 13, 2026| |**Baseten**|[RNG-Based Tree Document Codec](https://www.fastprep.io/problems/baseten-rng-tree-document-codec)|Coding|[![Practice][p]](https://www.fastprep.io/problems/baseten-rng-tree-document-codec)|๐Ÿ†• Oct 13, 2026| |**Baseten**|[Single-Pass S-Expression Parser](https://www.fastprep.io/problems/baseten-single-pass-s-expression-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/baseten-single-pass-s-expression-parser)|๐Ÿ†• Oct 13, 2026| |**ByteDance**|[Merge Overlapping Intervals](https://www.fastprep.io/problems/bytedance-merge-overlapping-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-merge-overlapping-intervals)|๐Ÿ†• Oct 13, 2026| |**ByteDance**|[Tic-Tac-Toe Move Winners](https://www.fastprep.io/problems/bytedance-tic-tac-toe-move-winners)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-tic-tac-toe-move-winners)|๐Ÿ†• Oct 13, 2026| |**ByteDance**|[Binary Tree Maximum Path Sum](https://www.fastprep.io/problems/bytedance-binary-tree-maximum-path-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-binary-tree-maximum-path-sum)|๐Ÿ†• Oct 13, 2026| |**Anthropic / Snap Inc. / Lyft / Fivetran / Temporal**|[One-to-One Chat Service](https://www.fastprep.io/system-design/one-to-one-chat-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/one-to-one-chat-service)|๐Ÿ†• Oct 13, 2026| |**Anthropic**|[Design a Prompt Playground](https://www.fastprep.io/system-design/prompt-playground-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/prompt-playground-system)|๐Ÿ†• Oct 13, 2026| |**Sierra**|[Design a Resumable Streaming AI Chat](https://www.fastprep.io/system-design/resumable-streaming-ai-chat)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resumable-streaming-ai-chat)|๐Ÿ†• Oct 13, 2026| |**Confluent**|[Sequential Phrase Search Across Documents](https://www.fastprep.io/problems/confluent-sequential-phrase-search-across-documents)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-sequential-phrase-search-across-documents)|๐Ÿ†• Oct 13, 2026| |**Confluent**|[Sudoku Puzzle Solver](https://www.fastprep.io/problems/confluent-sudoku-puzzle-solver)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-sudoku-puzzle-solver)|๐Ÿ†• Oct 13, 2026| |**OpenAI**|[Segmented Durable Key-Value Store](https://www.fastprep.io/problems/openai-segmented-durable-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-segmented-durable-key-value-store)|๐Ÿ†• Oct 13, 2026| |**Confluent**|[Match a Variadic Function Signature](https://www.fastprep.io/problems/confluent-variadic-function-signature-match)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-variadic-function-signature-match)|๐Ÿ†• Oct 13, 2026| |**Anthropic**|[Banking System, Part 1: Accounts and Transfers](https://www.fastprep.io/problems/anthropic-banking-system-part-1)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-banking-system-part-1)|๐Ÿ†• Oct 13, 2026| |**Anthropic**|[Recover a Function-Call LRU Cache with a Write-Ahead Log](https://www.fastprep.io/problems/anthropic-function-call-lru-cache-with-wal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-function-call-lru-cache-with-wal)|๐Ÿ†• Oct 13, 2026| |**Lyft**|[Deterministic K-Means Assignments](https://www.fastprep.io/problems/lyft-deterministic-k-means-assignments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lyft-deterministic-k-means-assignments)|๐Ÿ†• Oct 13, 2026| |**Confluent**|[Sudoku Board Validation](https://www.fastprep.io/problems/confluent-sudoku-board-validation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-sudoku-board-validation)|๐Ÿ†• Oct 13, 2026| |**Amazon / Goldman Sachs / Wayfair / Walmart / Navan / Uber / Morgan Stanley**|[Design a Multi-Floor Parking Lot](https://www.fastprep.io/low-level-design/multi-floor-parking-lot)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/multi-floor-parking-lot)|๐Ÿ†• Oct 12, 2026| |**Anthropic**|[Design Opaque-GPU Inference Capacity](https://www.fastprep.io/system-design/opaque-gpu-inference-capacity-review)|System design|[![Practice][p]](https://www.fastprep.io/system-design/opaque-gpu-inference-capacity-review)|๐Ÿ†• Oct 12, 2026| |**Atlassian**|[Design a Responsive Product Catalog Search Frontend](https://www.fastprep.io/system-design/responsive-product-catalog-search-frontend)|System design|[![Practice][p]](https://www.fastprep.io/system-design/responsive-product-catalog-search-frontend)|๐Ÿ†• Oct 12, 2026| |**Postman / Anduril / DigitalOcean / Oracle / Adobe / Uber Freight / Grab / Goldman Sachs / Salesforce / Vercel / Sentry / Motive / Deloitte / ZipRecruiter**|[Design a URL Shortening Service](https://www.fastprep.io/system-design/url-shortening-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/url-shortening-service)|๐Ÿ†• Oct 12, 2026| |**Oracle**|[Design an LRU Cache Object Model](https://www.fastprep.io/low-level-design/lru-cache-object-model)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/lru-cache-object-model)|๐Ÿ†• Oct 12, 2026| |**Perplexity AI**|[In-Memory Filesystem Commands](https://www.fastprep.io/problems/perplexity-ai-in-memory-filesystem-commands)|Coding|[![Practice][p]](https://www.fastprep.io/problems/perplexity-ai-in-memory-filesystem-commands)|๐Ÿ†• Oct 12, 2026| |**Pinterest**|[Minimum Bus Routes to a Destination](https://www.fastprep.io/problems/pinterest-minimum-bus-routes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-minimum-bus-routes)|๐Ÿ†• Oct 12, 2026| |**Stripe**|[Financial Account Ledger](https://www.fastprep.io/problems/stripe-financial-account-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-financial-account-ledger)|๐Ÿ†• Oct 12, 2026| |**Rippling**|[Delivery Cost Tracker with Effective-Dated Rates](https://www.fastprep.io/problems/rippling-delivery-cost-tracker-with-rate-history)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-delivery-cost-tracker-with-rate-history)|๐Ÿ†• Oct 12, 2026| |**Nuro**|[Assign Robots to Their Nearest Available Items](https://www.fastprep.io/problems/nuro-nearest-item-assignment)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nuro-nearest-item-assignment)|๐Ÿ†• Oct 12, 2026| |**Snowflake**|[Find Valid SET Card Triples](https://www.fastprep.io/problems/snowflake-find-valid-set-card-triples)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-find-valid-set-card-triples)|๐Ÿ†• Oct 12, 2026| |**Snowflake**|[Sum of Binary Tree Boundary Nodes](https://www.fastprep.io/problems/snowflake-binary-tree-boundary-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-binary-tree-boundary-sum)|๐Ÿ†• Oct 12, 2026| |**Oracle**|[Minimum Meeting Rooms](https://www.fastprep.io/problems/oracle-meeting-rooms-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-meeting-rooms-ii)|๐Ÿ†• Oct 12, 2026| |**Oracle**|[Time-Based Key-Value Store](https://www.fastprep.io/problems/oracle-time-based-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-time-based-key-value-store)|๐Ÿ†• Oct 12, 2026| |**Oracle**|[Detect a Cycle in a Directed Graph](https://www.fastprep.io/problems/oracle-directed-graph-cycle-detection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-directed-graph-cycle-detection)|๐Ÿ†• Oct 12, 2026| |**Pinterest**|[Top-Scoring Items in a Time Window](https://www.fastprep.io/problems/pinterest-time-window-top-scoring-items)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-time-window-top-scoring-items)|๐Ÿ†• Oct 12, 2026| |**Amazon / Groww**|[Design and Implement a Shopping Cart Price Calculator](https://www.fastprep.io/low-level-design/shopping-cart-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/shopping-cart-domain)|๐Ÿ†• Oct 12, 2026| |**Sentry / Amazon**|[Design and Implement a Multi-Entrance Parking Lot](https://www.fastprep.io/low-level-design/multi-entrance-sized-parking-lot)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/multi-entrance-sized-parking-lot)|๐Ÿ†• Oct 12, 2026| |**OpenAI**|[Simplify a Quadratic Expression](https://www.fastprep.io/problems/openai-simplify-quadratic-expression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-simplify-quadratic-expression)|๐Ÿ†• Oct 12, 2026| |**OpenAI**|[Macaron Order Price](https://www.fastprep.io/problems/openai-macaron-order-price)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-macaron-order-price)|๐Ÿ†• Oct 12, 2026| |**OpenAI**|[Longest Increasing Price Subsequence](https://www.fastprep.io/problems/openai-longest-increasing-price-subsequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-longest-increasing-price-subsequence)|๐Ÿ†• Oct 12, 2026| |**OpenAI**|[Shortest Atom Action Path](https://www.fastprep.io/problems/openai-shortest-atom-action-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-shortest-atom-action-path)|๐Ÿ†• Oct 12, 2026| |**Apple**|[Implement Hit Counter](https://www.fastprep.io/problems/apple-hit-counter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-hit-counter)|๐Ÿ†• Oct 12, 2026| |**Optiver**|[Overheat Prevention Controller](https://www.fastprep.io/problems/optiver-overheat-prevention-controller)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optiver-overheat-prevention-controller)|๐Ÿ†• Oct 12, 2026| |**Netflix**|[Timed Cache with Sidecar Cleanup](https://www.fastprep.io/problems/netflix-timed-cache-with-sidecar-cleanup)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-timed-cache-with-sidecar-cleanup)|๐Ÿ†• Oct 12, 2026| |**MongoDB**|[Lazy K-Way Union Iterator](https://www.fastprep.io/problems/mongodb-lazy-k-way-union-iterator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mongodb-lazy-k-way-union-iterator)|๐Ÿ†• Oct 12, 2026| |**Apple**|[Producer-Consumer Queue](https://www.fastprep.io/problems/apple-producer-consumer-queue)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-producer-consumer-queue)|๐Ÿ†• Oct 12, 2026| |**Apple**|[Reusable Cyclic Barrier](https://www.fastprep.io/problems/apple-reusable-cyclic-barrier)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-reusable-cyclic-barrier)|๐Ÿ†• Oct 12, 2026| |**Apple**|[FIFO Mutex Operation Trace](https://www.fastprep.io/problems/apple-fifo-mutex-operation-trace)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-fifo-mutex-operation-trace)|๐Ÿ†• Oct 12, 2026| |**Apple**|[Topological Ordering](https://www.fastprep.io/problems/apple-lexicographic-topological-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-lexicographic-topological-order)|๐Ÿ†• Oct 12, 2026| |**ByteDance**|[Kth Largest Element without a Heap](https://www.fastprep.io/problems/bytedance-kth-largest-without-heap)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-kth-largest-without-heap)|๐Ÿ†• Oct 12, 2026| |**Google**|[Minimum Cars for Rental Requests](https://www.fastprep.io/problems/google-minimum-cars-for-rental-requests)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-minimum-cars-for-rental-requests)|๐Ÿ†• Oct 12, 2026| |**Google**|[Equal Sum Split After One Removal](https://www.fastprep.io/problems/google-equal-sum-split-after-one-removal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-equal-sum-split-after-one-removal)|๐Ÿ†• Oct 12, 2026| |**Capital One**|[Distinct Values on Maximum-Sum Frames](https://www.fastprep.io/problems/capital-one-maximum-border-frame-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-maximum-border-frame-values)|๐Ÿ†• Oct 12, 2026| |**Capital One**|[Wait Until the Next Bus](https://www.fastprep.io/problems/capital-one-next-bus-wait)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-next-bus-wait)|๐Ÿ†• Oct 12, 2026| |**Capital One**|[Count One-Swap Number Pairs](https://www.fastprep.io/problems/capital-one-count-one-swap-number-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-count-one-swap-number-pairs)|๐Ÿ†• Oct 12, 2026| |**Stripe**|[Monthly Calendar with Custom Week Start](https://www.fastprep.io/problems/stripe-monthly-calendar-custom-week-start)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-monthly-calendar-custom-week-start)|๐Ÿ†• Oct 12, 2026| |**Google**|[Dynamic Prefix Query Counts](https://www.fastprep.io/problems/google-dynamic-prefix-query-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-dynamic-prefix-query-counts)|๐Ÿ†• Oct 12, 2026| |**Google**|[Two or Three Sum Existence](https://www.fastprep.io/problems/google-two-or-three-sum-existence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-two-or-three-sum-existence)|๐Ÿ†• Oct 12, 2026| |**Persona**|[Task Manager with Timed Assignments](https://www.fastprep.io/problems/persona-task-manager-with-timed-assignments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/persona-task-manager-with-timed-assignments)|๐Ÿ†• Oct 12, 2026| |**Google**|[Inorder Tree String Equivalence](https://www.fastprep.io/problems/google-inorder-tree-string-equivalence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-inorder-tree-string-equivalence)|๐Ÿ†• Oct 12, 2026| |**Headlands Technologies**|[Array Interval Sums](https://www.fastprep.io/problems/headlands-array-interval-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/headlands-array-interval-sums)|๐Ÿ†• Oct 11, 2026| |**Dell Technologies**|[Repair Expiration and Soft Deletion](https://www.fastprep.io/project-coding/dell-expiration-soft-delete-repair)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/dell-expiration-soft-delete-repair)|๐Ÿ†• Oct 11, 2026| |**Amazon**|[Design Agentic Security Stream Detection](https://www.fastprep.io/system-design/agentic-security-stream-detection)|System design|[![Practice][p]](https://www.fastprep.io/system-design/agentic-security-stream-detection)|๐Ÿ†• Oct 11, 2026| |**Amazon**|[Minimum Completion Time for DAG Dependencies](https://www.fastprep.io/problems/amazon-minimum-dag-completion-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-dag-completion-time)|๐Ÿ†• Oct 11, 2026| |**Pinterest**|[Optimal Account Balancing](https://www.fastprep.io/problems/pinterest-optimal-account-balancing)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-optimal-account-balancing)|๐Ÿ†• Oct 11, 2026| |**Amazon**|[Available Recipes from Initial Supplies](https://www.fastprep.io/problems/amazon-available-recipes-from-supplies)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-available-recipes-from-supplies)|๐Ÿ†• Oct 11, 2026| |**NVIDIA**|[Parallel String Counts with a Custom Hash Table](https://www.fastprep.io/problems/nvidia-parallel-custom-string-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nvidia-parallel-custom-string-counts)|๐Ÿ†• Oct 11, 2026| |**Amazon**|[Design a Smart Thermostat Telemetry Platform](https://www.fastprep.io/system-design/smart-thermostat-telemetry-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/smart-thermostat-telemetry-platform)|๐Ÿ†• Oct 11, 2026| |**Amazon**|[Design a Bounded Flash Logging Buffer](https://www.fastprep.io/low-level-design/flash-partition-logging-buffer)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/flash-partition-logging-buffer)|๐Ÿ†• Oct 11, 2026| |**Okta**|[Design a Persistent Chronological Social Feed](https://www.fastprep.io/low-level-design/persistent-social-news-feed-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/persistent-social-news-feed-domain)|๐Ÿ†• Oct 11, 2026| |**TikTok**|[Count Subarrays with at Least K Equal-Fruit Pairs](https://www.fastprep.io/problems/tiktok-count-subarrays-with-k-fruit-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-subarrays-with-k-fruit-pairs)|๐Ÿ†• Oct 11, 2026| |**TikTok**|[Simulate Orchard Rot Spread](https://www.fastprep.io/problems/tiktok-orchard-rot-spread)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-orchard-rot-spread)|๐Ÿ†• Oct 11, 2026| |**Capital One**|[Analyze House and Viewing Metrics](https://www.fastprep.io/problems/capital-one-house-and-viewing-insights)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-house-and-viewing-insights)|๐Ÿ†• Oct 11, 2026| |**Capital One**|[Build House Viewing Features](https://www.fastprep.io/problems/capital-one-build-house-viewing-features)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-build-house-viewing-features)|๐Ÿ†• Oct 11, 2026| |**Capital One**|[Prepare House Price Regression Data](https://www.fastprep.io/problems/capital-one-prepare-house-price-data)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-prepare-house-price-data)|๐Ÿ†• Oct 11, 2026| |**Capital One**|[Predict House Prices](https://www.fastprep.io/problems/capital-one-predict-house-prices)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-predict-house-prices)|๐Ÿ†• Oct 11, 2026| |**Microsoft**|[Maximum Escape Game Score](https://www.fastprep.io/problems/microsoft-maximum-escape-game-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-maximum-escape-game-score)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Dynamic Sum Pair Queries](https://www.fastprep.io/problems/hrt-dynamic-sum-pair-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-dynamic-sum-pair-queries)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Catch Fish with Reusable Baits](https://www.fastprep.io/problems/hrt-catch-fish-with-reusable-baits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-catch-fish-with-reusable-baits)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Robot Final Direction](https://www.fastprep.io/problems/hrt-robot-final-direction)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-robot-final-direction)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Branch with Most Files](https://www.fastprep.io/problems/hrt-branch-with-most-files)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-branch-with-most-files)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Render Chat Conversation](https://www.fastprep.io/problems/hrt-render-chat-conversation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-render-chat-conversation)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Lamps and Control Points](https://www.fastprep.io/problems/hrt-lamps-and-control-points)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-lamps-and-control-points)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Check Array Arithmetic Expressions](https://www.fastprep.io/problems/hrt-check-array-arithmetic-expressions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-check-array-arithmetic-expressions)|๐Ÿ†• Oct 11, 2026| |**Hudson River Trading**|[Bouncing Diagonal Weights](https://www.fastprep.io/problems/hrt-bouncing-diagonal-weights)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-bouncing-diagonal-weights)|๐Ÿ†• Oct 11, 2026| |**TikTok**|[Robot Final Direction](https://www.fastprep.io/problems/tiktok-robot-final-direction)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-robot-final-direction)|๐Ÿ†• Oct 11, 2026| |**TikTok**|[Shell Command Counts with History References](https://www.fastprep.io/problems/tiktok-shell-history-command-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-shell-history-command-counts)|๐Ÿ†• Oct 11, 2026| |**Microsoft**|[Minimum Server Connection Costs](https://www.fastprep.io/problems/microsoft-minimum-server-connection-costs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-minimum-server-connection-costs)|๐Ÿ†• Oct 11, 2026| |**Belvedere Trading**|[Minimum Amount](https://www.fastprep.io/problems/belvedere-trading-minimum-amount)|Coding|[![Practice][p]](https://www.fastprep.io/problems/belvedere-trading-minimum-amount)|๐Ÿ†• Oct 11, 2026| |**Belvedere Trading**|[Realized PnL with Oldest Inventory First](https://www.fastprep.io/problems/belvedere-trading-realized-pnl-oldest-inventory-first)|Coding|[![Practice][p]](https://www.fastprep.io/problems/belvedere-trading-realized-pnl-oldest-inventory-first)|๐Ÿ†• Oct 11, 2026| |**Belvedere Trading**|[Daily Settlement for Long and Short Positions](https://www.fastprep.io/problems/belvedere-trading-daily-settlement-long-and-short)|Coding|[![Practice][p]](https://www.fastprep.io/problems/belvedere-trading-daily-settlement-long-and-short)|๐Ÿ†• Oct 11, 2026| |**Belvedere Trading**|[Distances to Cycles](https://www.fastprep.io/problems/belvedere-trading-distances-to-cycles)|Coding|[![Practice][p]](https://www.fastprep.io/problems/belvedere-trading-distances-to-cycles)|๐Ÿ†• Oct 11, 2026| |**IBM**|[Maximum Compatible Time Windows](https://www.fastprep.io/problems/ibm-maximum-compatible-time-windows)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-maximum-compatible-time-windows)|๐Ÿ†• Oct 11, 2026| |**IBM**|[Last Object Exit Time](https://www.fastprep.io/problems/ibm-last-object-exit-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-last-object-exit-time)|๐Ÿ†• Oct 10, 2026| |**IBM**|[Maximum Easy Tasks After Rearranging](https://www.fastprep.io/problems/ibm-maximum-easy-tasks-after-rearranging)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-maximum-easy-tasks-after-rearranging)|๐Ÿ†• Oct 10, 2026| |**Google**|[Word Ladder](https://www.fastprep.io/problems/google-word-ladder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-word-ladder)|๐Ÿ†• Oct 10, 2026| |**Google**|[Validate Server Log Summary Counts](https://www.fastprep.io/problems/google-validate-server-log-summary)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-validate-server-log-summary)|๐Ÿ†• Oct 10, 2026| |**Google**|[Generate an Unbiased Bit from a Biased Coin](https://www.fastprep.io/problems/google-unbiased-bit-from-biased-coin)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-unbiased-bit-from-biased-coin)|๐Ÿ†• Oct 10, 2026| |**Twitch / Citadel / Kotak Mahindra Bank**|[Design and Implement a Terminal Battleship Game](https://www.fastprep.io/low-level-design/battleship-game)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/battleship-game)|๐Ÿ†• Oct 10, 2026| |**Stripe / PhonePe**|[Design a Feature Flag Platform](https://www.fastprep.io/system-design/feature-flag-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/feature-flag-platform)|๐Ÿ†• Oct 10, 2026| |**Apple**|[Design Consumer-Outage Backlog Recovery](https://www.fastprep.io/system-design/kafka-consumer-outage-backlog-recovery)|System design|[![Practice][p]](https://www.fastprep.io/system-design/kafka-consumer-outage-backlog-recovery)|๐Ÿ†• Oct 10, 2026| |**PhonePe**|[Complete a Journey Stage Event Service](https://www.fastprep.io/project-coding/phonepe-journey-stage-event-service)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/phonepe-journey-stage-event-service)|๐Ÿ†• Oct 10, 2026| |**Valon**|[Design Loan Repayment and Investor Distribution](https://www.fastprep.io/system-design/loan-repayment-and-investor-distribution)|System design|[![Practice][p]](https://www.fastprep.io/system-design/loan-repayment-and-investor-distribution)|๐Ÿ†• Oct 10, 2026| |**Airbnb**|[Decode and Store Strings](https://www.fastprep.io/problems/airbnb-decode-and-store-strings)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-decode-and-store-strings)|๐Ÿ†• Oct 10, 2026| |**Persona**|[Rank Football Teams](https://www.fastprep.io/problems/persona-rank-football-teams)|Coding|[![Practice][p]](https://www.fastprep.io/problems/persona-rank-football-teams)|๐Ÿ†• Oct 10, 2026| |**OpenAI**|[Durable Work Queue with Dependencies](https://www.fastprep.io/problems/openai-durable-work-queue-with-dependencies)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-durable-work-queue-with-dependencies)|๐Ÿ†• Oct 10, 2026| |**Valon**|[Out-of-Order Loan Ledger](https://www.fastprep.io/problems/valon-out-of-order-loan-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/valon-out-of-order-loan-ledger)|๐Ÿ†• Oct 10, 2026| |**Sierra**|[Maximum Array Value](https://www.fastprep.io/problems/sierra-maximum-array-value)|Coding|[![Practice][p]](https://www.fastprep.io/problems/sierra-maximum-array-value)|๐Ÿ†• Oct 10, 2026| |**Capital One**|[Count Records Present in A but Not B](https://www.fastprep.io/problems/capital-one-count-records-in-a-not-b)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-count-records-in-a-not-b)|๐Ÿ†• Oct 10, 2026| |**Amazon**|[Repair Workflow Issue and Sub-Issue Creation](https://www.fastprep.io/project-coding/amazon-repair-workflow-issues)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/amazon-repair-workflow-issues)|๐Ÿ†• Oct 09, 2026| |**Attentive**|[Design a Third-Party Data Pull Platform](https://www.fastprep.io/system-design/third-party-data-pull-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/third-party-data-pull-platform)|๐Ÿ†• Oct 09, 2026| |**Uber**|[Design a Graph-Based Resource Access Platform](https://www.fastprep.io/system-design/graph-based-resource-access-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/graph-based-resource-access-platform)|๐Ÿ†• Oct 09, 2026| |**Uber**|[Design a Participant Meeting Scheduler](https://www.fastprep.io/low-level-design/participant-meeting-scheduler)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/participant-meeting-scheduler)|๐Ÿ†• Oct 09, 2026| |**AMD**|[Insert After a Linked-List Node](https://www.fastprep.io/problems/amd-insert-after-linked-list-node)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amd-insert-after-linked-list-node)|๐Ÿ†• Oct 09, 2026| |**AMD**|[LRU Cache](https://www.fastprep.io/problems/amd-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amd-lru-cache)|๐Ÿ†• Oct 09, 2026| |**OpenAI**|[Budgeted API Inference with Out-of-Order Feedback](https://www.fastprep.io/problems/openai-budgeted-api-inference)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-budgeted-api-inference)|๐Ÿ†• Oct 09, 2026| |**Susquehanna International Group (SIG)**|[Count Equal or One-Swap Number Pairs](https://www.fastprep.io/problems/susquehanna-count-one-swap-number-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-count-one-swap-number-pairs)|๐Ÿ†• Oct 09, 2026| |**Susquehanna International Group (SIG)**|[Split a Matrix by Nonnegative Region Averages](https://www.fastprep.io/problems/susquehanna-partition-matrix-by-nonnegative-averages)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-partition-matrix-by-nonnegative-averages)|๐Ÿ†• Oct 09, 2026| |**Decagon**|[Count Complete Tic-Tac-Toe Games](https://www.fastprep.io/problems/decagon-count-complete-tic-tac-toe-games)|Coding|[![Practice][p]](https://www.fastprep.io/problems/decagon-count-complete-tic-tac-toe-games)|๐Ÿ†• Oct 09, 2026| |**Ramp**|[Cloud Storage Compression and Decompression](https://www.fastprep.io/problems/ramp-cloud-storage-compression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ramp-cloud-storage-compression)|๐Ÿ†• Oct 09, 2026| |**Visa**|[Minimum Operations to Reduce a Transaction Ledger](https://www.fastprep.io/problems/visa-minimum-remaining-transaction-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-minimum-remaining-transaction-ledger)|๐Ÿ†• Oct 09, 2026| |**Visa**|[Count Attack Vectors by Divisor Range](https://www.fastprep.io/problems/visa-count-attack-vectors-by-divisor-range)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-count-attack-vectors-by-divisor-range)|๐Ÿ†• Oct 09, 2026| |**Visa**|[Longest Non-Decreasing Substring After Pair Swaps](https://www.fastprep.io/problems/visa-longest-nondecreasing-substring-after-pair-swaps)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-longest-nondecreasing-substring-after-pair-swaps)|๐Ÿ†• Oct 09, 2026| |**TikTok**|[Count Three-Digit Numbers with Distinct Digits](https://www.fastprep.io/problems/tiktok-count-distinct-three-digit-numbers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-distinct-three-digit-numbers)|๐Ÿ†• Oct 09, 2026| |**TikTok**|[Rank Football Teams](https://www.fastprep.io/problems/tiktok-rank-football-teams)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-rank-football-teams)|๐Ÿ†• Oct 09, 2026| |**TikTok**|[Distinct Values on Maximum-Sum Frames](https://www.fastprep.io/problems/tiktok-sum-distinct-winning-frame-border-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-sum-distinct-winning-frame-border-values)|๐Ÿ†• Oct 09, 2026| |**Jefferies**|[Maximum Income from Asset Trading](https://www.fastprep.io/problems/jefferies-maximum-income-from-asset-trading)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jefferies-maximum-income-from-asset-trading)|๐Ÿ†• Oct 09, 2026| |**Jefferies**|[Repair a Binary Search](https://www.fastprep.io/problems/jefferies-repair-binary-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jefferies-repair-binary-search)|๐Ÿ†• Oct 09, 2026| |**Google**|[Longest Common Parent Directory](https://www.fastprep.io/problems/google-longest-common-parent-directory)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-longest-common-parent-directory)|๐Ÿ†• Oct 09, 2026| |**Hartford Financial Services**|[Second Highest Salary](https://www.fastprep.io/problems/hartford-second-highest-salary)|SQL|[![Practice][p]](https://www.fastprep.io/problems/hartford-second-highest-salary)|๐Ÿ†• Oct 08, 2026| |**Hartford Financial Services**|[Assign Student Grades from CSV Marks](https://www.fastprep.io/problems/hartford-csv-student-grade-assignment)|SQL|[![Practice][p]](https://www.fastprep.io/problems/hartford-csv-student-grade-assignment)|๐Ÿ†• Oct 08, 2026| |**NxtPe**|[Implement Mandate Details and Provider Authentication](https://www.fastprep.io/project-coding/nxtpe-mandate-provider-authentication)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/nxtpe-mandate-provider-authentication)|๐Ÿ†• Oct 08, 2026| |**Sierra**|[Paginate Retained Conversation History](https://www.fastprep.io/problems/sierra-paginate-retained-conversation-history)|Coding|[![Practice][p]](https://www.fastprep.io/problems/sierra-paginate-retained-conversation-history)|๐Ÿ†• Oct 08, 2026| |**Sierra**|[Compact Conversation History by Token Budget](https://www.fastprep.io/problems/sierra-compact-conversation-history-by-token-budget)|Coding|[![Practice][p]](https://www.fastprep.io/problems/sierra-compact-conversation-history-by-token-budget)|๐Ÿ†• Oct 08, 2026| |**Sierra**|[Compact Conversations by Unique Listings](https://www.fastprep.io/problems/sierra-compact-conversations-by-unique-listings)|Coding|[![Practice][p]](https://www.fastprep.io/problems/sierra-compact-conversations-by-unique-listings)|๐Ÿ†• Oct 08, 2026| |**Apple**|[Customer Order Count Distribution by Country](https://www.fastprep.io/problems/apple-customer-order-count-distribution)|SQL|[![Practice][p]](https://www.fastprep.io/problems/apple-customer-order-count-distribution)|๐Ÿ†• Oct 08, 2026| |**Apple**|[iPhone Model Sales Share by Country](https://www.fastprep.io/problems/apple-iphone-model-sales-share)|SQL|[![Practice][p]](https://www.fastprep.io/problems/apple-iphone-model-sales-share)|๐Ÿ†• Oct 08, 2026| |**Apple**|[Top Five Countries by Product Revenue](https://www.fastprep.io/problems/apple-top-five-countries-by-product-revenue)|SQL|[![Practice][p]](https://www.fastprep.io/problems/apple-top-five-countries-by-product-revenue)|๐Ÿ†• Oct 08, 2026| |**Hudson River Trading**|[Best Sprinkler Coordinate for Maximum Coverage](https://www.fastprep.io/problems/hrt-best-sprinkler-coordinate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-best-sprinkler-coordinate)|๐Ÿ†• Oct 08, 2026| |**Hudson River Trading**|[Count Multiples of Three with Two Sevens](https://www.fastprep.io/problems/hrt-count-divisible-numbers-with-two-sevens)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-count-divisible-numbers-with-two-sevens)|๐Ÿ†• Oct 08, 2026| |**Hudson River Trading**|[Rotate Matrix Regions Around the Diagonals](https://www.fastprep.io/problems/hrt-rotate-matrix-over-diagonals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-rotate-matrix-over-diagonals)|๐Ÿ†• Oct 08, 2026| |**Hudson River Trading**|[Recursively Expanded Shell Command Counts](https://www.fastprep.io/problems/hrt-shell-history-command-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-shell-history-command-counts)|๐Ÿ†• Oct 08, 2026| |**OpenAI / The D.E. Shaw Group / Zoox / Salesforce / Kotak Mahindra Bank / Mercor**|[Design an Online Payment Processing System](https://www.fastprep.io/system-design/online-payment-processing-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/online-payment-processing-system)|๐Ÿ†• Oct 08, 2026| |**Bloomberg LP / Microsoft**|[Design a Logging and Data Ingestion System](https://www.fastprep.io/system-design/durable-logging-ingestion-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/durable-logging-ingestion-system)|๐Ÿ†• Oct 08, 2026| |**Google**|[Sliding Window Median of Response Times](https://www.fastprep.io/problems/google-sliding-window-median)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-sliding-window-median)|๐Ÿ†• Oct 08, 2026| |**Google**|[Fountain Safety](https://www.fastprep.io/problems/google-fountain-safety)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-fountain-safety)|๐Ÿ†• Oct 08, 2026| |**Disney Careers**|[Design a Hybrid-Cloud Data Pipeline](https://www.fastprep.io/system-design/hybrid-cloud-data-pipeline)|System design|[![Practice][p]](https://www.fastprep.io/system-design/hybrid-cloud-data-pipeline)|๐Ÿ†• Oct 08, 2026| |**Google**|[Design a Safe Review Summarization Platform](https://www.fastprep.io/system-design/safe-review-summarization-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/safe-review-summarization-platform)|๐Ÿ†• Oct 08, 2026| |**Microsoft**|[Design an Online Tic-Tac-Toe Platform](https://www.fastprep.io/system-design/online-tic-tac-toe-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/online-tic-tac-toe-platform)|๐Ÿ†• Oct 08, 2026| |**OpenAI**|[Online Chess Move Validation](https://www.fastprep.io/problems/openai-online-chess-move-validation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-online-chess-move-validation)|๐Ÿ†• Oct 08, 2026| |**OpenAI**|[Count Friend Circles](https://www.fastprep.io/problems/openai-count-friend-circles)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-count-friend-circles)|๐Ÿ†• Oct 08, 2026| |**OpenAI**|[Plant Infection Simulation, Part 4: Death Countdown](https://www.fastprep.io/problems/openai-infection-simulation-part-4)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-infection-simulation-part-4)|๐Ÿ†• Oct 08, 2026| |**OpenAI**|[Memory Allocator](https://www.fastprep.io/problems/openai-memory-allocator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-memory-allocator)|๐Ÿ†• Oct 08, 2026| |**ZipRecruiter**|[Four-Level Banking System with Scheduled Payments](https://www.fastprep.io/problems/ziprecruiter-scheduled-banking-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ziprecruiter-scheduled-banking-system)|๐Ÿ†• Oct 08, 2026| |**Roblox**|[Centered Block Placement Queries](https://www.fastprep.io/problems/roblox-block-placement-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-block-placement-queries)|๐Ÿ†• Oct 08, 2026| |**Snap Inc.**|[Basic Calculator II](https://www.fastprep.io/problems/snap-inc-basic-calculator-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snap-inc-basic-calculator-ii)|๐Ÿ†• Oct 08, 2026| |**Yahoo**|[Rank Unseen Items by Embedding Similarity](https://www.fastprep.io/problems/yahoo-rank-unseen-items-by-embedding-similarity)|Coding|[![Practice][p]](https://www.fastprep.io/problems/yahoo-rank-unseen-items-by-embedding-similarity)|๐Ÿ†• Oct 08, 2026| |**Applied Intuition**|[Merge Collinear Point Segments](https://www.fastprep.io/problems/applied-intuition-merge-collinear-segments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/applied-intuition-merge-collinear-segments)|๐Ÿ†• Oct 08, 2026| |**Apple**|[Query Weekly Store Opening Hours](https://www.fastprep.io/problems/apple-query-weekly-store-opening-hours)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-query-weekly-store-opening-hours)|๐Ÿ†• Oct 08, 2026| |**Oracle**|[Sum Root-to-Leaf Binary Numbers](https://www.fastprep.io/problems/oracle-sum-root-to-leaf-binary-numbers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-sum-root-to-leaf-binary-numbers)|๐Ÿ†• Oct 08, 2026| |**Bloomberg LP**|[Sparse Vector and Matrix Operations](https://www.fastprep.io/problems/bloomberg-sparse-vector-and-matrix-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bloomberg-sparse-vector-and-matrix-operations)|๐Ÿ†• Oct 08, 2026| |**Lime**|[Merge Intervals](https://www.fastprep.io/problems/lime-merge-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lime-merge-intervals)|๐Ÿ†• Oct 08, 2026| |**Unity**|[ETL Pipeline Scheduler](https://www.fastprep.io/problems/unity-etl-pipeline-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/unity-etl-pipeline-scheduler)|๐Ÿ†• Oct 08, 2026| |**Microsoft**|[Copy a Doubly Linked List with a Special Pointer](https://www.fastprep.io/problems/microsoft-copy-doubly-linked-list-with-special-pointer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-copy-doubly-linked-list-with-special-pointer)|๐Ÿ†• Oct 08, 2026| |**Oracle**|[Remove Adjacent Duplicates in String II](https://www.fastprep.io/problems/oracle-remove-adjacent-duplicates-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-remove-adjacent-duplicates-ii)|๐Ÿ†• Oct 08, 2026| |**Google**|[Reach a Destination Through Scheduled Flights](https://www.fastprep.io/problems/google-reach-destination-scheduled-flights)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-reach-destination-scheduled-flights)|๐Ÿ†• Oct 08, 2026| |**Boston Consulting Group**|[Summarize Taxi Drivers and Rides](https://www.fastprep.io/problems/boston-consulting-group-driver-and-ride-summary)|SQL|[![Practice][p]](https://www.fastprep.io/problems/boston-consulting-group-driver-and-ride-summary)|๐Ÿ†• Oct 08, 2026| |**Boston Consulting Group**|[Build Taxi Driver Performance Features](https://www.fastprep.io/problems/boston-consulting-group-build-taxi-driver-features)|SQL|[![Practice][p]](https://www.fastprep.io/problems/boston-consulting-group-build-taxi-driver-features)|๐Ÿ†• Oct 08, 2026| |**Boston Consulting Group**|[Prepare Taxi Driver Classification Data](https://www.fastprep.io/problems/boston-consulting-group-prepare-driver-classification-data)|SQL|[![Practice][p]](https://www.fastprep.io/problems/boston-consulting-group-prepare-driver-classification-data)|๐Ÿ†• Oct 08, 2026| |**Boston Consulting Group**|[Predict Taxi Driver Classes](https://www.fastprep.io/problems/boston-consulting-group-predict-driver-classes)|SQL|[![Practice][p]](https://www.fastprep.io/problems/boston-consulting-group-predict-driver-classes)|๐Ÿ†• Oct 08, 2026| |**Google**|[Boolean Expression Results After Leaf Flips](https://www.fastprep.io/problems/google-boolean-expression-tree-flip-results)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-boolean-expression-tree-flip-results)|๐Ÿ†• Oct 08, 2026| |**IBM**|[Query Type Frequency Window](https://www.fastprep.io/problems/ibm-query-type-frequency-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-query-type-frequency-window)|๐Ÿ†• Oct 08, 2026| |**Netflix / Oracle / Google / Meta / ByteDance / Astrotalk / LinkedIn / Microsoft**|[Design a Personalized Recommendation System](https://www.fastprep.io/system-design/personalized-recommendation-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/personalized-recommendation-system)|๐Ÿ†• Oct 08, 2026| |**Netflix / FluidStack / DigitalOcean / Nuro / Together AI**|[Design a Machine-Learning Job Scheduler](https://www.fastprep.io/system-design/machine-learning-job-scheduler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/machine-learning-job-scheduler)|๐Ÿ†• Oct 08, 2026| |**OpenAI**|[Minimum-Cost Color Sequence](https://www.fastprep.io/problems/openai-minimum-cost-color-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-minimum-cost-color-sequence)|๐Ÿ†• Oct 08, 2026| |**Amazon**|[Repair the Wallet Loan Marketplace](https://www.fastprep.io/project-coding/repair-wallet-loan-marketplace)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/repair-wallet-loan-marketplace)|๐Ÿ†• Oct 08, 2026| |**Google**|[Validate a Latin Square](https://www.fastprep.io/problems/google-latin-square-validation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-latin-square-validation)|๐Ÿ†• Oct 08, 2026| |**Google**|[Binary Tree Right Side View](https://www.fastprep.io/problems/google-binary-tree-right-side-view)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-binary-tree-right-side-view)|๐Ÿ†• Oct 08, 2026| |**Google**|[Longest Substring Without Repeating Characters](https://www.fastprep.io/problems/google-longest-substring-without-repeating-characters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-longest-substring-without-repeating-characters)|๐Ÿ†• Oct 08, 2026| |**Anthropic**|[Trace Events from Stable Whole-Stack States](https://www.fastprep.io/problems/anthropic-stable-stack-state-trace-events)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-stable-stack-state-trace-events)|๐Ÿ†• Oct 08, 2026| |**Pinterest / OpenAI / Axon / Tesla**|[Design a Blob Storage Service](https://www.fastprep.io/system-design/blob-storage-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/blob-storage-service)|๐Ÿ†• Oct 07, 2026| |**Bloomberg LP / Apple**|[Design Top-K News Articles in a Time Window](https://www.fastprep.io/system-design/top-k-news-arbitrary-window)|System design|[![Practice][p]](https://www.fastprep.io/system-design/top-k-news-arbitrary-window)|๐Ÿ†• Oct 07, 2026| |**ClickUp**|[Design an AI-Powered Search Index](https://www.fastprep.io/system-design/ai-powered-search-index)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ai-powered-search-index)|๐Ÿ†• Oct 07, 2026| |**OpenAI**|[Count Routes Through Four Shop Types](https://www.fastprep.io/problems/openai-count-four-shop-routes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-count-four-shop-routes)|๐Ÿ†• Oct 07, 2026| |**OpenAI**|[Largest Microorganism After Consumption](https://www.fastprep.io/problems/openai-largest-microorganism)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-largest-microorganism)|๐Ÿ†• Oct 07, 2026| |**JP Morgan Chase**|[Maximize Minimum Deployment Difficulty](https://www.fastprep.io/problems/jpmorgan-maximize-minimum-deployment-difficulty)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-maximize-minimum-deployment-difficulty)|๐Ÿ†• Oct 07, 2026| |**Google**|[Count Visible People to the Left](https://www.fastprep.io/problems/google-count-visible-people-to-the-left)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-visible-people-to-the-left)|๐Ÿ†• Oct 07, 2026| |**Verisk**|[Meandering Array](https://www.fastprep.io/problems/verisk-meandering-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/verisk-meandering-array)|๐Ÿ†• Oct 07, 2026| |**Verisk**|[Companies Above a Salary Threshold](https://www.fastprep.io/problems/verisk-companies-above-average-salary-threshold)|SQL|[![Practice][p]](https://www.fastprep.io/problems/verisk-companies-above-average-salary-threshold)|๐Ÿ†• Oct 07, 2026| |**Amazon**|[Longest Increasing Subsequence](https://www.fastprep.io/problems/amazon-longest-increasing-subsequence-variant)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-longest-increasing-subsequence-variant)|๐Ÿ†• Oct 07, 2026| |**Hadrian**|[Work Order Critical Path](https://www.fastprep.io/problems/hadrian-work-order-critical-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hadrian-work-order-critical-path)|๐Ÿ†• Oct 07, 2026| |**Visa**|[Count Valid Space-Delimited Words](https://www.fastprep.io/problems/visa-count-valid-space-delimited-words)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-count-valid-space-delimited-words)|๐Ÿ†• Oct 07, 2026| |**Visa**|[Earliest Common Meeting Start](https://www.fastprep.io/problems/visa-earliest-common-meeting-start)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-earliest-common-meeting-start)|๐Ÿ†• Oct 07, 2026| |**Visa**|[Maximum Index-Weighted Sum with Disjoint Swaps](https://www.fastprep.io/problems/visa-maximum-index-weighted-sum-with-disjoint-swaps)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-maximum-index-weighted-sum-with-disjoint-swaps)|๐Ÿ†• Oct 07, 2026| |**Apple**|[Parse Nested HTML into a Tree](https://www.fastprep.io/problems/apple-html-tree-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-html-tree-parser)|๐Ÿ†• Oct 07, 2026| |**ClickUp**|[Document Edit Events](https://www.fastprep.io/problems/clickup-document-edit-events)|Coding|[![Practice][p]](https://www.fastprep.io/problems/clickup-document-edit-events)|๐Ÿ†• Oct 07, 2026| |**Amazon**|[Minimum Moves to Capture the King](https://www.fastprep.io/problems/amazon-minimum-moves-to-capture-king)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-moves-to-capture-king)|๐Ÿ†• Oct 07, 2026| |**Amazon**|[Concatenated Words](https://www.fastprep.io/problems/amazon-concatenated-words-variant)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-concatenated-words-variant)|๐Ÿ†• Oct 07, 2026| |**Amazon**|[Squirrel Nut Collection Shortest Path](https://www.fastprep.io/problems/amazon-squirrel-nut-collection-shortest-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-squirrel-nut-collection-shortest-path)|๐Ÿ†• Oct 07, 2026| |**OpenAI**|[Chatbot Away-Status Refactor](https://www.fastprep.io/problems/openai-chatbot-away-status-refactor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-chatbot-away-status-refactor)|๐Ÿ†• Oct 07, 2026| |**Apple**|[LRU Cache](https://www.fastprep.io/problems/apple-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-lru-cache)|๐Ÿ†• Oct 07, 2026| |**Atlassian**|[Implement a Rate Limiter](https://www.fastprep.io/problems/atlassian-implement-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/atlassian-implement-rate-limiter)|๐Ÿ†• Oct 07, 2026| |**Kotak Mahindra Bank**|[Design a Restaurant Ordering Domain](https://www.fastprep.io/low-level-design/restaurant-ordering-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/restaurant-ordering-domain)|๐Ÿ†• Oct 07, 2026| |**Amazon / CoreWeave**|[Design Burst-Tolerant Notification Ingestion](https://www.fastprep.io/system-design/burst-tolerant-notification-ingestion)|System design|[![Practice][p]](https://www.fastprep.io/system-design/burst-tolerant-notification-ingestion)|๐Ÿ†• Oct 07, 2026| |**LinkedIn / Confluent / Shield AI / Snap Inc. / OpenAI / Datadog**|[CI/CD Pipeline Orchestration System](https://www.fastprep.io/system-design/ci-cd-pipeline-orchestration-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ci-cd-pipeline-orchestration-system)|๐Ÿ†• Oct 07, 2026| |**CoreWeave**|[Design a Fleet OS Validation State Store](https://www.fastprep.io/system-design/fleet-os-validation-state-store)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fleet-os-validation-state-store)|๐Ÿ†• Oct 07, 2026| |**Rippling**|[Dependency-Aware Task Scheduler](https://www.fastprep.io/problems/rippling-dependency-aware-task-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-dependency-aware-task-scheduler)|๐Ÿ†• Oct 07, 2026| |**Temu**|[Spiral Order with Obstacles](https://www.fastprep.io/problems/temu-spiral-order-with-obstacles)|Coding|[![Practice][p]](https://www.fastprep.io/problems/temu-spiral-order-with-obstacles)|๐Ÿ†• Oct 07, 2026| |**Snap Inc.**|[Stream Cluster Max and Median](https://www.fastprep.io/problems/snap-inc-stream-cluster-max-and-median)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snap-inc-stream-cluster-max-and-median)|๐Ÿ†• Oct 07, 2026| |**Snap Inc.**|[Number of Closed Islands](https://www.fastprep.io/problems/snap-inc-number-of-closed-islands)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snap-inc-number-of-closed-islands)|๐Ÿ†• Oct 07, 2026| |**Snap Inc.**|[Radar Barrier Crossing](https://www.fastprep.io/problems/snap-inc-radar-barrier-crossing)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snap-inc-radar-barrier-crossing)|๐Ÿ†• Oct 07, 2026| |**Google**|[Merge Intervals](https://www.fastprep.io/problems/google-merge-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-merge-intervals)|๐Ÿ†• Oct 07, 2026| |**Google**|[Dynamic Friendship Connectivity](https://www.fastprep.io/problems/google-dynamic-friendship-connectivity)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-dynamic-friendship-connectivity)|๐Ÿ†• Oct 07, 2026| |**Google**|[Running Interval Union Length](https://www.fastprep.io/problems/google-running-interval-union-length)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-running-interval-union-length)|๐Ÿ†• Oct 07, 2026| |**Amazon**|[Find K Pairs with Smallest Sums](https://www.fastprep.io/problems/amazon-k-smallest-pair-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-k-smallest-pair-sums)|๐Ÿ†• Oct 07, 2026| |**AMD**|[Lowest Common Ancestor of a Binary Tree](https://www.fastprep.io/problems/amd-lowest-common-ancestor-binary-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amd-lowest-common-ancestor-binary-tree)|๐Ÿ†• Oct 07, 2026| |**AMD**|[Sort a Binary Array](https://www.fastprep.io/problems/amd-sort-binary-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amd-sort-binary-array)|๐Ÿ†• Oct 07, 2026| |**Infosys**|[Tenth-Highest Distinct Salary](https://www.fastprep.io/problems/infosys-tenth-highest-distinct-salary)|SQL|[![Practice][p]](https://www.fastprep.io/problems/infosys-tenth-highest-distinct-salary)|๐Ÿ†• Oct 07, 2026| |**Kotak Mahindra Bank**|[Longest Common Prefix](https://www.fastprep.io/problems/kotak-longest-common-prefix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-longest-common-prefix)|๐Ÿ†• Oct 07, 2026| |**Kotak Mahindra Bank**|[Search in Rotated Sorted Array](https://www.fastprep.io/problems/kotak-search-in-rotated-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-search-in-rotated-sorted-array)|๐Ÿ†• Oct 07, 2026| |**OpenAI**|[Network Endpoint or Cycle Boundary](https://www.fastprep.io/problems/openai-network-endpoint-or-cycle)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-network-endpoint-or-cycle)|๐Ÿ†• Oct 07, 2026| |**Google**|[Priority-Aware Dependent Task Order](https://www.fastprep.io/problems/google-priority-dependent-task-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-priority-dependent-task-order)|๐Ÿ†• Oct 06, 2026| |**Google**|[Shortest Path Between BST Nodes](https://www.fastprep.io/problems/google-shortest-path-between-bst-nodes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-path-between-bst-nodes)|๐Ÿ†• Oct 06, 2026| |**Google**|[Find the Town Judge](https://www.fastprep.io/problems/google-find-the-town-judge)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-find-the-town-judge)|๐Ÿ†• Oct 06, 2026| |**Google**|[Five-Minute Hit Counter](https://www.fastprep.io/problems/google-five-minute-hit-counter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-five-minute-hit-counter)|๐Ÿ†• Oct 06, 2026| |**Google**|[Top K Video View Counts](https://www.fastprep.io/problems/google-top-k-video-view-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-top-k-video-view-counts)|๐Ÿ†• Oct 06, 2026| |**Microsoft**|[Maximum Alloy Production Within Budget](https://www.fastprep.io/problems/microsoft-maximum-alloy-production)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-maximum-alloy-production)|๐Ÿ†• Oct 06, 2026| |**Microsoft**|[Maximum Interactive Team Size](https://www.fastprep.io/problems/microsoft-maximum-interactive-team-size)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-maximum-interactive-team-size)|๐Ÿ†• Oct 06, 2026| |**OpenAI / Baseten / Amazon**|[Design a Stateless Generative AI Chat Service](https://www.fastprep.io/system-design/stateless-generative-ai-chat-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/stateless-generative-ai-chat-service)|๐Ÿ†• Oct 06, 2026| |**Microsoft**|[Maximum Valid Substring Frequency](https://www.fastprep.io/problems/microsoft-maximum-valid-substring-frequency)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-maximum-valid-substring-frequency)|๐Ÿ†• Oct 06, 2026| |**Microsoft**|[Minimum Non-Adjacent Selection Capability](https://www.fastprep.io/problems/microsoft-minimum-nonadjacent-capability)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-minimum-nonadjacent-capability)|๐Ÿ†• Oct 06, 2026| |**Persona**|[Build an Internal Go-Link Service](https://www.fastprep.io/project-coding/persona-internal-go-links)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/persona-internal-go-links)|๐Ÿ†• Oct 06, 2026| |**NVIDIA**|[Build a System Metrics Reporter](https://www.fastprep.io/project-coding/nvidia-system-metrics-reporter)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/nvidia-system-metrics-reporter)|๐Ÿ†• Oct 06, 2026| |**Ramp**|[Retryable URL Maze](https://www.fastprep.io/problems/ramp-retryable-url-maze)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ramp-retryable-url-maze)|๐Ÿ†• Oct 06, 2026| |**Goldman Sachs**|[Root of the Largest Tree](https://www.fastprep.io/problems/goldman-sachs-largest-tree-root)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-largest-tree-root)|๐Ÿ†• Oct 06, 2026| |**Glean**|[Document Indexer Scheduling Metrics](https://www.fastprep.io/problems/glean-document-indexer-scheduling-metrics)|Coding|[![Practice][p]](https://www.fastprep.io/problems/glean-document-indexer-scheduling-metrics)|๐Ÿ†• Oct 06, 2026| |**Roblox**|[Most Frequent Call Stack Per Thread](https://www.fastprep.io/problems/roblox-most-frequent-call-stack-per-thread)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-most-frequent-call-stack-per-thread)|๐Ÿ†• Oct 06, 2026| |**Goldman Sachs**|[First Non-Repeating Character](https://www.fastprep.io/problems/goldman-sachs-first-non-repeating-character)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-first-non-repeating-character)|๐Ÿ†• Oct 06, 2026| |**Candid Health**|[Callback Signal Registry](https://www.fastprep.io/problems/candid-health-callback-signal-registry)|Coding|[![Practice][p]](https://www.fastprep.io/problems/candid-health-callback-signal-registry)|๐Ÿ†• Oct 06, 2026| |**OpenAI**|[Checkpointed Dynamic Sequence](https://www.fastprep.io/problems/openai-checkpointed-dynamic-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-checkpointed-dynamic-sequence)|๐Ÿ†• Oct 06, 2026| |**ClearTax / Motive / Meesho / Navan / ServiceNow**|[Design a Movie Ticket Booking System](https://www.fastprep.io/low-level-design/movie-ticket-booking-system)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/movie-ticket-booking-system)|๐Ÿ†• Oct 06, 2026| |**SpaceX / Teradata**|[Design a Distributed Real-Time Data Processing Platform](https://www.fastprep.io/system-design/distributed-real-time-data-processing-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-real-time-data-processing-platform)|๐Ÿ†• Oct 06, 2026| |**Uber**|[Design an ML-Assisted Field-Service Evidence Workflow](https://www.fastprep.io/system-design/field-service-evidence-ml-workflow)|System design|[![Practice][p]](https://www.fastprep.io/system-design/field-service-evidence-ml-workflow)|๐Ÿ†• Oct 06, 2026| |**Teradata**|[Design an Organization Knowledge Assistant with Tool Use](https://www.fastprep.io/system-design/organization-knowledge-rag-with-tools)|System design|[![Practice][p]](https://www.fastprep.io/system-design/organization-knowledge-rag-with-tools)|๐Ÿ†• Oct 06, 2026| |**ByteDance**|[Least Recently Used Cache](https://www.fastprep.io/problems/bytedance-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-lru-cache)|๐Ÿ†• Oct 06, 2026| |**Rippling**|[Best and Worst Camel Card Completions](https://www.fastprep.io/problems/rippling-complete-camel-card-hands)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-complete-camel-card-hands)|๐Ÿ†• Oct 06, 2026| |**ByteDance**|[Implement a Heap Priority Queue](https://www.fastprep.io/problems/bytedance-implement-heap-priority-queue)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-implement-heap-priority-queue)|๐Ÿ†• Oct 06, 2026| |**ByteDance**|[Course Schedule](https://www.fastprep.io/problems/bytedance-course-schedule)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-course-schedule)|๐Ÿ†• Oct 06, 2026| |**Uber**|[Find Robots by Blocker Distances](https://www.fastprep.io/problems/uber-find-robots-by-blocker-distances)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-find-robots-by-blocker-distances)|๐Ÿ†• Oct 06, 2026| |**Kotak Mahindra Bank / ServiceNow / PeopleStrong**|[Design a Movie Ticket Booking Platform](https://www.fastprep.io/low-level-design/movie-ticket-booking-platform)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/movie-ticket-booking-platform)|๐Ÿ†• Oct 06, 2026| |**Quince**|[Design an Order and Inventory Coordination Domain](https://www.fastprep.io/low-level-design/order-inventory-coordination-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/order-inventory-coordination-domain)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Container With Most Water](https://www.fastprep.io/problems/epam-container-with-most-water)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-container-with-most-water)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Convert an Entry List to a Map](https://www.fastprep.io/problems/epam-convert-entry-list-to-map)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-convert-entry-list-to-map)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Count Array Element Frequencies](https://www.fastprep.io/problems/epam-count-element-frequencies)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-count-element-frequencies)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Find First and Last Position of Element in Sorted Array](https://www.fastprep.io/problems/epam-find-first-and-last-position)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-find-first-and-last-position)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Group Anagrams](https://www.fastprep.io/problems/epam-group-anagrams)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-group-anagrams)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Longest Consecutive Sequence](https://www.fastprep.io/problems/epam-longest-consecutive-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-longest-consecutive-sequence)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Longest Palindromic Substring](https://www.fastprep.io/problems/epam-longest-palindromic-substring)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-longest-palindromic-substring)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Max Consecutive Ones III](https://www.fastprep.io/problems/epam-max-consecutive-ones-iii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-max-consecutive-ones-iii)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Minimum Currency Conversions](https://www.fastprep.io/problems/epam-minimum-currency-conversions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-minimum-currency-conversions)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Next Greater Element I](https://www.fastprep.io/problems/epam-next-greater-element-i)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-next-greater-element-i)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Partition and Group Values by Parity](https://www.fastprep.io/problems/epam-partition-and-group-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-partition-and-group-values)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Permutations](https://www.fastprep.io/problems/epam-permutations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-permutations)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Second-Highest Distinct Salary](https://www.fastprep.io/problems/epam-second-highest-distinct-salary)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-second-highest-distinct-salary)|๐Ÿ†• Oct 06, 2026| |**EPAM**|[Sort Custom Records](https://www.fastprep.io/problems/epam-sort-custom-records)|Coding|[![Practice][p]](https://www.fastprep.io/problems/epam-sort-custom-records)|๐Ÿ†• Oct 06, 2026| |**HSBC**|[Maximum 69 Number](https://www.fastprep.io/problems/hsbc-maximum-69-number)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hsbc-maximum-69-number)|๐Ÿ†• Oct 06, 2026| |**HSBC**|[Find Maximum Two-Digit Fragment](https://www.fastprep.io/problems/hsbc-maximum-two-digit-fragment)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hsbc-maximum-two-digit-fragment)|๐Ÿ†• Oct 06, 2026| |**HSBC**|[Second Distinct Largest Element](https://www.fastprep.io/problems/hsbc-second-distinct-largest-element)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hsbc-second-distinct-largest-element)|๐Ÿ†• Oct 06, 2026| |**Quince**|[Meeting Rooms II](https://www.fastprep.io/problems/quince-minimum-meeting-rooms)|Coding|[![Practice][p]](https://www.fastprep.io/problems/quince-minimum-meeting-rooms)|๐Ÿ†• Oct 06, 2026| |**ServiceNow**|[LRU Cache](https://www.fastprep.io/problems/service-now-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/service-now-lru-cache)|๐Ÿ†• Oct 06, 2026| |**Teradata**|[Task Scheduler with Cooldown](https://www.fastprep.io/problems/teradata-task-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/teradata-task-scheduler)|๐Ÿ†• Oct 06, 2026| |**Applied Intuition**|[Driving Log Ingestion and Playback Windows](https://www.fastprep.io/project-coding/applied-intuition-driving-log-playback)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/applied-intuition-driving-log-playback)|๐Ÿ†• Oct 06, 2026| |**Google**|[Count Triplets With Sum at Most Target](https://www.fastprep.io/problems/google-count-triplets-with-sum-at-most-target)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-triplets-with-sum-at-most-target)|๐Ÿ†• Oct 06, 2026| |**Google**|[Minimum Number of Chairs](https://www.fastprep.io/problems/google-meeting-rooms-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-meeting-rooms-ii)|๐Ÿ†• Oct 06, 2026| |**Google**|[Advertisement Click Range Sums](https://www.fastprep.io/problems/google-ad-click-range-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-ad-click-range-sums)|๐Ÿ†• Oct 06, 2026| |**Google**|[Reverse a Singly Linked List](https://www.fastprep.io/problems/google-reverse-singly-linked-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-reverse-singly-linked-list)|๐Ÿ†• Oct 06, 2026| |**Amazon**|[Bounded IPv4 Filter](https://www.fastprep.io/problems/amazon-bounded-ipv4-filter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-bounded-ipv4-filter)|๐Ÿ†• Oct 06, 2026| |**Tekion / Autodesk**|[Design a Continuous Table Merge into NoSQL](https://www.fastprep.io/system-design/continuous-table-merge-to-nosql)|System design|[![Practice][p]](https://www.fastprep.io/system-design/continuous-table-merge-to-nosql)|๐Ÿ†• Oct 05, 2026| |**Bloomberg LP**|[Design a Deck, Hand, and Dealer](https://www.fastprep.io/low-level-design/card-game-deck-hand-dealer)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/card-game-deck-hand-dealer)|๐Ÿ†• Oct 05, 2026| |**Walmart**|[Design an Agent-Assisted Search Experience](https://www.fastprep.io/system-design/agentic-search-experience)|System design|[![Practice][p]](https://www.fastprep.io/system-design/agentic-search-experience)|๐Ÿ†• Oct 05, 2026| |**Okta**|[Design Cross-Domain Single Sign-On](https://www.fastprep.io/system-design/cross-domain-single-sign-on)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cross-domain-single-sign-on)|๐Ÿ†• Oct 05, 2026| |**Okta / Paytm**|[Design OIDC Login and Third-Party Tool Authorization](https://www.fastprep.io/system-design/oidc-third-party-tool-authorization)|System design|[![Practice][p]](https://www.fastprep.io/system-design/oidc-third-party-tool-authorization)|๐Ÿ†• Oct 05, 2026| |**Adobe / Airwallex**|[Design Network-Backed Search Suggestions](https://www.fastprep.io/low-level-design/adobe-network-search-suggestions)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/adobe-network-search-suggestions)|๐Ÿ†• Oct 05, 2026| |**Netflix**|[Review and Repair an ML Feature Pipeline PR](https://www.fastprep.io/project-coding/netflix-feature-pipeline-pr-review)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/netflix-feature-pipeline-pr-review)|๐Ÿ†• Oct 05, 2026| |**Stripe**|[Deployment Window Scheduler](https://www.fastprep.io/problems/stripe-deployment-window-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-deployment-window-scheduler)|๐Ÿ†• Oct 05, 2026| |**State Farm**|[Customer Signer Screening](https://www.fastprep.io/problems/state-farm-customer-signer-screening)|Coding|[![Practice][p]](https://www.fastprep.io/problems/state-farm-customer-signer-screening)|๐Ÿ†• Oct 05, 2026| |**Airwallex**|[Named Async Task Scheduler](https://www.fastprep.io/problems/airwallex-named-async-task-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airwallex-named-async-task-scheduler)|๐Ÿ†• Oct 05, 2026| |**Anrok**|[Batched Key Fetch Callbacks](https://www.fastprep.io/problems/anrok-batched-key-fetch-callbacks)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anrok-batched-key-fetch-callbacks)|๐Ÿ†• Oct 05, 2026| |**Micro1 / Amazon / FamPay / Stripe**|[Design an In-Memory Action Rate Limiter](https://www.fastprep.io/low-level-design/in-memory-action-rate-limiter)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-action-rate-limiter)|๐Ÿ†• Oct 05, 2026| |**Expedia / Agoda / Keychain / HackerRank**|[Design a Partner Data Aggregation and Query Service](https://www.fastprep.io/system-design/partner-data-aggregation-and-query-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/partner-data-aggregation-and-query-service)|๐Ÿ†• Oct 05, 2026| |**Citadel / ByteDance / Microsoft / Walmart / ZipRecruiter / SAP / Morgan Stanley**|[Design an Authenticated Shopping Platform](https://www.fastprep.io/system-design/authenticated-shopping-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/authenticated-shopping-platform)|๐Ÿ†• Oct 05, 2026| |**OpenAI / Lokal / Coupang**|[Design a Multi-Channel Bot Notification Service](https://www.fastprep.io/low-level-design/multi-channel-bot-notification-service)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/multi-channel-bot-notification-service)|๐Ÿ†• Oct 05, 2026| |**CoinDCX**|[Design a Crypto Order Matching Engine](https://www.fastprep.io/low-level-design/crypto-order-matching-engine-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/crypto-order-matching-engine-domain)|๐Ÿ†• Oct 05, 2026| |**Lokal**|[Design a Workspace Notification Policy Domain](https://www.fastprep.io/low-level-design/slack-like-notification-policy-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/slack-like-notification-policy-domain)|๐Ÿ†• Oct 05, 2026| |**CoinDCX**|[Count Valleys in a Wiggle Pattern](https://www.fastprep.io/problems/coindcx-count-wiggle-valleys)|Coding|[![Practice][p]](https://www.fastprep.io/problems/coindcx-count-wiggle-valleys)|๐Ÿ†• Oct 05, 2026| |**CoinDCX**|[DFS Subsequences of a String (For MLE)](https://www.fastprep.io/problems/coindcx-generate-all-string-subsequences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/coindcx-generate-all-string-subsequences)|๐Ÿ†• Oct 05, 2026| |**Wonderful**|[Exponential Backoff Delays](https://www.fastprep.io/problems/wonderful-exponential-backoff-delays)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wonderful-exponential-backoff-delays)|๐Ÿ†• Oct 05, 2026| |**Infosys**|[Design a Million-Domain Blocking Service](https://www.fastprep.io/system-design/million-domain-blocking-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/million-domain-blocking-service)|๐Ÿ†• Oct 05, 2026| |**Amazon**|[Design a Distributed Recurring Workflow Scheduler](https://www.fastprep.io/system-design/distributed-recurring-workflow-scheduler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-recurring-workflow-scheduler)|๐Ÿ†• Oct 04, 2026| |**Temporal / Amazon**|[Design Zero-Downtime Database Migration](https://www.fastprep.io/system-design/zero-downtime-database-migration-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/zero-downtime-database-migration-platform)|๐Ÿ†• Oct 04, 2026| |**Salesforce / Amazon**|[Design Movie Subscription Pricing](https://www.fastprep.io/low-level-design/movie-subscription-pricing-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/movie-subscription-pricing-domain)|๐Ÿ†• Oct 04, 2026| |**Tekion / Amazon**|[Design a Workflow Orchestrator Domain](https://www.fastprep.io/low-level-design/workflow-orchestration-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/workflow-orchestration-domain)|๐Ÿ†• Oct 04, 2026| |**Amazon**|[Design a Delivery Estimation Domain](https://www.fastprep.io/low-level-design/delivery-estimation-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/delivery-estimation-domain)|๐Ÿ†• Oct 04, 2026| |**Kotak Mahindra Bank**|[Design an Event Registration Domain](https://www.fastprep.io/low-level-design/event-registration-management-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/event-registration-management-domain)|๐Ÿ†• Oct 04, 2026| |**Amazon**|[Connect N Ropes With Minimum Cost](https://www.fastprep.io/problems/amazon-connect-ropes-minimum-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-connect-ropes-minimum-cost)|๐Ÿ†• Oct 04, 2026| |**Amazon**|[0/1 Knapsack](https://www.fastprep.io/problems/amazon-zero-one-knapsack)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-zero-one-knapsack)|๐Ÿ†• Oct 04, 2026| |**Google**|[Count Axis-Aligned and Rotated Squares](https://www.fastprep.io/problems/google-count-axis-aligned-and-rotated-squares)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-axis-aligned-and-rotated-squares)|๐Ÿ†• Oct 04, 2026| |**Kotak Mahindra Bank**|[Find the Index of the First Occurrence in a String](https://www.fastprep.io/problems/kotak-first-string-occurrence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-first-string-occurrence)|๐Ÿ†• Oct 04, 2026| |**Kotak Mahindra Bank**|[Subarrays Whose Sum Is a Power of Two](https://www.fastprep.io/problems/kotak-power-of-two-sum-subarrays)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-power-of-two-sum-subarrays)|๐Ÿ†• Oct 04, 2026| |**Kotak Mahindra Bank**|[Roman to Integer](https://www.fastprep.io/problems/kotak-roman-to-integer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-roman-to-integer)|๐Ÿ†• Oct 04, 2026| |**Google**|[Minimum Union of Two Routes](https://www.fastprep.io/problems/google-minimum-union-route-edges)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-minimum-union-route-edges)|๐Ÿ†• Oct 03, 2026| |**Microsoft**|[Design a Product Page Sharing and Rewards Platform](https://www.fastprep.io/system-design/product-page-sharing-and-rewards-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/product-page-sharing-and-rewards-platform)|๐Ÿ†• Oct 03, 2026| |**Amazon**|[Design a TTL-Aware LRU Cache](https://www.fastprep.io/low-level-design/ttl-aware-lru-cache-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/ttl-aware-lru-cache-library)|๐Ÿ†• Oct 03, 2026| |**Cohere**|[Enterprise Research Assistant](https://www.fastprep.io/system-design/enterprise-research-assistant)|System design|[![Practice][p]](https://www.fastprep.io/system-design/enterprise-research-assistant)|๐Ÿ†• Oct 03, 2026| |**Grammarly**|[Design a Real-Time Anonymous Pixel Canvas](https://www.fastprep.io/system-design/real-time-anonymous-pixel-canvas)|System design|[![Practice][p]](https://www.fastprep.io/system-design/real-time-anonymous-pixel-canvas)|๐Ÿ†• Oct 03, 2026| |**Qualified Health AI**|[Design a Session-Scoped Document Q&A Agent](https://www.fastprep.io/system-design/session-scoped-document-qa-agent)|System design|[![Practice][p]](https://www.fastprep.io/system-design/session-scoped-document-qa-agent)|๐Ÿ†• Oct 03, 2026| |**Roblox**|[Robot Navigation Around Lasers](https://www.fastprep.io/problems/roblox-laser-robot-safe-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-laser-robot-safe-path)|๐Ÿ†• Oct 03, 2026| |**Amazon**|[Maximize Center A Package Benefit](https://www.fastprep.io/problems/amazon-center-a-package-benefit)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-center-a-package-benefit)|๐Ÿ†• Oct 03, 2026| |**Amazon**|[Max Area of Island](https://www.fastprep.io/problems/amazon-max-area-of-island)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-max-area-of-island)|๐Ÿ†• Oct 03, 2026| |**Amazon**|[Maximum Rating Threshold Count](https://www.fastprep.io/problems/amazon-maximum-rating-threshold-count)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-rating-threshold-count)|๐Ÿ†• Oct 03, 2026| |**Amazon**|[Count Islands from Streaming Rows](https://www.fastprep.io/problems/amazon-streaming-island-count)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-streaming-island-count)|๐Ÿ†• Oct 03, 2026| |**ByteDance**|[Implement a FIFO Queue](https://www.fastprep.io/problems/bytedance-implement-fifo-queue)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-implement-fifo-queue)|๐Ÿ†• Oct 03, 2026| |**Capital One**|[Sort Colors](https://www.fastprep.io/problems/capital-one-sort-colors)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-sort-colors)|๐Ÿ†• Oct 03, 2026| |**Capital One**|[Virtual Card Transaction Validator](https://www.fastprep.io/problems/capital-one-virtual-card-transaction-validator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-virtual-card-transaction-validator)|๐Ÿ†• Oct 03, 2026| |**Google**|[Basic In-Memory Spreadsheet](https://www.fastprep.io/problems/google-in-memory-spreadsheet)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-in-memory-spreadsheet)|๐Ÿ†• Oct 03, 2026| |**Hudson River Trading**|[Maximum Diamond Sum](https://www.fastprep.io/problems/hudson-river-trading-maximum-diamond-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hudson-river-trading-maximum-diamond-sum)|๐Ÿ†• Oct 03, 2026| |**Hudson River Trading**|[Smallest Most-Lit Street Position](https://www.fastprep.io/problems/hudson-river-trading-most-lit-position)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hudson-river-trading-most-lit-position)|๐Ÿ†• Oct 03, 2026| |**Hudson River Trading**|[Tilting Maze Ball](https://www.fastprep.io/problems/hudson-river-trading-tilting-maze-ball)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hudson-river-trading-tilting-maze-ball)|๐Ÿ†• Oct 03, 2026| |**JP Morgan Chase**|[Substring Removal](https://www.fastprep.io/problems/jpmorgan-get-min-length)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-get-min-length)|๐Ÿ†• Oct 03, 2026| |**Microsoft**|[Count Nondecreasing Digit-Sum Arrays](https://www.fastprep.io/problems/microsoft-count-nondecreasing-digit-sum-arrays)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-count-nondecreasing-digit-sum-arrays)|๐Ÿ†• Oct 03, 2026| |**LiveKit / Google**|[AI Support Agent with Guarded Refunds](https://www.fastprep.io/system-design/ai-support-agent-with-guarded-refunds)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ai-support-agent-with-guarded-refunds)|๐Ÿ†• Oct 03, 2026| |**Salesforce / American Express / Booking.com / Capital One**|[Design a Goal-Driven Tool-Using Agent](https://www.fastprep.io/system-design/goal-driven-tool-using-agent)|System design|[![Practice][p]](https://www.fastprep.io/system-design/goal-driven-tool-using-agent)|๐Ÿ†• Oct 03, 2026| |**Arista Networks**|[First Missing Number in a Consecutive Array](https://www.fastprep.io/problems/arista-networks-first-missing-number-in-consecutive-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/arista-networks-first-missing-number-in-consecutive-array)|๐Ÿ†• Oct 03, 2026| |**AMD**|[Predict Runtime Method Dispatch](https://www.fastprep.io/problems/amd-runtime-method-dispatch-output)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amd-runtime-method-dispatch-output)|๐Ÿ†• Oct 03, 2026| |**Arista Networks**|[Trace Nested Object Destruction Order](https://www.fastprep.io/problems/arista-object-lifetime-destruction-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/arista-object-lifetime-destruction-order)|๐Ÿ†• Oct 03, 2026| |**Arista Networks**|[Remove All Repeated Values from a Linked List](https://www.fastprep.io/problems/arista-remove-all-repeated-linked-list-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/arista-remove-all-repeated-linked-list-values)|๐Ÿ†• Oct 03, 2026| |**Google**|[Rat's Safest Path](https://www.fastprep.io/problems/google-rat-safest-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-rat-safest-path)|๐Ÿ†• Oct 03, 2026| |**Micron Technology**|[Minimum Difference Between Two Clock Times](https://www.fastprep.io/problems/micron-minimum-clock-time-difference)|Coding|[![Practice][p]](https://www.fastprep.io/problems/micron-minimum-clock-time-difference)|๐Ÿ†• Oct 03, 2026| |**Google**|[Trace Every Water Drop to Its Resting Destination](https://www.fastprep.io/problems/google-water-drop-resting-destinations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-water-drop-resting-destinations)|๐Ÿ†• Oct 03, 2026| |**Google**|[Longest Dictionary Word from Nine Letters](https://www.fastprep.io/problems/google-longest-word-from-nine-letters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-longest-word-from-nine-letters)|๐Ÿ†• Oct 03, 2026| |**Apple**|[Days Until Poisoned Plants Stabilize](https://www.fastprep.io/problems/apple-poisoned-plants-stabilization)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-poisoned-plants-stabilization)|๐Ÿ†• Oct 02, 2026| |**Cisco**|[Todo Task Manager Operations](https://www.fastprep.io/problems/cisco-todo-task-manager-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cisco-todo-task-manager-operations)|๐Ÿ†• Oct 02, 2026| |**DocuSign**|[Union Area of Two Rectangles](https://www.fastprep.io/problems/docusign-rectangle-union-area)|Coding|[![Practice][p]](https://www.fastprep.io/problems/docusign-rectangle-union-area)|๐Ÿ†• Oct 02, 2026| |**DocuSign**|[Symmetric Binary Tree](https://www.fastprep.io/problems/docusign-symmetric-binary-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/docusign-symmetric-binary-tree)|๐Ÿ†• Oct 02, 2026| |**ElevenLabs**|[Lowest-Cost Shirt Color Schedule](https://www.fastprep.io/problems/elevenlabs-lowest-cost-shirt-colors)|Coding|[![Practice][p]](https://www.fastprep.io/problems/elevenlabs-lowest-cost-shirt-colors)|๐Ÿ†• Oct 02, 2026| |**ElevenLabs**|[Minimum Magic Stones After Merges](https://www.fastprep.io/problems/elevenlabs-minimum-magic-stones)|Coding|[![Practice][p]](https://www.fastprep.io/problems/elevenlabs-minimum-magic-stones)|๐Ÿ†• Oct 02, 2026| |**ElevenLabs**|[Next Number with Disjoint Digits](https://www.fastprep.io/problems/elevenlabs-next-number-with-disjoint-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/elevenlabs-next-number-with-disjoint-digits)|๐Ÿ†• Oct 02, 2026| |**FurtherAI**|[Merge Overlapping Intervals](https://www.fastprep.io/problems/furtherai-merge-overlapping-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/furtherai-merge-overlapping-intervals)|๐Ÿ†• Oct 02, 2026| |**FurtherAI**|[Workflow Service Operations](https://www.fastprep.io/problems/furtherai-workflow-service-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/furtherai-workflow-service-operations)|๐Ÿ†• Oct 02, 2026| |**Jane Street**|[Exact-Sixty Dice Game Value](https://www.fastprep.io/problems/jane-street-exact-sixty-dice-game)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-exact-sixty-dice-game)|๐Ÿ†• Oct 02, 2026| |**Jane Street**|[Expected Value of Modified Dice](https://www.fastprep.io/problems/jane-street-modified-dice-expected-value)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-modified-dice-expected-value)|๐Ÿ†• Oct 02, 2026| |**Jane Street**|[Spaceship Equipment Loadout](https://www.fastprep.io/problems/jane-street-spaceship-equipment-loadout)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-spaceship-equipment-loadout)|๐Ÿ†• Oct 02, 2026| |**Jane Street**|[Two-Tower Strategy Game](https://www.fastprep.io/problems/jane-street-two-tower-strategy-game)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-two-tower-strategy-game)|๐Ÿ†• Oct 02, 2026| |**Jane Street**|[Wizard Scroll Allocation Strategy](https://www.fastprep.io/problems/jane-street-wizard-scroll-strategy)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jane-street-wizard-scroll-strategy)|๐Ÿ†• Oct 02, 2026| |**Otter.ai**|[Minimum Operations to Make Every Array Element One](https://www.fastprep.io/problems/otter-minimum-operations-make-array-one)|Coding|[![Practice][p]](https://www.fastprep.io/problems/otter-minimum-operations-make-array-one)|๐Ÿ†• Oct 02, 2026| |**Patreon**|[Sliding-Window API Rate Limiter](https://www.fastprep.io/problems/patreon-sliding-window-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/patreon-sliding-window-rate-limiter)|๐Ÿ†• Oct 02, 2026| |**Valon**|[Progressive Banking Service Operations](https://www.fastprep.io/problems/valon-progressive-banking-service-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/valon-progressive-banking-service-operations)|๐Ÿ†• Oct 02, 2026| |**Pinecone**|[Set Matrix Zeroes](https://www.fastprep.io/problems/pinecone-set-matrix-zeroes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinecone-set-matrix-zeroes)|๐Ÿ†• Oct 02, 2026| |**Pinecone**|[Minimum Binary String Length After Pair Removals](https://www.fastprep.io/problems/pinecone-minimum-binary-string-after-removals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinecone-minimum-binary-string-after-removals)|๐Ÿ†• Oct 02, 2026| |**Pinecone**|[Tic-Tac-Toe Board Status](https://www.fastprep.io/problems/pinecone-tic-tac-toe-status)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinecone-tic-tac-toe-status)|๐Ÿ†• Oct 02, 2026| |**Pinecone**|[Binary Tree Right View](https://www.fastprep.io/problems/pinecone-binary-tree-right-view)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinecone-binary-tree-right-view)|๐Ÿ†• Oct 02, 2026| |**Pinterest / DoorDash / Patreon**|[Design an Ad Event Measurement Platform](https://www.fastprep.io/system-design/ad-event-measurement-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ad-event-measurement-platform)|๐Ÿ†• Oct 02, 2026| |**Moveworks / Coupang**|[Design Read-Only Review Keyword Search](https://www.fastprep.io/system-design/read-only-review-keyword-search-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/read-only-review-keyword-search-platform)|๐Ÿ†• Oct 02, 2026| |**Pinterest / Instacart / Amazon / Coupa Software / Visa**|[Design an Inventory Management Service](https://www.fastprep.io/system-design/inventory-management-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/inventory-management-service)|๐Ÿ†• Oct 02, 2026| |**Roblox**|[Design a Notification Center](https://www.fastprep.io/system-design/notification-center-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/notification-center-system)|๐Ÿ†• Oct 02, 2026| |**Applied Intuition**|[Design a Real-Time 3D Log Playback System](https://www.fastprep.io/system-design/real-time-3d-log-playback-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/real-time-3d-log-playback-system)|๐Ÿ†• Oct 02, 2026| |**Rippling**|[Design an Email Package Tracking Widget](https://www.fastprep.io/system-design/email-package-tracking-widget)|System design|[![Practice][p]](https://www.fastprep.io/system-design/email-package-tracking-widget)|๐Ÿ†• Oct 02, 2026| |**Roblox**|[Design an Image Feed](https://www.fastprep.io/system-design/image-feed-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/image-feed-system)|๐Ÿ†• Oct 02, 2026| |**Zip**|[Repair Monthly Expense Attribution](https://www.fastprep.io/project-coding/zip-repair-monthly-expense-attribution)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/zip-repair-monthly-expense-attribution)|๐Ÿ†• Oct 02, 2026| |**Capital One**|[Find a Symbolic Matrix Pattern](https://www.fastprep.io/problems/capital-one-symbolic-matrix-pattern)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-symbolic-matrix-pattern)|๐Ÿ†• Oct 02, 2026| |**Capital One**|[Sorted Cyclic Shift Difference Sums](https://www.fastprep.io/problems/capital-one-cyclic-shift-absolute-difference-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-cyclic-shift-absolute-difference-sums)|๐Ÿ†• Oct 02, 2026| |**Capital One**|[First Value Below Both Neighbors](https://www.fastprep.io/problems/capital-one-first-value-below-both-neighbors)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-first-value-below-both-neighbors)|๐Ÿ†• Oct 02, 2026| |**Capital One**|[Forward Block Placement Queries](https://www.fastprep.io/problems/capital-one-forward-block-placement-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-forward-block-placement-queries)|๐Ÿ†• Oct 02, 2026| |**OpenAI**|[Incremental Hard Attention with a KV Cache](https://www.fastprep.io/problems/openai-cached-causal-hard-attention)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-cached-causal-hard-attention)|๐Ÿ†• Oct 02, 2026| |**OpenAI**|[Design and Implement an Extensible Three-Card Hand Evaluator](https://www.fastprep.io/low-level-design/extensible-three-card-hand-evaluator)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/extensible-three-card-hand-evaluator)|๐Ÿ†• Oct 02, 2026| |**Dell Technologies**|[Design and Implement a Hash Map](https://www.fastprep.io/low-level-design/test-driven-hash-map)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/test-driven-hash-map)|๐Ÿ†• Oct 02, 2026| |**Microsoft**|[Design and Implement an Attack-Path Graph Domain](https://www.fastprep.io/low-level-design/attack-path-graph-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/attack-path-graph-domain)|๐Ÿ†• Oct 02, 2026| |**Amazon**|[Maximize K-Element AND with an Increment Budget](https://www.fastprep.io/problems/amazon-maximize-k-element-and-with-increment-budget)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximize-k-element-and-with-increment-budget)|๐Ÿ†• Oct 02, 2026| |**Cockroach Labs**|[Time-Based Key-Value Store](https://www.fastprep.io/problems/cockroach-labs-time-based-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cockroach-labs-time-based-key-value-store)|๐Ÿ†• Oct 02, 2026| |**Google**|[Maximize the Chance of Selecting the Best Candidate](https://www.fastprep.io/problems/google-maximize-best-candidate-selection-chance)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-maximize-best-candidate-selection-chance)|๐Ÿ†• Oct 02, 2026| |**Google**|[Two Sum](https://www.fastprep.io/problems/google-two-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-two-sum)|๐Ÿ†• Oct 02, 2026| |**Microsoft**|[K-Second Message Suppression](https://www.fastprep.io/problems/microsoft-k-second-message-suppression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-k-second-message-suppression)|๐Ÿ†• Oct 02, 2026| |**Microsoft**|[Max Consecutive Ones III](https://www.fastprep.io/problems/microsoft-max-consecutive-ones-k-flips)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-max-consecutive-ones-k-flips)|๐Ÿ†• Oct 02, 2026| |**Microsoft**|[Amount of Time to Infect a Tree](https://www.fastprep.io/problems/microsoft-minimum-time-to-burn-binary-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-minimum-time-to-burn-binary-tree)|๐Ÿ†• Oct 02, 2026| |**Optimus Information**|[Compute Areas Through an Abstract Shape Type](https://www.fastprep.io/problems/optimus-information-abstract-shape-areas)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optimus-information-abstract-shape-areas)|๐Ÿ†• Oct 02, 2026| |**Optimus Information**|[Apply Overridden Integer Transforms](https://www.fastprep.io/problems/optimus-information-function-overriding)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optimus-information-function-overriding)|๐Ÿ†• Oct 02, 2026| |**Optimus Information**|[N-Queens Solution Count](https://www.fastprep.io/problems/optimus-information-n-queens-count)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optimus-information-n-queens-count)|๐Ÿ†• Oct 02, 2026| |**Optimus Information**|[3Sum](https://www.fastprep.io/problems/optimus-information-three-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optimus-information-three-sum)|๐Ÿ†• Oct 02, 2026| |**Optimus Information**|[Two Sum](https://www.fastprep.io/problems/optimus-information-two-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optimus-information-two-sum)|๐Ÿ†• Oct 02, 2026| |**Optimus Information**|[Dispatch Virtual Shipping Prices](https://www.fastprep.io/problems/optimus-information-virtual-pricing-function)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optimus-information-virtual-pricing-function)|๐Ÿ†• Oct 02, 2026| |**Oracle**|[Longest All-Present Attendance Streak](https://www.fastprep.io/problems/oracle-longest-all-present-streak)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-longest-all-present-streak)|๐Ÿ†• Oct 02, 2026| |**Capital One**|[Summarize Taxi Drivers and Rides](https://www.fastprep.io/problems/capital-one-driver-and-ride-summary)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-driver-and-ride-summary)|๐Ÿ†• Oct 01, 2026| |**Capital One**|[Build Taxi Driver Performance Features](https://www.fastprep.io/problems/capital-one-build-taxi-driver-features)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-build-taxi-driver-features)|๐Ÿ†• Oct 01, 2026| |**Capital One**|[Prepare Taxi Driver Classification Data](https://www.fastprep.io/problems/capital-one-prepare-driver-classification-data)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-prepare-driver-classification-data)|๐Ÿ†• Oct 01, 2026| |**Capital One**|[Predict Taxi Driver Classes](https://www.fastprep.io/problems/capital-one-predict-driver-classes)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-predict-driver-classes)|๐Ÿ†• Oct 01, 2026| |**Microsoft**|[K Most Recent Unique Request IDs](https://www.fastprep.io/problems/microsoft-k-most-recent-unique-request-ids)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-k-most-recent-unique-request-ids)|๐Ÿ†• Oct 01, 2026| |**Microsoft**|[Shortest Board Length to Cover Holes](https://www.fastprep.io/problems/microsoft-cover-holes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-cover-holes)|๐Ÿ†• Oct 01, 2026| |**Microsoft**|[Prepare Notification](https://www.fastprep.io/problems/microsoft-prepare-notification)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-prepare-notification)|๐Ÿ†• Oct 01, 2026| |**Amazon**|[Minimum Merge Conflicts](https://www.fastprep.io/problems/amazon-minimum-merge-conflicts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-merge-conflicts)|๐Ÿ†• Oct 01, 2026| |**Waymo / Nuro**|[Design a Distributed Simulation Platform](https://www.fastprep.io/system-design/distributed-simulation-job-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-simulation-job-platform)|๐Ÿ†• Oct 01, 2026| |**LinkedIn**|[Design a Job-Click Prediction Platform](https://www.fastprep.io/system-design/job-click-prediction-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/job-click-prediction-platform)|๐Ÿ†• Oct 01, 2026| |**Microsoft**|[Design an Employee Attrition Risk Platform](https://www.fastprep.io/system-design/employee-attrition-risk-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/employee-attrition-risk-platform)|๐Ÿ†• Oct 01, 2026| |**Bloomberg LP / Uber**|[Design a Real-Time Stock Alert System](https://www.fastprep.io/system-design/configurable-real-time-stock-alerts)|System design|[![Practice][p]](https://www.fastprep.io/system-design/configurable-real-time-stock-alerts)|๐Ÿ†• Oct 01, 2026| |**Uber**|[Design and Implement a Social News Feed Domain](https://www.fastprep.io/low-level-design/social-news-feed-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/social-news-feed-domain)|๐Ÿ†• Oct 01, 2026| |**HyperVerge**|[Design a High-Throughput Reminder Delivery Platform](https://www.fastprep.io/system-design/high-throughput-reminder-delivery-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/high-throughput-reminder-delivery-platform)|๐Ÿ†• Oct 01, 2026| |**Amazon**|[Next Smaller Ticket Price](https://www.fastprep.io/problems/amazon-next-smaller-ticket-price)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-next-smaller-ticket-price)|๐Ÿ†• Oct 01, 2026| |**Amazon**|[Parking Garage Allocator](https://www.fastprep.io/problems/amazon-parking-garage-allocator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-parking-garage-allocator)|๐Ÿ†• Oct 01, 2026| |**Amazon**|[Tallest Billboard](https://www.fastprep.io/problems/amazon-tallest-billboard)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-tallest-billboard)|๐Ÿ†• Oct 01, 2026| |**Coupang**|[LRU Cache](https://www.fastprep.io/problems/coupang-linked-list-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/coupang-linked-list-lru-cache)|๐Ÿ†• Oct 01, 2026| |**HyperVerge**|[Find the Missing Number from 1 to n](https://www.fastprep.io/problems/hyperverge-missing-number)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hyperverge-missing-number)|๐Ÿ†• Oct 01, 2026| |**Uber**|[Longest Continuous Subarray Within an Absolute-Difference Limit](https://www.fastprep.io/problems/uber-longest-continuous-subarray-with-limit)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-longest-continuous-subarray-with-limit)|๐Ÿ†• Oct 01, 2026| |**Uber**|[Sliding-Window Rate Limiter](https://www.fastprep.io/problems/uber-sliding-window-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-sliding-window-rate-limiter)|๐Ÿ†• Oct 01, 2026| |**Wise**|[Meeting Rooms II](https://www.fastprep.io/problems/wise-maximum-meeting-rooms)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wise-maximum-meeting-rooms)|๐Ÿ†• Oct 01, 2026| |**Crowdstrike**|[Risk-Priority Detection Store](https://www.fastprep.io/problems/crowdstrike-risk-priority-detection-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/crowdstrike-risk-priority-detection-store)|๐Ÿ†• Sep 30, 2026| |**Google**|[Zero Array Transformation I](https://www.fastprep.io/problems/google-zero-array-transformation-i)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-zero-array-transformation-i)|๐Ÿ†• Sep 30, 2026| |**Amazon**|[Optimize Package Order by Sorting One Window](https://www.fastprep.io/problems/amazon-optimize-package-order-one-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-optimize-package-order-one-window)|๐Ÿ†• Sep 30, 2026| |**Applied Intuition**|[Parse Nested Message Types](https://www.fastprep.io/problems/applied-intuition-parse-nested-message-types)|Coding|[![Practice][p]](https://www.fastprep.io/problems/applied-intuition-parse-nested-message-types)|๐Ÿ†• Sep 30, 2026| |**Faire**|[Find the First Contiguous Haiku](https://www.fastprep.io/problems/faire-first-contiguous-haiku)|Coding|[![Practice][p]](https://www.fastprep.io/problems/faire-first-contiguous-haiku)|๐Ÿ†• Sep 30, 2026| |**Google**|[Calculator with Parentheses](https://www.fastprep.io/problems/google-calculator-with-parentheses)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-calculator-with-parentheses)|๐Ÿ†• Sep 30, 2026| |**Google**|[Search a File Collection](https://www.fastprep.io/problems/google-file-collection-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-file-collection-search)|๐Ÿ†• Sep 30, 2026| |**Google**|[Count Islands After Land Additions](https://www.fastprep.io/problems/google-island-counts-after-land-additions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-island-counts-after-land-additions)|๐Ÿ†• Sep 30, 2026| |**Google**|[Number of Islands](https://www.fastprep.io/problems/google-number-of-islands)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-number-of-islands)|๐Ÿ†• Sep 30, 2026| |**Google**|[Shortest Deletion for a Distinct Remainder](https://www.fastprep.io/problems/google-shortest-deletion-distinct-remainder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-deletion-distinct-remainder)|๐Ÿ†• Sep 30, 2026| |**Meta**|[Shortest Path in a Binary Matrix](https://www.fastprep.io/problems/meta-shortest-path-binary-matrix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-shortest-path-binary-matrix)|๐Ÿ†• Sep 30, 2026| |**Microsoft**|[Greedy and Beam Sentence Decoding](https://www.fastprep.io/problems/microsoft-greedy-and-beam-sentence-decoding)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-greedy-and-beam-sentence-decoding)|๐Ÿ†• Sep 30, 2026| |**The Voleon Group**|[Best-Fit Plane Normal from 3D Points](https://www.fastprep.io/problems/the-voleon-group-best-fit-plane-normal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/the-voleon-group-best-fit-plane-normal)|๐Ÿ†• Sep 30, 2026| |**Virtu Financial**|[Maximum Barbell Weight](https://www.fastprep.io/problems/virtu-financial-maximum-barbell-weight)|Coding|[![Practice][p]](https://www.fastprep.io/problems/virtu-financial-maximum-barbell-weight)|๐Ÿ†• Sep 30, 2026| |**Virtu Financial**|[Maximum Sum of Heights](https://www.fastprep.io/problems/virtu-financial-maximum-sum-of-heights)|Coding|[![Practice][p]](https://www.fastprep.io/problems/virtu-financial-maximum-sum-of-heights)|๐Ÿ†• Sep 30, 2026| |**Virtu Financial**|[Optimal Account Balancing](https://www.fastprep.io/problems/virtu-financial-optimal-account-balancing)|Coding|[![Practice][p]](https://www.fastprep.io/problems/virtu-financial-optimal-account-balancing)|๐Ÿ†• Sep 30, 2026| |**Virtu Financial**|[Reaching Points](https://www.fastprep.io/problems/virtu-financial-reaching-points)|Coding|[![Practice][p]](https://www.fastprep.io/problems/virtu-financial-reaching-points)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Leftmost Memory Block Allocator (for mle also :)](https://www.fastprep.io/problems/tiktok-leftmost-memory-block-allocator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-leftmost-memory-block-allocator)|๐Ÿ†• Sep 30, 2026| |**Rippling**|[Token Validation](https://www.fastprep.io/problems/rippling-token-validation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-token-validation)|๐Ÿ†• Sep 30, 2026| |**Rippling**|[REST API: Highest International Students](https://www.fastprep.io/problems/rippling-highest-international-students)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-highest-international-students)|๐Ÿ†• Sep 30, 2026| |**Rippling**|[Server Investment](https://www.fastprep.io/problems/rippling-server-investment)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-server-investment)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Cyclic Shift to a Reverse-Sorted Array](https://www.fastprep.io/problems/tiktok-cyclic-shift-to-reverse-sorted)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-cyclic-shift-to-reverse-sorted)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Count Coordinates Illuminated by Exactly One Lamp](https://www.fastprep.io/problems/tiktok-count-coordinates-illuminated-by-exactly-one-lamp)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-coordinates-illuminated-by-exactly-one-lamp)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Sort Matrix Borders](https://www.fastprep.io/problems/tiktok-sort-matrix-borders)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-sort-matrix-borders)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Count Even-Digit Numbers](https://www.fastprep.io/problems/tiktok-count-even-digit-numbers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-even-digit-numbers)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Rectangle Fit Queries](https://www.fastprep.io/problems/tiktok-rectangle-fit-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-rectangle-fit-queries)|๐Ÿ†• Sep 30, 2026| |**TikTok**|[Construct WDL String](https://www.fastprep.io/problems/tiktok-construct-wdl-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-construct-wdl-string)|๐Ÿ†• Sep 30, 2026| |**Google**|[Design a Manufacturing Operations Agent](https://www.fastprep.io/system-design/manufacturing-operations-agent)|System design|[![Practice][p]](https://www.fastprep.io/system-design/manufacturing-operations-agent)|๐Ÿ†• Sep 30, 2026| |**Wells Fargo / Okta**|[Cursor-Paginated Records Service](https://www.fastprep.io/system-design/cursor-paginated-records-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cursor-paginated-records-service)|๐Ÿ†• Sep 30, 2026| |**Okta**|[Design a Production Paginated Record API](https://www.fastprep.io/system-design/production-paginated-record-api)|System design|[![Practice][p]](https://www.fastprep.io/system-design/production-paginated-record-api)|๐Ÿ†• Sep 30, 2026| |**General Motors**|[Design a Resilient Dependency-Orchestrating Service](https://www.fastprep.io/system-design/resilient-dependency-orchestrating-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resilient-dependency-orchestrating-service)|๐Ÿ†• Sep 30, 2026| |**BNSF Railway / Hartford Financial Services**|[Design a Resilient High-Traffic Quote API](https://www.fastprep.io/system-design/resilient-high-traffic-quote-api)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resilient-high-traffic-quote-api)|๐Ÿ†• Sep 30, 2026| |**Stripe**|[Request Routing System](https://www.fastprep.io/problems/stripe-request-routing-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-request-routing-system)|๐Ÿ†• Sep 30, 2026| |**Capital One**|[Digit-Coded Card Validation](https://www.fastprep.io/problems/capital-one-digit-coded-card-validation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-digit-coded-card-validation)|๐Ÿ†• Sep 30, 2026| |**Ramp**|[Accept or Decline Queries](https://www.fastprep.io/problems/ramp-accept-or-decline-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ramp-accept-or-decline-queries)|๐Ÿ†• Sep 30, 2026| |**BNSF Railway**|[Implement a Railway Quote Service Layer](https://www.fastprep.io/project-coding/bnsf-railway-quote-service-layer)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/bnsf-railway-quote-service-layer)|๐Ÿ†• Sep 30, 2026| |**Google**|[Target Interval Conflict](https://www.fastprep.io/problems/google-target-interval-conflict)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-target-interval-conflict)|๐Ÿ†• Sep 30, 2026| |**Google**|[Word Break](https://www.fastprep.io/problems/google-word-break)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-word-break)|๐Ÿ†• Sep 30, 2026| |**Google**|[K Closest Stars from a Data Stream](https://www.fastprep.io/problems/google-k-closest-stars-stream)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-k-closest-stars-stream)|๐Ÿ†• Sep 30, 2026| |**Google**|[N-Ary Tree BFS Codec](https://www.fastprep.io/problems/google-nary-tree-bfs-codec)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-nary-tree-bfs-codec)|๐Ÿ†• Sep 30, 2026| |**Google**|[Design and Implement a Concurrent Priority Task Scheduler](https://www.fastprep.io/low-level-design/concurrent-priority-timeout-task-scheduler)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/concurrent-priority-timeout-task-scheduler)|๐Ÿ†• Sep 30, 2026| |**Google**|[Minimum Direction Violations](https://www.fastprep.io/problems/google-minimum-direction-violations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-minimum-direction-violations)|๐Ÿ†• Sep 30, 2026| |**GoodScore / amo**|[Design and Implement a Thread-Safe In-Memory Task Queue](https://www.fastprep.io/low-level-design/thread-safe-in-memory-task-queue)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/thread-safe-in-memory-task-queue)|๐Ÿ†• Sep 30, 2026| |**Bloomberg LP / amo**|[Design Daily Database Query and Email Delivery](https://www.fastprep.io/system-design/daily-database-query-email-delivery)|System design|[![Practice][p]](https://www.fastprep.io/system-design/daily-database-query-email-delivery)|๐Ÿ†• Sep 30, 2026| |**Urban Company**|[Design and Implement Partner Slot Routing](https://www.fastprep.io/low-level-design/partner-customer-slot-routing-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/partner-customer-slot-routing-domain)|๐Ÿ†• Sep 30, 2026| |**Navi**|[Design a Metro and Bus Booking Platform](https://www.fastprep.io/system-design/multimodal-transit-booking-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multimodal-transit-booking-platform)|๐Ÿ†• Sep 30, 2026| |**amo**|[Design a Time-Zone-Aware Birthday Notification Service](https://www.fastprep.io/system-design/timezone-aware-birthday-notification-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/timezone-aware-birthday-notification-service)|๐Ÿ†• Sep 30, 2026| |**amo**|[Design a Concurrent Multi-Producer Multi-Consumer Queue](https://www.fastprep.io/low-level-design/concurrent-mpmc-queue-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/concurrent-mpmc-queue-domain)|๐Ÿ†• Sep 30, 2026| |**Navi**|[Design and Implement a Shared Expense Tracker](https://www.fastprep.io/low-level-design/shared-expense-tracker-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/shared-expense-tracker-domain)|๐Ÿ†• Sep 30, 2026| |**amo**|[Delimiter-Parsing String Iterator](https://www.fastprep.io/problems/amo-delimiter-string-iterator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amo-delimiter-string-iterator)|๐Ÿ†• Sep 30, 2026| |**Atlassian**|[Longest Consistent Activity Streak](https://www.fastprep.io/problems/atlassian-longest-consistent-activity-streak)|Coding|[![Practice][p]](https://www.fastprep.io/problems/atlassian-longest-consistent-activity-streak)|๐Ÿ†• Sep 30, 2026| |**Navi**|[Find K Closest Elements in a Sorted Array](https://www.fastprep.io/problems/navi-find-k-closest-elements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/navi-find-k-closest-elements)|๐Ÿ†• Sep 30, 2026| |**Navi**|[Jump Game II](https://www.fastprep.io/problems/navi-jump-game-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/navi-jump-game-ii)|๐Ÿ†• Sep 30, 2026| |**Paytm**|[Find First and Last Position in Sorted Array](https://www.fastprep.io/problems/paytm-first-and-last-target-positions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/paytm-first-and-last-target-positions)|๐Ÿ†• Sep 30, 2026| |**Paytm**|[Detect a Linked-List Cycle](https://www.fastprep.io/problems/paytm-linked-list-cycle)|Coding|[![Practice][p]](https://www.fastprep.io/problems/paytm-linked-list-cycle)|๐Ÿ†• Sep 30, 2026| |**Paytm**|[Minimum Coins for a Target](https://www.fastprep.io/problems/paytm-minimum-coins-for-target)|Coding|[![Practice][p]](https://www.fastprep.io/problems/paytm-minimum-coins-for-target)|๐Ÿ†• Sep 30, 2026| |**Securonix**|[Meeting Rooms II](https://www.fastprep.io/problems/securonix-minimum-meeting-rooms)|Coding|[![Practice][p]](https://www.fastprep.io/problems/securonix-minimum-meeting-rooms)|๐Ÿ†• Sep 30, 2026| |**Amazon**|[Repair MovieDB Search and Recommendations](https://www.fastprep.io/project-coding/amazon-repair-moviedb-recommendations)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/amazon-repair-moviedb-recommendations)|๐Ÿ†• Sep 30, 2026| |**OnePay**|[Device Registry Operations](https://www.fastprep.io/problems/onepay-device-registry-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/onepay-device-registry-operations)|๐Ÿ†• Sep 29, 2026| |**Moveworks / Atlassian**|[Design Cloud Usage Billing Infrastructure](https://www.fastprep.io/system-design/cloud-usage-billing-infrastructure)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cloud-usage-billing-infrastructure)|๐Ÿ†• Sep 29, 2026| |**Autodesk / Nykaa**|[Design a Rapid Grocery Ordering Platform](https://www.fastprep.io/system-design/rapid-grocery-ordering-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/rapid-grocery-ordering-platform)|๐Ÿ†• Sep 29, 2026| |**OpenAI**|[Leaves Remaining After Wind Gusts](https://www.fastprep.io/problems/openai-wind-shifted-leaf-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-wind-shifted-leaf-sum)|๐Ÿ†• Sep 29, 2026| |**OpenAI**|[Invert or Blur an Image](https://www.fastprep.io/problems/openai-invert-or-blur-image)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-invert-or-blur-image)|๐Ÿ†• Sep 29, 2026| |**OpenAI**|[Optimal First-Player Card Score](https://www.fastprep.io/problems/openai-optimal-first-player-card-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-optimal-first-player-card-score)|๐Ÿ†• Sep 29, 2026| |**Waymo**|[Design Fleet Map Data Collection](https://www.fastprep.io/system-design/fleet-map-data-collection)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fleet-map-data-collection)|๐Ÿ†• Sep 29, 2026| |**Capital One**|[Design a Credit Card Account and Authorization Platform](https://www.fastprep.io/system-design/credit-card-account-authorization-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/credit-card-account-authorization-platform)|๐Ÿ†• Sep 29, 2026| |**Amperity**|[Design a Read-Once Secret Sharing Service](https://www.fastprep.io/system-design/read-once-secret-sharing)|System design|[![Practice][p]](https://www.fastprep.io/system-design/read-once-secret-sharing)|๐Ÿ†• Sep 29, 2026| |**The D.E. Shaw Group / Uber**|[Design and Implement a Parking Lot](https://www.fastprep.io/low-level-design/uber-parking-lot-design-and-code)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/uber-parking-lot-design-and-code)|๐Ÿ†• Sep 29, 2026| |**Uber Freight**|[Design an In-Memory File System](https://www.fastprep.io/low-level-design/in-memory-file-system)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-file-system)|๐Ÿ†• Sep 29, 2026| |**Mercor**|[Design a Dataset Copy API](https://www.fastprep.io/system-design/dataset-copy-api)|System design|[![Practice][p]](https://www.fastprep.io/system-design/dataset-copy-api)|๐Ÿ†• Sep 29, 2026| |**Microsoft**|[Design a Lab Machine Fleet Monitor](https://www.fastprep.io/system-design/lab-machine-fleet-monitoring)|System design|[![Practice][p]](https://www.fastprep.io/system-design/lab-machine-fleet-monitoring)|๐Ÿ†• Sep 29, 2026| |**Amperity**|[Design an Online SQL Service Over a Data Lake](https://www.fastprep.io/system-design/online-sql-service-over-data-lake)|System design|[![Practice][p]](https://www.fastprep.io/system-design/online-sql-service-over-data-lake)|๐Ÿ†• Sep 29, 2026| |**OpenAI / Sprinter Health**|[Digital Game Distribution Platform](https://www.fastprep.io/system-design/digital-game-distribution-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/digital-game-distribution-platform)|๐Ÿ†• Sep 29, 2026| |**Lyft**|[Stateful Paginated Fetch N](https://www.fastprep.io/problems/lyft-stateful-paginated-fetch-n)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lyft-stateful-paginated-fetch-n)|๐Ÿ†• Sep 29, 2026| |**Google**|[Earliest Full Connectivity with Edge Removals](https://www.fastprep.io/problems/google-first-full-connectivity-with-removals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-first-full-connectivity-with-removals)|๐Ÿ†• Sep 29, 2026| |**DoorDash**|[Customer Bootstrap API](https://www.fastprep.io/problems/doordash-customer-bootstrap-api)|Coding|[![Practice][p]](https://www.fastprep.io/problems/doordash-customer-bootstrap-api)|๐Ÿ†• Sep 29, 2026| |**Amazon**|[Largest Binary-String Subset Within Bit Budgets](https://www.fastprep.io/problems/amazon-binary-strings-bounded-subset)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-binary-strings-bounded-subset)|๐Ÿ†• Sep 29, 2026| |**Capital One**|[Banking System with Top Activity](https://www.fastprep.io/problems/capital-one-banking-top-activity)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-banking-top-activity)|๐Ÿ†• Sep 29, 2026| |**Uber Freight**|[Maximize Compatible Car Riders](https://www.fastprep.io/problems/uber-freight-maximize-compatible-car-riders)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-freight-maximize-compatible-car-riders)|๐Ÿ†• Sep 29, 2026| |**Lyft**|[Nested Transaction Key-Value Store with Value Counts](https://www.fastprep.io/problems/lyft-nested-transaction-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lyft-nested-transaction-key-value-store)|๐Ÿ†• Sep 29, 2026| |**Affirm**|[High-Card Pot Game](https://www.fastprep.io/problems/affirm-high-card-pot-game)|Coding|[![Practice][p]](https://www.fastprep.io/problems/affirm-high-card-pot-game)|๐Ÿ†• Sep 29, 2026| |**Amazon**|[Lowest Common Ancestor in an Inserted BST](https://www.fastprep.io/problems/amazon-bst-lowest-common-ancestor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-bst-lowest-common-ancestor)|๐Ÿ†• Sep 29, 2026| |**DatologyAI**|[Multiline Text Editor with Cursor Movement](https://www.fastprep.io/problems/datologyai-multiline-cursor-text-editor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/datologyai-multiline-cursor-text-editor)|๐Ÿ†• Sep 29, 2026| |**DatologyAI**|[SimpleRDD Multiset Intersection](https://www.fastprep.io/problems/datologyai-simple-rdd-multiset-intersection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/datologyai-simple-rdd-multiset-intersection)|๐Ÿ†• Sep 29, 2026| |**DatologyAI**|[SimpleRDD Word Count](https://www.fastprep.io/problems/datologyai-simple-rdd-word-count)|Coding|[![Practice][p]](https://www.fastprep.io/problems/datologyai-simple-rdd-word-count)|๐Ÿ†• Sep 29, 2026| |**Google**|[Choose a Shortest Path That Avoids Bob](https://www.fastprep.io/problems/google-alice-shortest-path-avoiding-bob)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-alice-shortest-path-avoiding-bob)|๐Ÿ†• Sep 29, 2026| |**Google**|[Count Matrix Paths Through Ordered Checkpoints](https://www.fastprep.io/problems/google-count-checkpoint-paths)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-checkpoint-paths)|๐Ÿ†• Sep 29, 2026| |**Google**|[Maximum-Area Rectangle from Points](https://www.fastprep.io/problems/google-maximum-area-rotated-rectangle)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-maximum-area-rotated-rectangle)|๐Ÿ†• Sep 29, 2026| |**Google**|[Safest Mouse Path Away from a Cat](https://www.fastprep.io/problems/google-mouse-path-maximum-cat-distance)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-mouse-path-maximum-cat-distance)|๐Ÿ†• Sep 29, 2026| |**Google**|[Shortest Land Path](https://www.fastprep.io/problems/google-shortest-land-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-land-path)|๐Ÿ†• Sep 29, 2026| |**Google**|[Unique Elements in Range Queries](https://www.fastprep.io/problems/google-unique-range-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-unique-range-queries)|๐Ÿ†• Sep 29, 2026| |**Google**|[Maximum Profit from Non-Overlapping Jobs](https://www.fastprep.io/problems/google-weighted-interval-job-profit)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-weighted-interval-job-profit)|๐Ÿ†• Sep 29, 2026| |**IBM**|[Variadic Function Library Matches](https://www.fastprep.io/problems/ibm-variadic-function-library-matches)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-variadic-function-library-matches)|๐Ÿ†• Sep 29, 2026| |**Mercor**|[CSV Row Serializer](https://www.fastprep.io/problems/mercor-csv-row-serializer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-csv-row-serializer)|๐Ÿ†• Sep 29, 2026| |**Mercor**|[Merge Sort Report with a Noisy Comparator](https://www.fastprep.io/problems/mercor-noisy-comparator-merge-sort-report)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-noisy-comparator-merge-sort-report)|๐Ÿ†• Sep 29, 2026| |**Microsoft**|[Foreground Region Sizes](https://www.fastprep.io/problems/microsoft-foreground-region-sizes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-foreground-region-sizes)|๐Ÿ†• Sep 29, 2026| |**Netflix**|[Score-Rotating Movie Playlist](https://www.fastprep.io/problems/netflix-score-rotating-movie-playlist)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-score-rotating-movie-playlist)|๐Ÿ†• Sep 29, 2026| |**Netflix**|[Repeated Titles in Viewing History](https://www.fastprep.io/problems/netflix-viewing-history-repeat-buckets)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-viewing-history-repeat-buckets)|๐Ÿ†• Sep 29, 2026| |**Okta**|[Randomized Collection with Duplicate Values](https://www.fastprep.io/problems/okta-randomized-collection-operation-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/okta-randomized-collection-operation-sequence)|๐Ÿ†• Sep 29, 2026| |**Okta**|[Top-Down Employee Reporting Forest](https://www.fastprep.io/problems/okta-top-down-reporting-forest)|Coding|[![Practice][p]](https://www.fastprep.io/problems/okta-top-down-reporting-forest)|๐Ÿ†• Sep 29, 2026| |**Snowflake**|[Length-Prefixed String Codec](https://www.fastprep.io/problems/snowflake-length-prefixed-string-codec)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-length-prefixed-string-codec)|๐Ÿ†• Sep 29, 2026| |**Stripe**|[Render a Task Tree from CSV Rows](https://www.fastprep.io/problems/stripe-csv-task-tree-renderer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-csv-task-tree-renderer)|๐Ÿ†• Sep 29, 2026| |**Uber**|[Dynamic Island Counts](https://www.fastprep.io/problems/uber-dynamic-island-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-dynamic-island-counts)|๐Ÿ†• Sep 29, 2026| |**Uber**|[K Smallest Squares from a Sorted Array](https://www.fastprep.io/problems/uber-k-smallest-squares-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-k-smallest-squares-sorted-array)|๐Ÿ†• Sep 29, 2026| |**Uber**|[Count Connected Islands](https://www.fastprep.io/problems/uber-number-of-islands)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-number-of-islands)|๐Ÿ†• Sep 29, 2026| |**Verkada**|[Host Log Parser](https://www.fastprep.io/problems/verkada-host-log-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/verkada-host-log-parser)|๐Ÿ†• Sep 29, 2026| |**Waymo**|[Island Area and Water Boundary](https://www.fastprep.io/problems/waymo-island-area-water-boundary)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-island-area-water-boundary)|๐Ÿ†• Sep 29, 2026| |**Waymo**|[Linked Perception History](https://www.fastprep.io/problems/waymo-linked-perception-history)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-linked-perception-history)|๐Ÿ†• Sep 29, 2026| |**WhatNot**|[Attraction Route Without Reusing Trails](https://www.fastprep.io/problems/whatnot-attraction-trail-route)|Coding|[![Practice][p]](https://www.fastprep.io/problems/whatnot-attraction-trail-route)|๐Ÿ†• Sep 29, 2026| |**WhatNot**|[Earliest Car for Each Passenger](https://www.fastprep.io/problems/whatnot-earliest-car-passenger-assignments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/whatnot-earliest-car-passenger-assignments)|๐Ÿ†• Sep 29, 2026| |**WhatNot**|[Minimum Stores for a Shopping List](https://www.fastprep.io/problems/whatnot-minimum-stores-for-shopping-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/whatnot-minimum-stores-for-shopping-list)|๐Ÿ†• Sep 29, 2026| |**Google**|[High-Traffic IPs in a Sliding Window](https://www.fastprep.io/problems/google-high-traffic-ips-in-sliding-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-high-traffic-ips-in-sliding-window)|๐Ÿ†• Sep 29, 2026| |**Google**|[Shortest Hop Path Between Machines](https://www.fastprep.io/problems/google-shortest-machine-hop-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-machine-hop-path)|๐Ÿ†• Sep 29, 2026| |**Google**|[Match File Paths with Wildcards](https://www.fastprep.io/problems/google-file-path-wildcard-matching)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-file-path-wildcard-matching)|๐Ÿ†• Sep 29, 2026| |**Google**|[Shortest Grid Path with Obstacle Elimination](https://www.fastprep.io/problems/google-shortest-grid-path-obstacle-elimination)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-grid-path-obstacle-elimination)|๐Ÿ†• Sep 29, 2026| |**Wayfair / PhonePe**|[Design an Audio Fingerprint Recognition Service](https://www.fastprep.io/system-design/audio-fingerprint-recognition-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/audio-fingerprint-recognition-service)|๐Ÿ†• Sep 29, 2026| |**Bloomberg LP / PhonePe**|[Design a To-do List with External Completion Status](https://www.fastprep.io/low-level-design/to-do-list-with-completion-checker)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/to-do-list-with-completion-checker)|๐Ÿ†• Sep 29, 2026| |**Harvey / Nike, Inc. / GEP / Microsoft**|[Grounded Document-Vault Question Answering](https://www.fastprep.io/system-design/grounded-document-vault-question-answering)|System design|[![Practice][p]](https://www.fastprep.io/system-design/grounded-document-vault-question-answering)|๐Ÿ†• Sep 29, 2026| |**Stripe / London Stock Exchange / Atlassian / Wayfair**|[Design an Idempotent Ledger Service](https://www.fastprep.io/system-design/idempotent-ledger-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/idempotent-ledger-service)|๐Ÿ†• Sep 29, 2026| |**Tesla / Nykaa**|[Design an E-commerce Order Fulfillment System](https://www.fastprep.io/system-design/amazon-order-fulfillment-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/amazon-order-fulfillment-system)|๐Ÿ†• Sep 29, 2026| |**PhonePe**|[Design and Implement a To-Do Workflow Application](https://www.fastprep.io/low-level-design/to-do-workflow-application)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/to-do-workflow-application)|๐Ÿ†• Sep 29, 2026| |**Nykaa**|[Course Schedule](https://www.fastprep.io/problems/nykaa-course-schedule)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nykaa-course-schedule)|๐Ÿ†• Sep 29, 2026| |**Nykaa**|[Max Consecutive Ones III](https://www.fastprep.io/problems/nykaa-max-consecutive-ones-iii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nykaa-max-consecutive-ones-iii)|๐Ÿ†• Sep 29, 2026| |**Visa**|[Find the Intersection Node of Two Linked Lists](https://www.fastprep.io/problems/visa-linked-list-intersection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-linked-list-intersection)|๐Ÿ†• Sep 29, 2026| |**Visa**|[Sort Colors](https://www.fastprep.io/problems/visa-sort-colors)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-sort-colors)|๐Ÿ†• Sep 29, 2026| |**Stripe**|[Repair Redirected Request Body Replay](https://www.fastprep.io/project-coding/stripe-redirect-stream-replay)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/stripe-redirect-stream-replay)|๐Ÿ†• Sep 29, 2026| |**Google**|[Count Hotspot Playback Windows](https://www.fastprep.io/problems/google-count-hotspot-playback-windows)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-hotspot-playback-windows)|๐Ÿ†• Sep 29, 2026| |**Google**|[Newly Painted Length Per Day](https://www.fastprep.io/problems/google-newly-painted-length-per-day)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-newly-painted-length-per-day)|๐Ÿ†• Sep 29, 2026| |**Stripe**|[Evaluate Ordered Action Rules](https://www.fastprep.io/problems/stripe-ordered-action-rules)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-ordered-action-rules)|๐Ÿ†• Sep 29, 2026| |**Microsoft**|[Shopkeeper Final Price Summary](https://www.fastprep.io/problems/microsoft-shopkeeper-final-price-summary)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-shopkeeper-final-price-summary)|๐Ÿ†• Sep 28, 2026| |**Microsoft**|[Maximum Reward Points](https://www.fastprep.io/problems/microsoft-get-maximum-reward-points)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-get-maximum-reward-points)|๐Ÿ†• Sep 28, 2026| |**OpenAI**|[Largest Square of Ones](https://www.fastprep.io/problems/openai-largest-square-of-ones)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-largest-square-of-ones)|๐Ÿ†• Sep 28, 2026| |**OpenAI**|[Repair One Movement Instruction](https://www.fastprep.io/problems/openai-repair-one-movement-instruction)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-repair-one-movement-instruction)|๐Ÿ†• Sep 28, 2026| |**Attentive**|[Design Retailer Product Catalog Serving](https://www.fastprep.io/system-design/retailer-product-catalog-serving)|System design|[![Practice][p]](https://www.fastprep.io/system-design/retailer-product-catalog-serving)|๐Ÿ†• Sep 28, 2026| |**DigitalOcean / Attentive**|[Ad Serving and Performance Statistics](https://www.fastprep.io/system-design/ad-serving-performance-statistics)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ad-serving-performance-statistics)|๐Ÿ†• Sep 28, 2026| |**Amazon / Tesla / Datadog / Oracle**|[Design a Video Storage and Streaming Platform](https://www.fastprep.io/system-design/video-storage-streaming-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/video-storage-streaming-platform)|๐Ÿ†• Sep 28, 2026| |**Oracle**|[Next Permutation](https://www.fastprep.io/problems/oracle-next-permutation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-next-permutation)|๐Ÿ†• Sep 28, 2026| |**Abridge**|[Decode String](https://www.fastprep.io/problems/abridge-decode-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/abridge-decode-string)|๐Ÿ†• Sep 28, 2026| |**Abridge**|[Flip, Invert, and Smooth a Binary Image](https://www.fastprep.io/problems/abridge-flip-invert-and-smooth-image)|Coding|[![Practice][p]](https://www.fastprep.io/problems/abridge-flip-invert-and-smooth-image)|๐Ÿ†• Sep 28, 2026| |**Abridge**|[String Compression](https://www.fastprep.io/problems/abridge-string-compression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/abridge-string-compression)|๐Ÿ†• Sep 28, 2026| |**Abridge**|[Sum Multiples of 3, 5, or 7](https://www.fastprep.io/problems/abridge-sum-multiples-of-three-five-seven)|Coding|[![Practice][p]](https://www.fastprep.io/problems/abridge-sum-multiples-of-three-five-seven)|๐Ÿ†• Sep 28, 2026| |**Amazon**|[Evaluate Division](https://www.fastprep.io/problems/amazon-evaluate-division)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-evaluate-division)|๐Ÿ†• Sep 28, 2026| |**Amazon**|[Apply a Reversi Move](https://www.fastprep.io/problems/amazon-reversi-move-simulation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-reversi-move-simulation)|๐Ÿ†• Sep 28, 2026| |**Amazon**|[Longest Content Window with Bounded Labels](https://www.fastprep.io/problems/amazon-streaming-content-label-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-streaming-content-label-window)|๐Ÿ†• Sep 28, 2026| |**ByteDance**|[Spiral Matrix Traversal](https://www.fastprep.io/problems/bytedance-spiral-matrix-traversal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-spiral-matrix-traversal)|๐Ÿ†• Sep 28, 2026| |**Coinbase**|[Select a Fee-Maximizing Dependency-Closed Block](https://www.fastprep.io/problems/coinbase-dependency-aware-block-selection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/coinbase-dependency-aware-block-selection)|๐Ÿ†• Sep 28, 2026| |**Confluent**|[Word Search Across Documents](https://www.fastprep.io/problems/confluent-word-search-across-documents)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-word-search-across-documents)|๐Ÿ†• Sep 28, 2026| |**IBM**|[Count Triplets Within a Value Range](https://www.fastprep.io/problems/ibm-bounded-range-triplet-count)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-bounded-range-triplet-count)|๐Ÿ†• Sep 28, 2026| |**IBM**|[Count Active Employee Access Grants](https://www.fastprep.io/problems/ibm-employee-access-expiration)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-employee-access-expiration)|๐Ÿ†• Sep 28, 2026| |**Uber**|[Grid Robot Route with Charging Priorities](https://www.fastprep.io/problems/uber-grid-robot-charging-priorities)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-grid-robot-charging-priorities)|๐Ÿ†• Sep 28, 2026| |**Wex**|[String Permutations in Custom Character Order](https://www.fastprep.io/problems/wex-custom-ordered-string-permutations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wex-custom-ordered-string-permutations)|๐Ÿ†• Sep 28, 2026| |**Wex**|[Stack Command Output](https://www.fastprep.io/problems/wex-stack-command-output)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wex-stack-command-output)|๐Ÿ†• Sep 28, 2026| |**Capital One**|[Match Songs with Repeatable Animations](https://www.fastprep.io/problems/capital-one-match-songs-with-repeatable-animations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-match-songs-with-repeatable-animations)|๐Ÿ†• Sep 28, 2026| |**Capital One**|[Maximum Rhombic Area Sum](https://www.fastprep.io/problems/capital-one-maximum-rhombic-area-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-maximum-rhombic-area-sum)|๐Ÿ†• Sep 28, 2026| |**Capital One**|[Count Subarrays with K Disjoint Equal Pairs](https://www.fastprep.io/problems/capital-one-count-subarrays-with-k-disjoint-equal-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-count-subarrays-with-k-disjoint-equal-pairs)|๐Ÿ†• Sep 28, 2026| |**Chubb**|[Flat JSON Value Differences](https://www.fastprep.io/problems/chubb-flat-json-value-differences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-flat-json-value-differences)|๐Ÿ†• Sep 28, 2026| |**Chubb**|[Maximum Student-Teacher Distance](https://www.fastprep.io/problems/chubb-maximum-student-teacher-distance)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-maximum-student-teacher-distance)|๐Ÿ†• Sep 28, 2026| |**Chubb**|[Minimum Last-Element Relocations](https://www.fastprep.io/problems/chubb-minimum-last-element-relocations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-minimum-last-element-relocations)|๐Ÿ†• Sep 28, 2026| |**Chubb**|[Minimum Cost to Reach a Target Weight](https://www.fastprep.io/problems/chubb-minimum-power-of-two-weight-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-minimum-power-of-two-weight-cost)|๐Ÿ†• Sep 28, 2026| |**Chubb**|[Most Visited Sprint Marker](https://www.fastprep.io/problems/chubb-most-visited-sprint-marker)|Coding|[![Practice][p]](https://www.fastprep.io/problems/chubb-most-visited-sprint-marker)|๐Ÿ†• Sep 28, 2026| |**Confluent**|[Combination Sum with Unlimited Reuse](https://www.fastprep.io/problems/confluent-combination-sum-with-reuse)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-combination-sum-with-reuse)|๐Ÿ†• Sep 28, 2026| |**Confluent**|[Build an Inverted Document Index](https://www.fastprep.io/problems/confluent-inverted-document-index)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-inverted-document-index)|๐Ÿ†• Sep 28, 2026| |**Confluent**|[Time Map with Sum and Average](https://www.fastprep.io/problems/confluent-time-map-with-aggregates)|Coding|[![Practice][p]](https://www.fastprep.io/problems/confluent-time-map-with-aggregates)|๐Ÿ†• Sep 28, 2026| |**Kotak Mahindra Bank**|[Remove Duplicates From Sorted Array In Place](https://www.fastprep.io/problems/kotak-remove-duplicates-from-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-remove-duplicates-from-sorted-array)|๐Ÿ†• Sep 28, 2026| |**Lloyds Banking Group**|[Distinct Duplicate Values](https://www.fastprep.io/problems/lloyds-banking-group-distinct-duplicate-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lloyds-banking-group-distinct-duplicate-values)|๐Ÿ†• Sep 28, 2026| |**ZoomInfo**|[Decimal Digits in Order](https://www.fastprep.io/problems/zoominfo-decimal-digits-in-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/zoominfo-decimal-digits-in-order)|๐Ÿ†• Sep 28, 2026| |**ZoomInfo**|[Search in Rotated Sorted Array](https://www.fastprep.io/problems/zoominfo-search-in-rotated-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/zoominfo-search-in-rotated-sorted-array)|๐Ÿ†• Sep 28, 2026| |**Amazon**|[Repair Blog Post Creation](https://www.fastprep.io/project-coding/amazon-django-blog-post-creation)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/amazon-django-blog-post-creation)|๐Ÿ†• Sep 28, 2026| |**Attentive**|[Lisp Expression Parser](https://www.fastprep.io/problems/attentive-lisp-expression-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/attentive-lisp-expression-parser)|๐Ÿ†• Sep 27, 2026| |**Attentive**|[Messages in an Inclusive Timestamp Range](https://www.fastprep.io/problems/attentive-log-range-query)|Coding|[![Practice][p]](https://www.fastprep.io/problems/attentive-log-range-query)|๐Ÿ†• Sep 27, 2026| |**Bloomberg LP**|[Lowest Common Ancestor in an N-ary Tree](https://www.fastprep.io/problems/bloomberg-nary-tree-lowest-common-ancestor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bloomberg-nary-tree-lowest-common-ancestor)|๐Ÿ†• Sep 27, 2026| |**Verkada**|[Find the Unique User with Access to Every Camera](https://www.fastprep.io/problems/verkada-admin-user-with-all-camera-access)|Coding|[![Practice][p]](https://www.fastprep.io/problems/verkada-admin-user-with-all-camera-access)|๐Ÿ†• Sep 27, 2026| |**Aurora Innovation**|[Safe LLM Driving Intent Platform](https://www.fastprep.io/system-design/llm-assisted-driving-intent-safety-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/llm-assisted-driving-intent-safety-platform)|๐Ÿ†• Sep 27, 2026| |**Snowflake / Dropbox / Temporal / Attentive / Navan**|[Design a Fault-Tolerant Cloud Queue Service](https://www.fastprep.io/system-design/fault-tolerant-cloud-queue-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fault-tolerant-cloud-queue-service)|๐Ÿ†• Sep 27, 2026| |**Optiver**|[Count Straight-Line Word Occurrences in a Grid](https://www.fastprep.io/problems/optiver-straight-line-word-count)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optiver-straight-line-word-count)|๐Ÿ†• Sep 27, 2026| |**Optiver**|[Fastest Average Speed over a Rolling Kilometer](https://www.fastprep.io/problems/optiver-fastest-rolling-kilometer-speed)|Coding|[![Practice][p]](https://www.fastprep.io/problems/optiver-fastest-rolling-kilometer-speed)|๐Ÿ†• Sep 27, 2026| |**Google**|[Alternating Direction Jump Game](https://www.fastprep.io/problems/google-alternating-direction-jump-game)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-alternating-direction-jump-game)|๐Ÿ†• Sep 27, 2026| |**OpenAI**|[Prefix Matrix Products and Autograd](https://www.fastprep.io/problems/openai-prefix-matrix-products-autograd)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-prefix-matrix-products-autograd)|๐Ÿ†• Sep 27, 2026| |**Bloomberg LP**|[Minimum Replacements to Make Two Strings Anagrams](https://www.fastprep.io/problems/bloomberg-minimum-anagram-replacements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bloomberg-minimum-anagram-replacements)|๐Ÿ†• Sep 27, 2026| |**OpenAI**|[Modal Lock and Fair Modal Lock](https://www.fastprep.io/problems/openai-modal-and-fair-modal-locks)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-modal-and-fair-modal-locks)|๐Ÿ†• Sep 27, 2026| |**Google**|[Build a Combined People Schedule](https://www.fastprep.io/problems/google-people-schedule-segments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-people-schedule-segments)|๐Ÿ†• Sep 27, 2026| |**OpenAI / Figma / Cresta / Tekion**|[Design an Agent Evaluation Platform](https://www.fastprep.io/system-design/agent-evaluation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/agent-evaluation-platform)|๐Ÿ†• Sep 27, 2026| |**Uber / Mercor / Tekion**|[Design a Persistent Multi-Thread AI Chat](https://www.fastprep.io/system-design/persistent-multi-thread-ai-chat)|System design|[![Practice][p]](https://www.fastprep.io/system-design/persistent-multi-thread-ai-chat)|๐Ÿ†• Sep 27, 2026| |**Headway / Expedia**|[Vacation Rental Search and Booking](https://www.fastprep.io/system-design/vacation-rental-search-and-booking)|System design|[![Practice][p]](https://www.fastprep.io/system-design/vacation-rental-search-and-booking)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Minimum Time to Spread Through a Grid](https://www.fastprep.io/problems/amazon-rotting-oranges-variation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-rotting-oranges-variation)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Currency Conversion Rate](https://www.fastprep.io/problems/amazon-currency-conversion-rate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-currency-conversion-rate)|๐Ÿ†• Sep 27, 2026| |**Addepar**|[Flat Records to a Hierarchical Tree](https://www.fastprep.io/problems/addepar-flat-records-to-hierarchical-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/addepar-flat-records-to-hierarchical-tree)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Maximum Stock Profit with At Most Two Transactions](https://www.fastprep.io/problems/amazon-best-time-to-buy-and-sell-stock-iii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-best-time-to-buy-and-sell-stock-iii)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[House Robber](https://www.fastprep.io/problems/amazon-house-robber)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-house-robber)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Lisp Expression Parser](https://www.fastprep.io/problems/amazon-lisp-expression-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-lisp-expression-parser)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Maximize Consecutive Equal Answers](https://www.fastprep.io/problems/amazon-maximize-answer-key-confusion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximize-answer-key-confusion)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Most Frequent Name](https://www.fastprep.io/problems/amazon-most-frequent-name)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-most-frequent-name)|๐Ÿ†• Sep 27, 2026| |**Arista Networks**|[API Bandwidth Allocation](https://www.fastprep.io/problems/arista-networks-api-bandwidth-allocation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/arista-networks-api-bandwidth-allocation)|๐Ÿ†• Sep 27, 2026| |**Arista Networks**|[LFU Cache](https://www.fastprep.io/problems/arista-networks-lfu-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/arista-networks-lfu-cache)|๐Ÿ†• Sep 27, 2026| |**Expedia**|[Scramble String](https://www.fastprep.io/problems/expedia-scramble-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/expedia-scramble-string)|๐Ÿ†• Sep 27, 2026| |**Expedia**|[Smallest Sufficient Team](https://www.fastprep.io/problems/expedia-smallest-sufficient-team)|Coding|[![Practice][p]](https://www.fastprep.io/problems/expedia-smallest-sufficient-team)|๐Ÿ†• Sep 27, 2026| |**Google**|[Balance a Two-Letter String with at Most Two Cuts](https://www.fastprep.io/problems/google-balance-two-letter-string-with-cuts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-balance-two-letter-string-with-cuts)|๐Ÿ†• Sep 27, 2026| |**Google**|[Find a Good-Subarray Endpoint Pair](https://www.fastprep.io/problems/google-good-subarray-index-pair)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-good-subarray-index-pair)|๐Ÿ†• Sep 27, 2026| |**Tekion**|[Peak Resource Usage Across Weighted Intervals](https://www.fastprep.io/problems/tekion-weighted-interval-peak-resource-usage)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tekion-weighted-interval-peak-resource-usage)|๐Ÿ†• Sep 27, 2026| |**Meta**|[Deterministic K-Means Assignments](https://www.fastprep.io/problems/meta-deterministic-k-means-assignments)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-deterministic-k-means-assignments)|๐Ÿ†• Sep 27, 2026| |**LinkedIn**|[Merge N-Ary Trees by Key](https://www.fastprep.io/problems/linkedin-merge-n-ary-trees-by-key)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-merge-n-ary-trees-by-key)|๐Ÿ†• Sep 27, 2026| |**Google**|[Course Schedule II](https://www.fastprep.io/problems/google-course-schedule-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-course-schedule-ii)|๐Ÿ†• Sep 27, 2026| |**Meta**|[Linear Layer Forward and Backward Passes](https://www.fastprep.io/problems/meta-linear-layer-forward-backward)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-linear-layer-forward-backward)|๐Ÿ†• Sep 27, 2026| |**Meta**|[Reservoir Sampling with Recorded Draws](https://www.fastprep.io/problems/meta-reservoir-sampling-with-recorded-draws)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-reservoir-sampling-with-recorded-draws)|๐Ÿ†• Sep 27, 2026| |**Meta**|[Stochastic Gradient Descent with Momentum](https://www.fastprep.io/problems/meta-sgd-with-momentum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-sgd-with-momentum)|๐Ÿ†• Sep 27, 2026| |**Meta**|[Top K Largest Values with a Heap](https://www.fastprep.io/problems/meta-top-k-largest-with-heap)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-top-k-largest-with-heap)|๐Ÿ†• Sep 27, 2026| |**Tekion**|[Design a Durable Agent Workflow Runtime](https://www.fastprep.io/system-design/durable-agent-workflow-runtime)|System design|[![Practice][p]](https://www.fastprep.io/system-design/durable-agent-workflow-runtime)|๐Ÿ†• Sep 27, 2026| |**Amazon**|[Design an Extensible Financial Account with Charges and Tax](https://www.fastprep.io/low-level-design/extensible-financial-account-charges)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/extensible-financial-account-charges)|๐Ÿ†• Sep 27, 2026| |**Expedia**|[Design Collaborative Versioned File Storage](https://www.fastprep.io/low-level-design/collaborative-versioned-file-storage-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/collaborative-versioned-file-storage-domain)|๐Ÿ†• Sep 27, 2026| |**Google**|[Count One-Valued Regions in a Binary Tree](https://www.fastprep.io/problems/google-count-one-regions-in-binary-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-one-regions-in-binary-tree)|๐Ÿ†• Sep 26, 2026| |**Airwallex**|[4Sum Index Quadruples](https://www.fastprep.io/problems/airwallex-four-sum-index-quadruples)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airwallex-four-sum-index-quadruples)|๐Ÿ†• Sep 26, 2026| |**IBM**|[Maximum Points by Deleting Elements](https://www.fastprep.io/problems/ibm-maximum-points-by-deleting-elements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-maximum-points-by-deleting-elements)|๐Ÿ†• Sep 26, 2026| |**Suno**|[Longest Path in a Directed Acyclic Graph](https://www.fastprep.io/problems/suno-longest-dag-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/suno-longest-dag-path)|๐Ÿ†• Sep 26, 2026| |**Suno**|[Referral Credits After a First Song](https://www.fastprep.io/problems/suno-referral-song-credits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/suno-referral-song-credits)|๐Ÿ†• Sep 26, 2026| |**Wayve**|[Factorial Without Multiplication](https://www.fastprep.io/problems/wayve-factorial-without-multiplication)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wayve-factorial-without-multiplication)|๐Ÿ†• Sep 26, 2026| |**Wayve**|[Non-Maximum Suppression](https://www.fastprep.io/problems/wayve-non-maximum-suppression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wayve-non-maximum-suppression)|๐Ÿ†• Sep 26, 2026| |**Wayve**|[Longest Stationary Sensor Interval](https://www.fastprep.io/problems/wayve-longest-stationary-interval)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wayve-longest-stationary-interval)|๐Ÿ†• Sep 26, 2026| |**Waabi**|[Root Mean Square Error](https://www.fastprep.io/problems/waabi-root-mean-square-error)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waabi-root-mean-square-error)|๐Ÿ†• Sep 26, 2026| |**Rogo**|[Password From Ordering Hints](https://www.fastprep.io/problems/rogo-password-from-ordering-hints)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rogo-password-from-ordering-hints)|๐Ÿ†• Sep 26, 2026| |**Etched**|[Periodic Event Loop](https://www.fastprep.io/problems/etched-periodic-event-loop)|Coding|[![Practice][p]](https://www.fastprep.io/problems/etched-periodic-event-loop)|๐Ÿ†• Sep 26, 2026| |**Etched**|[DMA Stream Distribution](https://www.fastprep.io/problems/etched-dma-stream-distribution)|Coding|[![Practice][p]](https://www.fastprep.io/problems/etched-dma-stream-distribution)|๐Ÿ†• Sep 26, 2026| |**Modal**|[Single-Flight Chunk Cache](https://www.fastprep.io/problems/modal-single-flight-chunk-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/modal-single-flight-chunk-cache)|๐Ÿ†• Sep 26, 2026| |**Waabi**|[Autonomous Driving Auto-Labeling Pipeline](https://www.fastprep.io/system-design/autonomous-driving-auto-labeling-pipeline)|System design|[![Practice][p]](https://www.fastprep.io/system-design/autonomous-driving-auto-labeling-pipeline)|๐Ÿ†• Sep 26, 2026| |**Wayve / Waabi**|[Autonomous Driving Simulation Platform](https://www.fastprep.io/system-design/autonomous-driving-simulation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/autonomous-driving-simulation-platform)|๐Ÿ†• Sep 26, 2026| |**Modal Learning**|[Burst-Aware Serverless Task Scheduler](https://www.fastprep.io/system-design/burst-task-scheduler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/burst-task-scheduler)|๐Ÿ†• Sep 26, 2026| |**Supabase**|[Database-Per-Project Control Plane](https://www.fastprep.io/system-design/database-per-project-control-plane)|System design|[![Practice][p]](https://www.fastprep.io/system-design/database-per-project-control-plane)|๐Ÿ†• Sep 26, 2026| |**Wayve / Waabi**|[Driving Log Ingestion and Query Platform](https://www.fastprep.io/system-design/driving-log-ingestion-query-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/driving-log-ingestion-query-platform)|๐Ÿ†• Sep 26, 2026| |**Supabase**|[Global Edge Functions Platform](https://www.fastprep.io/system-design/global-edge-functions-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/global-edge-functions-platform)|๐Ÿ†• Sep 26, 2026| |**Lambda**|[High-Throughput ML Object Store](https://www.fastprep.io/system-design/high-throughput-ml-object-store)|System design|[![Practice][p]](https://www.fastprep.io/system-design/high-throughput-ml-object-store)|๐Ÿ†• Sep 26, 2026| |**Lambda**|[Kubernetes GPU Workload Control Plane](https://www.fastprep.io/system-design/kubernetes-gpu-control-plane)|System design|[![Practice][p]](https://www.fastprep.io/system-design/kubernetes-gpu-control-plane)|๐Ÿ†• Sep 26, 2026| |**Modal Learning**|[Large Model Artifact Cache](https://www.fastprep.io/system-design/model-artifact-cache)|System design|[![Practice][p]](https://www.fastprep.io/system-design/model-artifact-cache)|๐Ÿ†• Sep 26, 2026| |**LangChain**|[LLM Observability and Alerting Platform](https://www.fastprep.io/system-design/llm-observability-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/llm-observability-platform)|๐Ÿ†• Sep 26, 2026| |**Lambda**|[Multi-Tenant GPU Cluster Scheduler](https://www.fastprep.io/system-design/multi-tenant-gpu-scheduler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multi-tenant-gpu-scheduler)|๐Ÿ†• Sep 26, 2026| |**Supabase**|[Real-Time Database Change Broadcast](https://www.fastprep.io/system-design/realtime-database-change-broadcast)|System design|[![Practice][p]](https://www.fastprep.io/system-design/realtime-database-change-broadcast)|๐Ÿ†• Sep 26, 2026| |**Modal Learning**|[Warm GPU Container Pool](https://www.fastprep.io/system-design/warm-gpu-container-pool)|System design|[![Practice][p]](https://www.fastprep.io/system-design/warm-gpu-container-pool)|๐Ÿ†• Sep 26, 2026| |**Rippling**|[Server Management](https://www.fastprep.io/problems/rippling-server-management)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-server-management)|๐Ÿ†• Sep 26, 2026| |**Rippling**|[Costliest Chocolate](https://www.fastprep.io/problems/rippling-costliest-chocolate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-costliest-chocolate)|๐Ÿ†• Sep 26, 2026| |**Rippling**|[Consistent Logs](https://www.fastprep.io/problems/rippling-consistent-logs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-consistent-logs)|๐Ÿ†• Sep 26, 2026| |**Infosys / Waymo / Goldman Sachs / Onehouse / Amazon / Meta / Flipkart / Luma AI / Motive**|[Design Ride-Hailing Dispatch and Trip Lifecycle](https://www.fastprep.io/system-design/regional-ride-hailing-dispatch-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/regional-ride-hailing-dispatch-system)|๐Ÿ†• Sep 26, 2026| |**Salesforce / Replit / Sarvam AI / Microsoft / Gojek / Goldman Sachs / Amazon / Blinkit / Reddit / Qualified Health AI / Suno / WhatNot**|[Design an Event-Driven Notification System](https://www.fastprep.io/system-design/event-driven-notification-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/event-driven-notification-system)|๐Ÿ†• Sep 26, 2026| |**LinkedIn / Airbyte / Zomato / Eternal**|[Design an Ads Bidding, Pacing, and Forecast Platform](https://www.fastprep.io/system-design/ads-bidding-pacing-forecast-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ads-bidding-pacing-forecast-platform)|๐Ÿ†• Sep 26, 2026| |**Accenture**|[Nearest Composite Number](https://www.fastprep.io/problems/accenture-nearest-composite-number)|Coding|[![Practice][p]](https://www.fastprep.io/problems/accenture-nearest-composite-number)|๐Ÿ†• Sep 26, 2026| |**Goldman Sachs**|[Dijkstra Shortest Paths in a Weighted Undirected Graph](https://www.fastprep.io/problems/goldman-sachs-dijkstra-shortest-paths)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-dijkstra-shortest-paths)|๐Ÿ†• Sep 26, 2026| |**Goldman Sachs**|[Longest Palindromic Subsequence](https://www.fastprep.io/problems/goldman-sachs-longest-palindromic-subsequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-longest-palindromic-subsequence)|๐Ÿ†• Sep 26, 2026| |**Goldman Sachs**|[Meeting Rooms](https://www.fastprep.io/problems/goldman-sachs-meeting-rooms)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-meeting-rooms)|๐Ÿ†• Sep 26, 2026| |**Goldman Sachs**|[Merge Overlapping Intervals](https://www.fastprep.io/problems/goldman-sachs-merge-overlapping-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-merge-overlapping-intervals)|๐Ÿ†• Sep 26, 2026| |**Goldman Sachs**|[Subset Sum to Target](https://www.fastprep.io/problems/goldman-sachs-subset-sum-target)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-subset-sum-target)|๐Ÿ†• Sep 26, 2026| |**Mygate**|[Maximum Subarray Sum](https://www.fastprep.io/problems/mygate-maximum-subarray-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mygate-maximum-subarray-sum)|๐Ÿ†• Sep 26, 2026| |**Mygate**|[Remove Invalid Parentheses](https://www.fastprep.io/problems/mygate-remove-invalid-parentheses)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mygate-remove-invalid-parentheses)|๐Ÿ†• Sep 26, 2026| |**Mygate**|[Reverse a Linked List](https://www.fastprep.io/problems/mygate-reverse-linked-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mygate-reverse-linked-list)|๐Ÿ†• Sep 26, 2026| |**Mygate**|[Employees Earning More Than Their Manager](https://www.fastprep.io/problems/mygate-employees-over-manager)|SQL|[![Practice][p]](https://www.fastprep.io/problems/mygate-employees-over-manager)|๐Ÿ†• Sep 26, 2026| |**Mygate**|[Users Active in Both January and February](https://www.fastprep.io/problems/mygate-users-active-january-february)|SQL|[![Practice][p]](https://www.fastprep.io/problems/mygate-users-active-january-february)|๐Ÿ†• Sep 26, 2026| |**Hartford Financial Services**|[Maximum Product Subarray](https://www.fastprep.io/problems/hartford-maximum-product-subarray)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hartford-maximum-product-subarray)|๐Ÿ†• Sep 26, 2026| |**TikTok**|[Count Subarrays Matching a Comparison Pattern](https://www.fastprep.io/problems/tiktok-count-subarrays-matching-comparison-pattern)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-subarrays-matching-comparison-pattern)|๐Ÿ†• Sep 25, 2026| |**TikTok**|[Partition Matrix by Nonnegative Averages](https://www.fastprep.io/problems/tiktok-partition-matrix-by-nonnegative-averages)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-partition-matrix-by-nonnegative-averages)|๐Ÿ†• Sep 25, 2026| |**Ramp**|[Convert Snake Case Variables to Camel Case](https://www.fastprep.io/problems/ramp-convert-snake-case-variables-to-camel-case)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ramp-convert-snake-case-variables-to-camel-case)|๐Ÿ†• Sep 25, 2026| |**Character.AI**|[Spreadsheet With Dependent Cells](https://www.fastprep.io/problems/character-ai-dependent-spreadsheet)|Coding|[![Practice][p]](https://www.fastprep.io/problems/character-ai-dependent-spreadsheet)|๐Ÿ†• Sep 25, 2026| |**Clay**|[Hierarchical In-Memory File System](https://www.fastprep.io/problems/clay-hierarchical-file-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/clay-hierarchical-file-system)|๐Ÿ†• Sep 25, 2026| |**Clay**|[Workspace File System With Folders and Tables](https://www.fastprep.io/problems/clay-workspace-folders-and-tables)|Coding|[![Practice][p]](https://www.fastprep.io/problems/clay-workspace-folders-and-tables)|๐Ÿ†• Sep 25, 2026| |**Alpaca**|[Large-Scale Messaging Application](https://www.fastprep.io/system-design/large-scale-messaging-application)|System design|[![Practice][p]](https://www.fastprep.io/system-design/large-scale-messaging-application)|๐Ÿ†• Sep 25, 2026| |**Hudson River Trading**|[Sort Matrix Borders](https://www.fastprep.io/problems/hrt-sort-matrix-borders)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-sort-matrix-borders)|๐Ÿ†• Sep 25, 2026| |**Hudson River Trading**|[Rearrange String by Alternating Ends](https://www.fastprep.io/problems/hrt-rearrange-string-by-alternating-ends)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-rearrange-string-by-alternating-ends)|๐Ÿ†• Sep 25, 2026| |**Hudson River Trading**|[Rectangle Fit Queries](https://www.fastprep.io/problems/hrt-rectangle-fit-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-rectangle-fit-queries)|๐Ÿ†• Sep 25, 2026| |**Hudson River Trading**|[Round-Robin WDL Order](https://www.fastprep.io/problems/hrt-round-robin-wdl-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-round-robin-wdl-order)|๐Ÿ†• Sep 25, 2026| |**Visa**|[Distinct Chapters Missed During a Cyclic Absence](https://www.fastprep.io/problems/visa-distinct-chapters-missed-during-cyclic-absence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-distinct-chapters-missed-during-cyclic-absence)|๐Ÿ†• Sep 25, 2026| |**Visa**|[Minimum Values with Even Powers of Two](https://www.fastprep.io/problems/visa-minimum-values-even-powers-of-two)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-minimum-values-even-powers-of-two)|๐Ÿ†• Sep 25, 2026| |**Visa**|[Maximum Non-Decreasing Array Length](https://www.fastprep.io/problems/visa-maximum-nondecreasing-array-length)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-maximum-nondecreasing-array-length)|๐Ÿ†• Sep 25, 2026| |**TikTok**|[Lowest Number in an Open Range](https://www.fastprep.io/problems/tiktok-lowest-number-in-open-range)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-lowest-number-in-open-range)|๐Ÿ†• Sep 25, 2026| |**TikTok**|[Count One-Swap Number Pairs](https://www.fastprep.io/problems/tiktok-count-one-swap-number-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tiktok-count-one-swap-number-pairs)|๐Ÿ†• Sep 25, 2026| |**Meta / Amazon**|[Design Real-Time Chatbot Training and Evaluation](https://www.fastprep.io/system-design/real-time-chatbot-training-and-evaluation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/real-time-chatbot-training-and-evaluation)|๐Ÿ†• Sep 25, 2026| |**Amazon**|[Group-Relative Policy Advantages](https://www.fastprep.io/problems/amazon-group-relative-policy-advantages)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-group-relative-policy-advantages)|๐Ÿ†• Sep 25, 2026| |**Amazon**|[Grouped-Query Attention with a KV Cache](https://www.fastprep.io/problems/amazon-grouped-query-attention-with-kv-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-grouped-query-attention-with-kv-cache)|๐Ÿ†• Sep 25, 2026| |**Mercor**|[Minimum Friend API Calls](https://www.fastprep.io/problems/mercor-minimum-friend-api-calls)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-minimum-friend-api-calls)|๐Ÿ†• Sep 25, 2026| |**Mercor**|[Park Train Cars by Preference](https://www.fastprep.io/problems/mercor-train-car-parking-preferences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-train-car-parking-preferences)|๐Ÿ†• Sep 25, 2026| |**Strava**|[Climb Detection with Recoverable Dips](https://www.fastprep.io/problems/strava-climb-detection-with-recoverable-dips)|Coding|[![Practice][p]](https://www.fastprep.io/problems/strava-climb-detection-with-recoverable-dips)|๐Ÿ†• Sep 25, 2026| |**UiPath**|[New 21 Game Probability](https://www.fastprep.io/problems/uipath-new-21-game-probability)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uipath-new-21-game-probability)|๐Ÿ†• Sep 25, 2026| |**OpenAI**|[Design In-Store Merchant Payment Reconciliation](https://www.fastprep.io/system-design/offline-merchant-payment-reconciliation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/offline-merchant-payment-reconciliation)|๐Ÿ†• Sep 25, 2026| |**PayPay / Fox Corporation**|[Design a Payment Transaction State Machine](https://www.fastprep.io/low-level-design/payment-transaction-state-machine)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/payment-transaction-state-machine)|๐Ÿ†• Sep 25, 2026| |**Zomato / Eternal / Amazon / Tekion / Motive / Capgemini**|[Design an Online Ordering Platform](https://www.fastprep.io/system-design/online-ordering-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/online-ordering-platform)|๐Ÿ†• Sep 25, 2026| |**Salesforce / The Trade Desk / Morgan Stanley**|[Design an Elevator Control System](https://www.fastprep.io/low-level-design/elevator-dispatch-control-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/elevator-dispatch-control-domain)|๐Ÿ†• Sep 25, 2026| |**Goldman Sachs / Meesho**|[Design a Brokerage Order Processing Domain](https://www.fastprep.io/low-level-design/brokerage-order-processing-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/brokerage-order-processing-domain)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Design a Job Application Portal](https://www.fastprep.io/system-design/job-application-portal)|System design|[![Practice][p]](https://www.fastprep.io/system-design/job-application-portal)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Design a Learning Management Platform](https://www.fastprep.io/system-design/learning-management-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/learning-management-platform)|๐Ÿ†• Sep 25, 2026| |**Bloomberg LP**|[Currency Conversion Rate](https://www.fastprep.io/problems/bloomberg-currency-conversion-rate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bloomberg-currency-conversion-rate)|๐Ÿ†• Sep 25, 2026| |**Agoda**|[Shortest Subarray With the Full Degree](https://www.fastprep.io/problems/agoda-degree-of-an-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/agoda-degree-of-an-array)|๐Ÿ†• Sep 25, 2026| |**Agoda**|[Disk Space Window Analyzer](https://www.fastprep.io/problems/agoda-disk-space-window-analyzer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/agoda-disk-space-window-analyzer)|๐Ÿ†• Sep 25, 2026| |**Bloomberg LP**|[Running Stream Aggregates](https://www.fastprep.io/problems/bloomberg-running-stream-aggregation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bloomberg-running-stream-aggregation)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Contains Duplicate](https://www.fastprep.io/problems/capgemini-contains-duplicate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-contains-duplicate)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Detect a Linked-List Cycle](https://www.fastprep.io/problems/capgemini-linked-list-cycle)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-linked-list-cycle)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Longest Substring Without Repeating Characters](https://www.fastprep.io/problems/capgemini-longest-substring-without-repeating-characters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-longest-substring-without-repeating-characters)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Merge Overlapping Intervals](https://www.fastprep.io/problems/capgemini-merge-overlapping-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-merge-overlapping-intervals)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Merge Two Sorted Arrays](https://www.fastprep.io/problems/capgemini-merge-two-sorted-arrays)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-merge-two-sorted-arrays)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Product of Array Except Self](https://www.fastprep.io/problems/capgemini-product-of-array-except-self)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-product-of-array-except-self)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Search in Rotated Sorted Array](https://www.fastprep.io/problems/capgemini-search-in-rotated-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-search-in-rotated-sorted-array)|๐Ÿ†• Sep 25, 2026| |**Capgemini**|[Top K Frequent Elements](https://www.fastprep.io/problems/capgemini-top-k-frequent-elements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capgemini-top-k-frequent-elements)|๐Ÿ†• Sep 25, 2026| |**Fox Corporation**|[Merge Overlapping Intervals](https://www.fastprep.io/problems/fox-corporation-merge-overlapping-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/fox-corporation-merge-overlapping-intervals)|๐Ÿ†• Sep 25, 2026| |**Fox Corporation**|[S-Shaped Matrix Traversal](https://www.fastprep.io/problems/fox-corporation-s-shaped-matrix-traversal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/fox-corporation-s-shaped-matrix-traversal)|๐Ÿ†• Sep 25, 2026| |**Kaseya**|[Best Stock Profit With a Sell Fee](https://www.fastprep.io/problems/kaseya-stock-profit-with-sell-fee)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kaseya-stock-profit-with-sell-fee)|๐Ÿ†• Sep 25, 2026| |**Moveworks**|[Underline Shortest Unique Substrings](https://www.fastprep.io/problems/moveworks-shortest-unique-substring-highlighting)|Coding|[![Practice][p]](https://www.fastprep.io/problems/moveworks-shortest-unique-substring-highlighting)|๐Ÿ†• Sep 25, 2026| |**Odoo**|[Same Binary Tree](https://www.fastprep.io/problems/odoo-same-binary-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/odoo-same-binary-tree)|๐Ÿ†• Sep 25, 2026| |**Salesforce**|[Construct a Tree from Level-Order and Inorder Traversals](https://www.fastprep.io/problems/salesforce-construct-tree-level-inorder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-construct-tree-level-inorder)|๐Ÿ†• Sep 25, 2026| |**Salesforce**|[Maximize Monsters Defeated](https://www.fastprep.io/problems/salesforce-maximize-monsters-defeated)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-maximize-monsters-defeated)|๐Ÿ†• Sep 25, 2026| |**Zomato / Eternal**|[Friend Circles and Redundant Connections](https://www.fastprep.io/problems/zomato-friend-circles-and-redundant-edges)|Coding|[![Practice][p]](https://www.fastprep.io/problems/zomato-friend-circles-and-redundant-edges)|๐Ÿ†• Sep 25, 2026| |**Groww**|[Design a Good-Till-Trade Order Service](https://www.fastprep.io/system-design/good-till-trade-order-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/good-till-trade-order-service)|๐Ÿ†• Sep 25, 2026| |**Fox Corporation**|[Design Payment-Gateway Outage Alerting](https://www.fastprep.io/system-design/payment-gateway-outage-alerting-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/payment-gateway-outage-alerting-platform)|๐Ÿ†• Sep 25, 2026| |**Eightfold**|[Design Recurring Meeting-Room Booking](https://www.fastprep.io/low-level-design/recurring-meeting-room-booking-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/recurring-meeting-room-booking-domain)|๐Ÿ†• Sep 25, 2026| |**Odoo**|[Build FIFO Inventory Costing](https://www.fastprep.io/project-coding/fifo-inventory-costing-service)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/fifo-inventory-costing-service)|๐Ÿ†• Sep 25, 2026| |**Groww**|[Build an Extensible Brokerage Charge Calculator](https://www.fastprep.io/project-coding/brokerage-charge-calculator)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/brokerage-charge-calculator)|๐Ÿ†• Sep 25, 2026| |**Microsoft**|[Grid Paths with Override Passes](https://www.fastprep.io/problems/microsoft-grid-paths-with-override-passes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-grid-paths-with-override-passes)|๐Ÿ†• Sep 25, 2026| |**Microsoft**|[Weighted LFU Cache](https://www.fastprep.io/problems/microsoft-weighted-lfu-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-weighted-lfu-cache)|๐Ÿ†• Sep 25, 2026| |**Google**|[Count Determinable Player Rankings](https://www.fastprep.io/problems/google-count-determinable-player-rankings)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-count-determinable-player-rankings)|๐Ÿ†• Sep 25, 2026| |**Walmart**|[House Robber](https://www.fastprep.io/problems/walmart-house-robber)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walmart-house-robber)|๐Ÿ†• Sep 24, 2026| |**FalconX**|[Longest Low-Slippage Execution Window](https://www.fastprep.io/problems/falconx-longest-low-slippage-window)|Coding|[![Practice][p]](https://www.fastprep.io/problems/falconx-longest-low-slippage-window)|๐Ÿ†• Sep 24, 2026| |**OpenAI**|[GPU Credit Ledger with a Negative-Balance Failure State](https://www.fastprep.io/problems/openai-gpu-credit-negative-balance-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-gpu-credit-negative-balance-ledger)|๐Ÿ†• Sep 24, 2026| |**Visa**|[Longest Increasing Path in a Matrix](https://www.fastprep.io/problems/visa-longest-increasing-path-in-matrix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-longest-increasing-path-in-matrix)|๐Ÿ†• Sep 24, 2026| |**DoorDash**|[Simulate an Idempotent Refund Service Flow](https://www.fastprep.io/problems/doordash-refund-service-flow)|Coding|[![Practice][p]](https://www.fastprep.io/problems/doordash-refund-service-flow)|๐Ÿ†• Sep 24, 2026| |**Oracle**|[Merge One List Between Two Positions](https://www.fastprep.io/problems/oracle-merge-in-between-linked-lists)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-merge-in-between-linked-lists)|๐Ÿ†• Sep 24, 2026| |**Oracle**|[TTL Cache Operations](https://www.fastprep.io/problems/oracle-ttl-cache-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-ttl-cache-operations)|๐Ÿ†• Sep 24, 2026| |**Reddit**|[Filter Undesired Comments and Their Descendants](https://www.fastprep.io/problems/reddit-undesired-comment-descendants)|Coding|[![Practice][p]](https://www.fastprep.io/problems/reddit-undesired-comment-descendants)|๐Ÿ†• Sep 24, 2026| |**Meta**|[Multi-Head Attention Forward Pass](https://www.fastprep.io/problems/meta-multi-head-attention-forward)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-multi-head-attention-forward)|๐Ÿ†• Sep 24, 2026| |**Oracle**|[Valid Parentheses](https://www.fastprep.io/problems/oracle-valid-parentheses)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-valid-parentheses)|๐Ÿ†• Sep 24, 2026| |**Oracle**|[Valid Parenthesis String](https://www.fastprep.io/problems/oracle-valid-parenthesis-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-valid-parenthesis-string)|๐Ÿ†• Sep 24, 2026| |**Pylon**|[Render SQL with a Query Builder](https://www.fastprep.io/problems/pylon-sql-query-builder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pylon-sql-query-builder)|๐Ÿ†• Sep 24, 2026| |**OpenAI**|[One-Nearest-Neighbor Classification with Manhattan Distance](https://www.fastprep.io/problems/openai-one-nearest-neighbor-manhattan-distance)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-one-nearest-neighbor-manhattan-distance)|๐Ÿ†• Sep 24, 2026| |**Airbnb**|[Task Management System](https://www.fastprep.io/problems/airbnb-task-management-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-task-management-system)|๐Ÿ†• Sep 24, 2026| |**New Relic**|[Basic String Compression with Length Guard](https://www.fastprep.io/problems/new-relic-basic-string-compression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/new-relic-basic-string-compression)|๐Ÿ†• Sep 24, 2026| |**New Relic**|[Longest Increasing Path in a Matrix](https://www.fastprep.io/problems/new-relic-longest-increasing-path-in-matrix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/new-relic-longest-increasing-path-in-matrix)|๐Ÿ†• Sep 24, 2026| |**Visa**|[Top Mutual-Friend Recommendations](https://www.fastprep.io/problems/visa-mutual-friend-recommendations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-mutual-friend-recommendations)|๐Ÿ†• Sep 24, 2026| |**Visa**|[Minimum Power-of-Two Removal Operations](https://www.fastprep.io/problems/visa-minimum-power-of-two-removal-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-minimum-power-of-two-removal-operations)|๐Ÿ†• Sep 24, 2026| |**Visa**|[Optimal Transfer](https://www.fastprep.io/problems/visa-optimal-transfer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-optimal-transfer)|๐Ÿ†• Sep 24, 2026| |**JP Morgan Chase**|[Same Substring Within Budget](https://www.fastprep.io/problems/jpmorgan-same-substring-within-budget)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-same-substring-within-budget)|๐Ÿ†• Sep 24, 2026| |**JP Morgan Chase**|[Minimum Digit Changes Between String Halves](https://www.fastprep.io/problems/jpmorgan-minimum-digit-anagram-changes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-minimum-digit-anagram-changes)|๐Ÿ†• Sep 24, 2026| |**Intuit**|[Amend a Git Commit from Bash](https://www.fastprep.io/project-coding/intuit-amend-git-commit-history)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/intuit-amend-git-commit-history)|๐Ÿ†• Sep 24, 2026| |**Amazon / The Trade Desk / Tekion / Navan**|[Design an In-Memory Publish-Subscribe Library](https://www.fastprep.io/low-level-design/in-memory-publish-subscribe-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-publish-subscribe-library)|๐Ÿ†• Sep 24, 2026| |**New Relic**|[Design Long-Running Trace Event Grouping](https://www.fastprep.io/system-design/distributed-trace-event-grouping)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-trace-event-grouping)|๐Ÿ†• Sep 24, 2026| |**OpenAI**|[Design a Distributed Video Generation Platform](https://www.fastprep.io/system-design/distributed-video-generation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-video-generation-platform)|๐Ÿ†• Sep 24, 2026| |**Tesla**|[Design an Electric-Vehicle Charging Platform](https://www.fastprep.io/system-design/electric-vehicle-charging-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/electric-vehicle-charging-platform)|๐Ÿ†• Sep 24, 2026| |**Reddit**|[Design a Comment-Likelihood Prediction Platform](https://www.fastprep.io/system-design/comment-likelihood-prediction-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/comment-likelihood-prediction-platform)|๐Ÿ†• Sep 24, 2026| |**Harvey**|[Design a Long-Horizon Agent Training Environment Platform](https://www.fastprep.io/system-design/long-horizon-agent-training-environment-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/long-horizon-agent-training-environment-platform)|๐Ÿ†• Sep 24, 2026| |**Tekion / Amazon / Oracle**|[Design a Configurable Logging Framework](https://www.fastprep.io/low-level-design/logging-framework)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/logging-framework)|๐Ÿ†• Sep 24, 2026| |**Airbnb**|[Progressive Banking System](https://www.fastprep.io/problems/airbnb-progressive-banking-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-progressive-banking-system)|๐Ÿ†• Sep 24, 2026| |**OpenAI**|[Sparse Plant Infection Simulation](https://www.fastprep.io/problems/openai-plant-infection-simulation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-plant-infection-simulation)|๐Ÿ†• Sep 24, 2026| |**Capital One**|[Sort Adjacent Pairs](https://www.fastprep.io/problems/capital-one-sort-adjacent-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-sort-adjacent-pairs)|๐Ÿ†• Sep 24, 2026| |**Capital One**|[Count Subarrays Matching a Comparison Pattern](https://www.fastprep.io/problems/capital-one-count-matching-subarrays)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-count-matching-subarrays)|๐Ÿ†• Sep 24, 2026| |**Capital One**|[Brightest Position on a Street](https://www.fastprep.io/problems/capital-one-brightest-position-on-street)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-brightest-position-on-street)|๐Ÿ†• Sep 24, 2026| |**Capital One**|[Alternate String Ends](https://www.fastprep.io/problems/capital-one-alternating-string-ends)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-alternating-string-ends)|๐Ÿ†• Sep 24, 2026| |**SentinelOne / PhonePe**|[Design a Thread-Safe Queryable Logger Library](https://www.fastprep.io/low-level-design/thread-safe-queryable-logger-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/thread-safe-queryable-logger-library)|๐Ÿ†• Sep 24, 2026| |**Amazon**|[Capacity To Ship Packages Within D Days](https://www.fastprep.io/problems/amazon-capacity-to-ship-packages-within-d-days)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-capacity-to-ship-packages-within-d-days)|๐Ÿ†• Sep 24, 2026| |**Amazon**|[Minimum Cost for Roads and Hospitals](https://www.fastprep.io/problems/amazon-roads-and-hospitals-minimum-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-roads-and-hospitals-minimum-cost)|๐Ÿ†• Sep 24, 2026| |**Amazon**|[Select K Paired Indices for Maximum Score](https://www.fastprep.io/problems/amazon-select-k-paired-array-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-select-k-paired-array-score)|๐Ÿ†• Sep 24, 2026| |**GoodScore**|[Counting Bits](https://www.fastprep.io/problems/goodscore-counting-bits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goodscore-counting-bits)|๐Ÿ†• Sep 24, 2026| |**GoodScore**|[Minimum Jumps to Reach Home](https://www.fastprep.io/problems/goodscore-minimum-jumps-to-reach-home)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goodscore-minimum-jumps-to-reach-home)|๐Ÿ†• Sep 24, 2026| |**Groww**|[Sliding Window Maximum](https://www.fastprep.io/problems/groww-sliding-window-maximum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/groww-sliding-window-maximum)|๐Ÿ†• Sep 24, 2026| |**Morgan Stanley**|[Generate Strings of Length at Least Three](https://www.fastprep.io/problems/morgan-stanley-generate-strings-length-at-least-three)|Coding|[![Practice][p]](https://www.fastprep.io/problems/morgan-stanley-generate-strings-length-at-least-three)|๐Ÿ†• Sep 24, 2026| |**Morgan Stanley**|[Three-Resource 0/1 Knapsack](https://www.fastprep.io/problems/morgan-stanley-three-resource-knapsack)|Coding|[![Practice][p]](https://www.fastprep.io/problems/morgan-stanley-three-resource-knapsack)|๐Ÿ†• Sep 24, 2026| |**PhonePe**|[Identify Two Failing Tests From an Oracle Transcript](https://www.fastprep.io/problems/phonepe-identify-two-failing-tests-from-transcript)|Coding|[![Practice][p]](https://www.fastprep.io/problems/phonepe-identify-two-failing-tests-from-transcript)|๐Ÿ†• Sep 24, 2026| |**Amazon**|[Get Minimum Amount](https://www.fastprep.io/problems/amazon-get-min-amount)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-get-min-amount)|๐Ÿ†• Sep 24, 2026| |**Apple**|[Design an Asynchronous Cloud Resource API](https://www.fastprep.io/system-design/asynchronous-cloud-resource-api)|System design|[![Practice][p]](https://www.fastprep.io/system-design/asynchronous-cloud-resource-api)|๐Ÿ†• Sep 24, 2026| |**Decagon**|[Batch API Requests with Retry Delays](https://www.fastprep.io/problems/decagon-batched-api-retries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/decagon-batched-api-retries)|๐Ÿ†• Sep 24, 2026| |**Stripe**|[Parse Boolean Rule Expressions](https://www.fastprep.io/problems/stripe-rule-expression-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-rule-expression-parser)|๐Ÿ†• Sep 23, 2026| |**Salesforce**|[Minimum Unique-Character Segments After Deletion](https://www.fastprep.io/problems/salesforce-minimum-unique-segments-after-deletion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-minimum-unique-segments-after-deletion)|๐Ÿ†• Sep 23, 2026| |**Microsoft**|[Copy File Bytes with Partial Writes](https://www.fastprep.io/problems/microsoft-copy-file-bytes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-copy-file-bytes)|๐Ÿ†• Sep 23, 2026| |**Microsoft**|[Longest Repeating Character Replacement](https://www.fastprep.io/problems/microsoft-longest-repeating-character-replacement)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-longest-repeating-character-replacement)|๐Ÿ†• Sep 23, 2026| |**StackAdapt**|[Build a Tree from Preorder and Inorder Traversals](https://www.fastprep.io/problems/stackadapt-build-tree-from-preorder-inorder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stackadapt-build-tree-from-preorder-inorder)|๐Ÿ†• Sep 23, 2026| |**StackAdapt**|[Maximum Bananas Delivered by a Camel](https://www.fastprep.io/problems/stackadapt-camel-bananas)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stackadapt-camel-bananas)|๐Ÿ†• Sep 23, 2026| |**StackAdapt**|[Reservoir Sampling with Recorded Draws](https://www.fastprep.io/problems/stackadapt-reservoir-sampling-with-recorded-draws)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stackadapt-reservoir-sampling-with-recorded-draws)|๐Ÿ†• Sep 23, 2026| |**Vercel**|[Order DAG Nodes from Leaves to Roots](https://www.fastprep.io/problems/vercel-leaves-to-root-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/vercel-leaves-to-root-order)|๐Ÿ†• Sep 23, 2026| |**Amazon**|[Minimum Edge Moves to Connect a Network](https://www.fastprep.io/problems/amazon-minimum-edge-moves-to-connect-graph)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-edge-moves-to-connect-graph)|๐Ÿ†• Sep 23, 2026| |**Amazon**|[Simplify a Binary Expression Tree](https://www.fastprep.io/problems/amazon-simplify-expression-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-simplify-expression-tree)|๐Ÿ†• Sep 23, 2026| |**Mercor**|[Currency Conversion Rate](https://www.fastprep.io/problems/mercor-currency-conversion-rate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-currency-conversion-rate)|๐Ÿ†• Sep 23, 2026| |**Google**|[Universal Exit Command Sequence](https://www.fastprep.io/problems/google-universal-exit-command-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-universal-exit-command-sequence)|๐Ÿ†• Sep 23, 2026| |**Pinterest**|[Shortest Pin Path Through Topics](https://www.fastprep.io/problems/pinterest-topic-pin-shortest-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-topic-pin-shortest-path)|๐Ÿ†• Sep 23, 2026| |**LinkedIn**|[Find the Intersection Node of Two Linked Lists](https://www.fastprep.io/problems/linkedin-linked-list-intersection-node)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-linked-list-intersection-node)|๐Ÿ†• Sep 23, 2026| |**LinkedIn**|[Permutations II](https://www.fastprep.io/problems/linkedin-unique-permutations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-unique-permutations)|๐Ÿ†• Sep 23, 2026| |**Remitly**|[Rebalance Bank Accounts to a Minimum Balance](https://www.fastprep.io/problems/remitly-minimum-balance-transfers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/remitly-minimum-balance-transfers)|๐Ÿ†• Sep 23, 2026| |**Circle**|[Banking System with Pending Transfer Acceptance](https://www.fastprep.io/problems/circle-banking-pending-transfers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/circle-banking-pending-transfers)|๐Ÿ†• Sep 23, 2026| |**Apple**|[Design Authentication Manager](https://www.fastprep.io/problems/apple-authentication-manager)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-authentication-manager)|๐Ÿ†• Sep 23, 2026| |**Apple**|[Unit Conversion Across Independent Families](https://www.fastprep.io/problems/apple-unit-conversion-across-families)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-unit-conversion-across-families)|๐Ÿ†• Sep 23, 2026| |**Google**|[Best Anagram Match](https://www.fastprep.io/problems/google-best-anagram-match)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-best-anagram-match)|๐Ÿ†• Sep 23, 2026| |**ByteDance**|[Tic-Tac-Toe Game Over](https://www.fastprep.io/problems/bytedance-tic-tac-toe-game-over)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-tic-tac-toe-game-over)|๐Ÿ†• Sep 23, 2026| |**Amazon**|[Environment Variable Store and Substitution](https://www.fastprep.io/problems/amazon-environment-variable-substitution)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-environment-variable-substitution)|๐Ÿ†• Sep 23, 2026| |**NinjaTrader**|[Server Log Summary and Minute Anomalies](https://www.fastprep.io/problems/ninjatrader-server-log-analyzer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ninjatrader-server-log-analyzer)|๐Ÿ†• Sep 23, 2026| |**eBay**|[Maximum Size Subarray Sum Equals K](https://www.fastprep.io/problems/ebay-maximum-length-subarray-sum-k)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ebay-maximum-length-subarray-sum-k)|๐Ÿ†• Sep 23, 2026| |**Netflix**|[Capacity-Limited Timed Cache](https://www.fastprep.io/problems/netflix-capacity-limited-timed-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-capacity-limited-timed-cache)|๐Ÿ†• Sep 23, 2026| |**Amazon / Postman**|[Social News Feed With Live Engagement](https://www.fastprep.io/system-design/social-news-feed-with-live-engagement)|System design|[![Practice][p]](https://www.fastprep.io/system-design/social-news-feed-with-live-engagement)|๐Ÿ†• Sep 23, 2026| |**ByteDance / Groww**|[Design an Event Booking and Analytics Platform](https://www.fastprep.io/system-design/event-booking-and-analytics-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/event-booking-and-analytics-platform)|๐Ÿ†• Sep 23, 2026| |**Coupa Software**|[Design and Implement an Immutable Customer Profile](https://www.fastprep.io/low-level-design/immutable-customer-profile-value-object)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/immutable-customer-profile-value-object)|๐Ÿ†• Sep 23, 2026| |**Visa**|[Total Server Downtime](https://www.fastprep.io/problems/visa-total-server-downtime)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-total-server-downtime)|๐Ÿ†• Sep 23, 2026| |**Superhuman**|[Longest Distinct String](https://www.fastprep.io/problems/superhuman-longest-distinct-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/superhuman-longest-distinct-string)|๐Ÿ†• Sep 23, 2026| |**Superhuman**|[Minimum Time on Two Processors](https://www.fastprep.io/problems/superhuman-minimum-two-processor-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/superhuman-minimum-two-processor-time)|๐Ÿ†• Sep 23, 2026| |**Superhuman**|[Top Mutual-Friend Recommendations](https://www.fastprep.io/problems/superhuman-mutual-friend-recommendations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/superhuman-mutual-friend-recommendations)|๐Ÿ†• Sep 23, 2026| |**Visa**|[Longest String Chain](https://www.fastprep.io/problems/visa-longest-string-chain)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-longest-string-chain)|๐Ÿ†• Sep 23, 2026| |**Visa**|[Maximum Three-Server Difficulty Score](https://www.fastprep.io/problems/visa-maximum-three-server-difficulty-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-maximum-three-server-difficulty-score)|๐Ÿ†• Sep 23, 2026| |**Visa**|[Minimize Malware Spread by Removing a Node](https://www.fastprep.io/problems/visa-minimize-malware-spread)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-minimize-malware-spread)|๐Ÿ†• Sep 23, 2026| |**Microsoft**|[Nearby Restaurant Search Service](https://www.fastprep.io/system-design/nearby-restaurant-search-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/nearby-restaurant-search-service)|๐Ÿ†• Sep 23, 2026| |**Scribd / PostHog / Vanta / Attentive / Atlassian / Wayfair**|[Design a Product Feature Event Analytics Platform](https://www.fastprep.io/system-design/product-feature-event-analytics-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/product-feature-event-analytics-platform)|๐Ÿ†• Sep 23, 2026| |**Microsoft**|[Design a Desktop Application Notification System](https://www.fastprep.io/system-design/desktop-application-notification-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/desktop-application-notification-system)|๐Ÿ†• Sep 23, 2026| |**Google**|[Design a Smile-Detection Evaluation Platform](https://www.fastprep.io/system-design/smile-detection-evaluation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/smile-detection-evaluation-platform)|๐Ÿ†• Sep 23, 2026| |**Abnormal Security / Apple / Indeed**|[Evolve a Read-Write Record Service](https://www.fastprep.io/system-design/read-write-service-scaling-review)|System design|[![Practice][p]](https://www.fastprep.io/system-design/read-write-service-scaling-review)|๐Ÿ†• Sep 23, 2026| |**Pinterest**|[Design a Feedback-Aware Cluster Workload Scheduler](https://www.fastprep.io/system-design/feedback-aware-kubernetes-workload-scheduler)|System design|[![Practice][p]](https://www.fastprep.io/system-design/feedback-aware-kubernetes-workload-scheduler)|๐Ÿ†• Sep 23, 2026| |**Atlassian**|[Design a Searchable Emoji Picker](https://www.fastprep.io/system-design/searchable-emoji-picker-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/searchable-emoji-picker-service)|๐Ÿ†• Sep 23, 2026| |**Instacart**|[Evaluate Formulas with Cycle Detection](https://www.fastprep.io/problems/instacart-evaluate-formulas-with-cycle-detection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/instacart-evaluate-formulas-with-cycle-detection)|๐Ÿ†• Sep 23, 2026| |**Instacart**|[Product Total With the Cheapest Promotion](https://www.fastprep.io/problems/instacart-product-total-with-cheapest-promotion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/instacart-product-total-with-cheapest-promotion)|๐Ÿ†• Sep 23, 2026| |**Instacart**|[Process Shopping Records, Promotions, and Display Order](https://www.fastprep.io/problems/instacart-shopping-record-promotions-and-ordering)|Coding|[![Practice][p]](https://www.fastprep.io/problems/instacart-shopping-record-promotions-and-ordering)|๐Ÿ†• Sep 23, 2026| |**Instacart**|[Sort Products by Aisle With Frozen Items Last](https://www.fastprep.io/problems/instacart-sort-products-by-aisle-with-frozen-last)|Coding|[![Practice][p]](https://www.fastprep.io/problems/instacart-sort-products-by-aisle-with-frozen-last)|๐Ÿ†• Sep 23, 2026| |**Google**|[Find Duplicate Element Pairs](https://www.fastprep.io/problems/google-find-duplicate-element-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-find-duplicate-element-pairs)|๐Ÿ†• Sep 23, 2026| |**Amazon**|[LRU Cache for Query Results](https://www.fastprep.io/problems/amazon-lru-query-result-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-lru-query-result-cache)|๐Ÿ†• Sep 23, 2026| |**Google**|[Shortest Subarray With a Target Remainder](https://www.fastprep.io/problems/google-shortest-subarray-target-remainder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-subarray-target-remainder)|๐Ÿ†• Sep 23, 2026| |**Stripe**|[Complete a Reconciliation Integration](https://www.fastprep.io/project-coding/stripe-balance-reconciliation-integration)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/stripe-balance-reconciliation-integration)|๐Ÿ†• Sep 23, 2026| |**Google**|[Three Sum: Unique Zero-Sum Triplets](https://www.fastprep.io/problems/google-three-sum-zero-unique-triplets)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-three-sum-zero-unique-triplets)|๐Ÿ†• Sep 22, 2026| |**Google**|[Binary Tree Level Order Traversal](https://www.fastprep.io/problems/google-binary-tree-level-order-traversal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-binary-tree-level-order-traversal)|๐Ÿ†• Sep 22, 2026| |**Harvey**|[Design Human-Governed File Review Agents](https://www.fastprep.io/system-design/human-governed-file-review-agents)|System design|[![Practice][p]](https://www.fastprep.io/system-design/human-governed-file-review-agents)|๐Ÿ†• Sep 22, 2026| |**PayPay**|[Design a Coupon Generation and Redemption Service](https://www.fastprep.io/system-design/coupon-generation-and-redemption-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/coupon-generation-and-redemption-service)|๐Ÿ†• Sep 22, 2026| |**Postman**|[Design an API Request Workspace](https://www.fastprep.io/system-design/api-request-workspace)|System design|[![Practice][p]](https://www.fastprep.io/system-design/api-request-workspace)|๐Ÿ†• Sep 22, 2026| |**Mercor**|[Design Context Window Management for an AI Assistant](https://www.fastprep.io/system-design/llm-context-window-management)|System design|[![Practice][p]](https://www.fastprep.io/system-design/llm-context-window-management)|๐Ÿ†• Sep 22, 2026| |**Snowflake**|[Design Memory for an AI Assistant](https://www.fastprep.io/system-design/agent-memory-architecture)|System design|[![Practice][p]](https://www.fastprep.io/system-design/agent-memory-architecture)|๐Ÿ†• Sep 22, 2026| |**Mercor**|[Design Prompt Injection Defenses for an AI Agent](https://www.fastprep.io/system-design/ai-agent-prompt-injection-defense)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ai-agent-prompt-injection-defense)|๐Ÿ†• Sep 22, 2026| |**PayPay**|[Design a Pluggable Random Value Library](https://www.fastprep.io/low-level-design/pluggable-random-value-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/pluggable-random-value-library)|๐Ÿ†• Sep 22, 2026| |**Verkada**|[Build a Camera Communication API](https://www.fastprep.io/project-coding/verkada-camera-log-api-server)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/verkada-camera-log-api-server)|๐Ÿ†• Sep 22, 2026| |**Cresta**|[Build a Conversational Flight Booking Agent](https://www.fastprep.io/project-coding/cresta-conversational-flight-booking-agent)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/cresta-conversational-flight-booking-agent)|๐Ÿ†• Sep 22, 2026| |**Intuit**|[Oldest and Youngest Employees](https://www.fastprep.io/problems/intuit-oldest-and-youngest-employees)|SQL|[![Practice][p]](https://www.fastprep.io/problems/intuit-oldest-and-youngest-employees)|๐Ÿ†• Sep 22, 2026| |**Intuit**|[Pressure-Isolation Shutdown Order](https://www.fastprep.io/problems/intuit-pressure-isolation-shutdown-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/intuit-pressure-isolation-shutdown-order)|๐Ÿ†• Sep 22, 2026| |**Intuit**|[Submask Sum Queries](https://www.fastprep.io/problems/intuit-submask-sum-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/intuit-submask-sum-queries)|๐Ÿ†• Sep 22, 2026| |**Google**|[Minimize Absolute Difference of Server Loads](https://www.fastprep.io/problems/google-minimize-absolute-difference-of-server-loads)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-minimize-absolute-difference-of-server-loads)|๐Ÿ†• Sep 22, 2026| |**Google**|[Decreasing Subsequences](https://www.fastprep.io/problems/google-split-array-into-consecutive-subsequences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-split-array-into-consecutive-subsequences)|๐Ÿ†• Sep 22, 2026| |**Hudson River Trading**|[Product Minus Sum of Digits](https://www.fastprep.io/problems/hrt-product-minus-sum-of-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-product-minus-sum-of-digits)|๐Ÿ†• Sep 22, 2026| |**Hudson River Trading**|[Rightmost Longest Character Run](https://www.fastprep.io/problems/hrt-rightmost-longest-character-run)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-rightmost-longest-character-run)|๐Ÿ†• Sep 22, 2026| |**Cursor**|[Filesystem Hash Tree](https://www.fastprep.io/problems/cursor-filesystem-hash-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cursor-filesystem-hash-tree)|๐Ÿ†• Sep 22, 2026| |**Amazon**|[Path Through an O/X Grid Using Only Right and Down](https://www.fastprep.io/problems/amazon-right-down-grid-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-right-down-grid-path)|๐Ÿ†• Sep 22, 2026| |**Cursor**|[Diff Two Filesystem Hash Trees](https://www.fastprep.io/problems/cursor-filesystem-merkle-diff)|Coding|[![Practice][p]](https://www.fastprep.io/problems/cursor-filesystem-merkle-diff)|๐Ÿ†• Sep 22, 2026| |**Ease**|[Linear-Probing Key-Value Store](https://www.fastprep.io/problems/ease-linear-probing-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ease-linear-probing-key-value-store)|๐Ÿ†• Sep 22, 2026| |**Fivetran**|[Execute In-Memory SQL Storage Operations](https://www.fastprep.io/problems/fivetran-sql-engine-storage-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/fivetran-sql-engine-storage-operations)|๐Ÿ†• Sep 22, 2026| |**Google**|[Most Active Caller by Distinct Contacts](https://www.fastprep.io/problems/google-most-active-caller-by-distinct-contacts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-most-active-caller-by-distinct-contacts)|๐Ÿ†• Sep 22, 2026| |**Google**|[Top K Users by Distinct Contacts](https://www.fastprep.io/problems/google-top-k-users-by-distinct-contacts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-top-k-users-by-distinct-contacts)|๐Ÿ†• Sep 22, 2026| |**Harvey**|[Retrieve Vectors by Cosine Similarity](https://www.fastprep.io/problems/harvey-cosine-similarity-retrieval)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-cosine-similarity-retrieval)|๐Ÿ†• Sep 22, 2026| |**Mercor**|[Process Refunds with Bounded Retries](https://www.fastprep.io/problems/mercor-refund-retry-state)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercor-refund-retry-state)|๐Ÿ†• Sep 22, 2026| |**Netflix**|[Convert Sparse Records to a Filled Table](https://www.fastprep.io/problems/netflix-records-to-filled-table)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-records-to-filled-table)|๐Ÿ†• Sep 22, 2026| |**Netflix**|[Sparse Matrix Multiplication](https://www.fastprep.io/problems/netflix-sparse-matrix-multiplication)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-sparse-matrix-multiplication)|๐Ÿ†• Sep 22, 2026| |**OpenAI**|[Iterate Canonical IPv6 Addresses](https://www.fastprep.io/problems/openai-ipv6-address-iterator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-ipv6-address-iterator)|๐Ÿ†• Sep 22, 2026| |**Physical Intelligence**|[LRU Cache Operations](https://www.fastprep.io/problems/physical-intelligence-lru-cache-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/physical-intelligence-lru-cache-operations)|๐Ÿ†• Sep 22, 2026| |**Snowflake**|[Sliding-Window Rate Limiter](https://www.fastprep.io/problems/snowflake-sliding-window-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-sliding-window-rate-limiter)|๐Ÿ†• Sep 22, 2026| |**Stripe**|[Validate Six-Column Business CSV Rows](https://www.fastprep.io/problems/stripe-business-csv-rule-validator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-business-csv-rule-validator)|๐Ÿ†• Sep 22, 2026| |**Visa**|[Shortest Digit Prefix for Target Multisets](https://www.fastprep.io/problems/visa-shortest-digit-prefix-for-targets)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-shortest-digit-prefix-for-targets)|๐Ÿ†• Sep 22, 2026| |**Google**|[Design and Implement an Extensible Order Sales Counter](https://www.fastprep.io/low-level-design/extensible-order-sales-counter)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/extensible-order-sales-counter)|๐Ÿ†• Sep 22, 2026| |**Google**|[Blocking Connection Pool Operation Trace](https://www.fastprep.io/problems/google-blocking-connection-pool-trace)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-blocking-connection-pool-trace)|๐Ÿ†• Sep 22, 2026| |**Google**|[Subtract One Half-Open Interval from Another](https://www.fastprep.io/problems/google-subtract-half-open-interval)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-subtract-half-open-interval)|๐Ÿ†• Sep 21, 2026| |**Google**|[Maximal Rectangle in a Binary Matrix](https://www.fastprep.io/problems/google-maximal-rectangle-in-binary-matrix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-maximal-rectangle-in-binary-matrix)|๐Ÿ†• Sep 21, 2026| |**Google**|[BST to Sorted Circular Doubly Linked List](https://www.fastprep.io/problems/google-bst-to-circular-doubly-linked-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-bst-to-circular-doubly-linked-list)|๐Ÿ†• Sep 21, 2026| |**JP Morgan Chase / Google / Decagon**|[Internal AI Assistant for Employees](https://www.fastprep.io/system-design/internal-ai-assistant-for-employees)|System design|[![Practice][p]](https://www.fastprep.io/system-design/internal-ai-assistant-for-employees)|๐Ÿ†• Sep 21, 2026| |**Tesla**|[Monorepo Build and Vehicle Software Rollout](https://www.fastprep.io/system-design/monorepo-build-and-vehicle-rollout)|System design|[![Practice][p]](https://www.fastprep.io/system-design/monorepo-build-and-vehicle-rollout)|๐Ÿ†• Sep 21, 2026| |**Pinterest**|[Implement a Product Read-Through Cache](https://www.fastprep.io/project-coding/pinterest-product-read-through-cache)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/pinterest-product-read-through-cache)|๐Ÿ†• Sep 21, 2026| |**Abnormal Security / Ninja Van / Checkr**|[Concurrent Worker Processing Platform](https://www.fastprep.io/system-design/concurrent-worker-processing-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/concurrent-worker-processing-platform)|๐Ÿ†• Sep 21, 2026| |**Pinterest**|[In-Memory Typeahead Trie Service](https://www.fastprep.io/system-design/in-memory-typeahead-trie-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/in-memory-typeahead-trie-service)|๐Ÿ†• Sep 21, 2026| |**Tekion**|[Design and Implement a TTL Cache Library](https://www.fastprep.io/low-level-design/in-memory-ttl-cache-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-ttl-cache-library)|๐Ÿ†• Sep 21, 2026| |**Amazon**|[Edit Distance](https://www.fastprep.io/problems/amazon-edit-distance)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-edit-distance)|๐Ÿ†• Sep 21, 2026| |**Amazon**|[Word Ladder](https://www.fastprep.io/problems/amazon-word-ladder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-word-ladder)|๐Ÿ†• Sep 21, 2026| |**Amazon**|[Trapping Rain Water](https://www.fastprep.io/problems/amazon-trapping-rain-water)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-trapping-rain-water)|๐Ÿ†• Sep 21, 2026| |**Amazon**|[Allocate Minimum Pages](https://www.fastprep.io/problems/amazon-allocate-minimum-pages)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-allocate-minimum-pages)|๐Ÿ†• Sep 21, 2026| |**Amazon**|[Longest Subarray with K Distinct Values](https://www.fastprep.io/problems/amazon-longest-subarray-with-k-distinct)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-longest-subarray-with-k-distinct)|๐Ÿ†• Sep 21, 2026| |**Tekion**|[Largest Rectangle in Histogram](https://www.fastprep.io/problems/tekion-largest-rectangle-in-histogram)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tekion-largest-rectangle-in-histogram)|๐Ÿ†• Sep 21, 2026| |**Tekion**|[Next Greater Element to the Right](https://www.fastprep.io/problems/tekion-next-greater-elements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tekion-next-greater-elements)|๐Ÿ†• Sep 21, 2026| |**Visa**|[Sum of Index-Ordered Pair Differences](https://www.fastprep.io/problems/visa-sum-of-index-pair-differences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/visa-sum-of-index-pair-differences)|๐Ÿ†• Sep 21, 2026| |**Tesla**|[Flatten a Branched List into a Doubly Linked List](https://www.fastprep.io/problems/tesla-flatten-branched-linked-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tesla-flatten-branched-linked-list)|๐Ÿ†• Sep 21, 2026| |**Oscar Health**|[Longest Name Chain in a Directed Acyclic Graph](https://www.fastprep.io/problems/oscar-health-longest-name-chain)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oscar-health-longest-name-chain)|๐Ÿ†• Sep 21, 2026| |**OpenAI**|[GPU Credit Ledger](https://www.fastprep.io/problems/openai-gpu-credit-ledger)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-gpu-credit-ledger)|๐Ÿ†• Sep 21, 2026| |**Apple**|[First Successful Concurrent API Result Before a Timeout](https://www.fastprep.io/problems/apple-first-successful-api-with-timeout)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-first-successful-api-with-timeout)|๐Ÿ†• Sep 21, 2026| |**Waymo**|[Vehicle Maintenance Event Readiness](https://www.fastprep.io/problems/waymo-maintenance-event-readiness)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-maintenance-event-readiness)|๐Ÿ†• Sep 21, 2026| |**Pinterest**|[Shortest Way to Form a Target String](https://www.fastprep.io/problems/pinterest-shortest-way-to-form-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-shortest-way-to-form-string)|๐Ÿ†• Sep 21, 2026| |**Pinterest**|[Escape Room Leaderboard](https://www.fastprep.io/problems/pinterest-escape-room-leaderboard)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-escape-room-leaderboard)|๐Ÿ†• Sep 21, 2026| |**Pinterest**|[Policy Violation Set Checks](https://www.fastprep.io/problems/pinterest-policy-violation-set-checks)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-policy-violation-set-checks)|๐Ÿ†• Sep 21, 2026| |**Affirm**|[Assign Sequential Loan Identifiers](https://www.fastprep.io/problems/affirm-assign-sequential-loan-identifiers)|Coding|[![Practice][p]](https://www.fastprep.io/problems/affirm-assign-sequential-loan-identifiers)|๐Ÿ†• Sep 21, 2026| |**Affirm**|[Normalize Loan Merchants to Root Businesses](https://www.fastprep.io/problems/affirm-normalize-loan-merchants-to-root-business)|Coding|[![Practice][p]](https://www.fastprep.io/problems/affirm-normalize-loan-merchants-to-root-business)|๐Ÿ†• Sep 21, 2026| |**Google**|[Design a Document Find Session](https://www.fastprep.io/low-level-design/document-find-session)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/document-find-session)|๐Ÿ†• Sep 21, 2026| |**Google**|[Filesystem Entity Total Size](https://www.fastprep.io/problems/google-filesystem-entity-total-size)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-filesystem-entity-total-size)|๐Ÿ†• Sep 21, 2026| |**Decagon**|[Recipe Cart with Undo and Redo](https://www.fastprep.io/problems/decagon-recipe-cart-undo-redo)|Coding|[![Practice][p]](https://www.fastprep.io/problems/decagon-recipe-cart-undo-redo)|๐Ÿ†• Sep 21, 2026| |**Mercury**|[Sliding Window Rate Limiter](https://www.fastprep.io/problems/mercury-sliding-window-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/mercury-sliding-window-rate-limiter)|๐Ÿ†• Sep 20, 2026| |**Amazon / Meta / ByteDance / Harvey / Clio / Microsoft / Wayfair**|[Design a Cloud File Storage System](https://www.fastprep.io/system-design/cloud-file-storage)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cloud-file-storage)|๐Ÿ†• Sep 20, 2026| |**Google**|[Offline Multi-Device Data Sync](https://www.fastprep.io/system-design/offline-multi-device-data-sync)|System design|[![Practice][p]](https://www.fastprep.io/system-design/offline-multi-device-data-sync)|๐Ÿ†• Sep 20, 2026| |**Amazon**|[Repair MovieDB Follows and Notifications](https://www.fastprep.io/project-coding/amazon-repair-moviedb-follows-notifications)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/amazon-repair-moviedb-follows-notifications)|๐Ÿ†• Sep 20, 2026| |**Capital One**|[Obstacle Placement Queries](https://www.fastprep.io/problems/capital-one-obstacle-placement-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-obstacle-placement-queries)|๐Ÿ†• Sep 20, 2026| |**Harvey**|[Highlight and Rank Overlapping Citations](https://www.fastprep.io/problems/harvey-rank-citations-by-word-overlap)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-rank-citations-by-word-overlap)|๐Ÿ†• Sep 20, 2026| |**BlackRock**|[Lowest Common Ancestor in a Parent Tree](https://www.fastprep.io/problems/blackrock-lowest-common-ancestor-parent-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/blackrock-lowest-common-ancestor-parent-tree)|๐Ÿ†• Sep 20, 2026| |**BlackRock**|[Valid Parentheses](https://www.fastprep.io/problems/blackrock-valid-parentheses)|Coding|[![Practice][p]](https://www.fastprep.io/problems/blackrock-valid-parentheses)|๐Ÿ†• Sep 20, 2026| |**Capital One**|[Circular High-Low Pattern](https://www.fastprep.io/problems/capital-one-circular-high-low-pattern)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-circular-high-low-pattern)|๐Ÿ†• Sep 20, 2026| |**Citadel**|[Merge Price-Delta Feeds](https://www.fastprep.io/problems/citadel-merge-price-delta-feeds)|Coding|[![Practice][p]](https://www.fastprep.io/problems/citadel-merge-price-delta-feeds)|๐Ÿ†• Sep 20, 2026| |**Harvey**|[Evaluate an Expression Map](https://www.fastprep.io/problems/harvey-evaluate-expression-map)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-evaluate-expression-map)|๐Ÿ†• Sep 20, 2026| |**Harvey**|[Find Duplicate Files in a Filesystem](https://www.fastprep.io/problems/harvey-find-duplicate-files)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-find-duplicate-files)|๐Ÿ†• Sep 20, 2026| |**Harvey**|[Highlight Matching Phrases](https://www.fastprep.io/problems/harvey-highlight-sentence-matches)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-highlight-sentence-matches)|๐Ÿ†• Sep 20, 2026| |**Harvey**|[In-Memory Vault File System](https://www.fastprep.io/problems/harvey-in-memory-vault-file-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/harvey-in-memory-vault-file-system)|๐Ÿ†• Sep 20, 2026| |**Rippling**|[Numeric Poker Operations](https://www.fastprep.io/problems/rippling-numeric-poker-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-numeric-poker-operations)|๐Ÿ†• Sep 20, 2026| |**Snap Inc.**|[Render an Org Chart and Find Skip-Level Pairs](https://www.fastprep.io/problems/snap-inc-org-chart-and-skip-level-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snap-inc-org-chart-and-skip-level-pairs)|๐Ÿ†• Sep 20, 2026| |**Kotak Mahindra Bank**|[Course Schedule](https://www.fastprep.io/problems/kotak-mahindra-bank-course-schedule)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-mahindra-bank-course-schedule)|๐Ÿ†• Sep 20, 2026| |**Kotak Mahindra Bank**|[House Robber II](https://www.fastprep.io/problems/kotak-mahindra-bank-house-robber-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-mahindra-bank-house-robber-ii)|๐Ÿ†• Sep 20, 2026| |**Kotak Mahindra Bank**|[Trapping Rain Water](https://www.fastprep.io/problems/kotak-mahindra-bank-trapping-rain-water)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kotak-mahindra-bank-trapping-rain-water)|๐Ÿ†• Sep 20, 2026| |**Figma**|[Layer History with Batch Undo and Redo](https://www.fastprep.io/problems/figma-layer-history)|Coding|[![Practice][p]](https://www.fastprep.io/problems/figma-layer-history)|๐Ÿ†• Sep 20, 2026| |**Google**|[First Missing Positive](https://www.fastprep.io/problems/google-first-missing-positive)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-first-missing-positive)|๐Ÿ†• Sep 20, 2026| |**Google**|[Latest Arrival Time for a Shuttle](https://www.fastprep.io/problems/google-latest-shuttle-arrival)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-latest-shuttle-arrival)|๐Ÿ†• Sep 20, 2026| |**Google**|[Reach a Meeting by Scheduled Trains](https://www.fastprep.io/problems/google-scheduled-train-meeting-reachability)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-scheduled-train-meeting-reachability)|๐Ÿ†• Sep 20, 2026| |**Google**|[Reverse Vowels of a String](https://www.fastprep.io/problems/google-reverse-vowels-of-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-reverse-vowels-of-string)|๐Ÿ†• Sep 20, 2026| |**Google**|[Random Picks Excluding Recent Values](https://www.fastprep.io/problems/google-random-pick-excluding-recent)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-random-pick-excluding-recent)|๐Ÿ†• Sep 20, 2026| |**Stripe**|[WebSocket Load Balancer โ€” Parts 1โ€“5](https://www.fastprep.io/problems/stripe-websocket-load-balancer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-websocket-load-balancer)|๐Ÿ†• Sep 20, 2026| |**GoodScore**|[Count Divisible Power Sums](https://www.fastprep.io/problems/goodscore-count-divisible-power-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goodscore-count-divisible-power-sums)|๐Ÿ†• Sep 19, 2026| |**Stripe**|[Incident Monitor](https://www.fastprep.io/problems/stripe-incident-monitor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-incident-monitor)|๐Ÿ†• Sep 19, 2026| |**Databricks**|[Chat API and Database System](https://www.fastprep.io/system-design/chat-api-and-database-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/chat-api-and-database-system)|๐Ÿ†• Sep 19, 2026| |**Microsoft / Decagon**|[AI Receptionist Voice Chat](https://www.fastprep.io/system-design/ai-receptionist-voice-chat-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/ai-receptionist-voice-chat-system)|๐Ÿ†• Sep 19, 2026| |**Airbnb**|[Customer Support Resolution Assistant](https://www.fastprep.io/system-design/customer-support-resolution-rag-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/customer-support-resolution-rag-system)|๐Ÿ†• Sep 19, 2026| |**Walleye Capital**|[Equity Research Decision Intelligence](https://www.fastprep.io/system-design/equity-research-decision-intelligence)|System design|[![Practice][p]](https://www.fastprep.io/system-design/equity-research-decision-intelligence)|๐Ÿ†• Sep 19, 2026| |**Microsoft / Optiver**|[Global One-to-One Voice Calling](https://www.fastprep.io/system-design/global-one-to-one-voice-calling-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/global-one-to-one-voice-calling-system)|๐Ÿ†• Sep 19, 2026| |**Atlassian**|[Social Post Comments](https://www.fastprep.io/system-design/social-post-comments-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/social-post-comments-system)|๐Ÿ†• Sep 19, 2026| |**Airbnb**|[Vacation Rental Candidate Ranking](https://www.fastprep.io/system-design/vacation-rental-candidate-ranking-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/vacation-rental-candidate-ranking-system)|๐Ÿ†• Sep 19, 2026| |**Capital One**|[Rank Flights by Airline and Destination Frequency](https://www.fastprep.io/problems/capital-one-rank-flights-by-airline-and-destination)|SQL|[![Practice][p]](https://www.fastprep.io/problems/capital-one-rank-flights-by-airline-and-destination)|๐Ÿ†• Sep 19, 2026| |**Hudson River Trading**|[Sorted Absolute-Difference Sums Across Cyclic Shifts](https://www.fastprep.io/problems/hrt-cyclic-shift-absolute-difference-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-cyclic-shift-absolute-difference-sums)|๐Ÿ†• Sep 19, 2026| |**Hudson River Trading**|[Minimize Expression Value with Parentheses](https://www.fastprep.io/problems/hrt-minimize-expression-value-with-parentheses)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-minimize-expression-value-with-parentheses)|๐Ÿ†• Sep 19, 2026| |**Hudson River Trading**|[Obstacle Placement Queries](https://www.fastprep.io/problems/hrt-obstacle-placement-queries)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-obstacle-placement-queries)|๐Ÿ†• Sep 19, 2026| |**Amazon**|[Maximize Adjacent Difference With One Reversal](https://www.fastprep.io/problems/amazon-maximize-adjacent-difference-with-one-reversal)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximize-adjacent-difference-with-one-reversal)|๐Ÿ†• Sep 19, 2026| |**Amazon**|[Shortest Grid Path With One Wall Break](https://www.fastprep.io/problems/amazon-shortest-grid-path-with-one-wall-break)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-shortest-grid-path-with-one-wall-break)|๐Ÿ†• Sep 19, 2026| |**Airbnb**|[Print Sentences as Table](https://www.fastprep.io/problems/airbnb-print-sentences-as-table)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-print-sentences-as-table)|๐Ÿ†• Sep 19, 2026| |**Atlassian**|[Music Player Operation Sequence](https://www.fastprep.io/problems/atlassian-music-player-operation-sequence)|Coding|[![Practice][p]](https://www.fastprep.io/problems/atlassian-music-player-operation-sequence)|๐Ÿ†• Sep 19, 2026| |**Databricks**|[Customer Revenue with Direct Referrals](https://www.fastprep.io/problems/databricks-customer-revenue-referrals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/databricks-customer-revenue-referrals)|๐Ÿ†• Sep 19, 2026| |**Indeed**|[Insert into an Unrolled Linked List](https://www.fastprep.io/problems/indeed-unrolled-linked-list-insert)|Coding|[![Practice][p]](https://www.fastprep.io/problems/indeed-unrolled-linked-list-insert)|๐Ÿ†• Sep 19, 2026| |**Microsoft**|[First Duplicate Value](https://www.fastprep.io/problems/microsoft-first-duplicate-value)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-first-duplicate-value)|๐Ÿ†• Sep 19, 2026| |**Microsoft**|[Keyed Bounded Executor Schedule](https://www.fastprep.io/problems/microsoft-keyed-bounded-executor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-keyed-bounded-executor)|๐Ÿ†• Sep 19, 2026| |**Microsoft**|[3Sum](https://www.fastprep.io/problems/microsoft-three-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-three-sum)|๐Ÿ†• Sep 19, 2026| |**Oracle**|[Island Count and Maximum Area](https://www.fastprep.io/problems/oracle-island-count-and-max-area)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-island-count-and-max-area)|๐Ÿ†• Sep 19, 2026| |**Oracle**|[Retry with an Attempt Limit](https://www.fastprep.io/problems/oracle-retry-with-attempt-limit)|Coding|[![Practice][p]](https://www.fastprep.io/problems/oracle-retry-with-attempt-limit)|๐Ÿ†• Sep 19, 2026| |**Google**|[Nth Staged License Plate](https://www.fastprep.io/problems/google-nth-staged-license-plate)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-nth-staged-license-plate)|๐Ÿ†• Sep 19, 2026| |**Google**|[Merge Subsequences Into a Consistent Total Order](https://www.fastprep.io/problems/google-merge-subsequences-into-total-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-merge-subsequences-into-total-order)|๐Ÿ†• Sep 19, 2026| |**Google**|[Delete Leaves With a Target Value](https://www.fastprep.io/problems/google-delete-leaves-with-target-value)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-delete-leaves-with-target-value)|๐Ÿ†• Sep 19, 2026| |**Tata Consultancy Services**|[Maximum Gap After Sorting](https://www.fastprep.io/problems/tata-consultancy-services-maximum-gap)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tata-consultancy-services-maximum-gap)|๐Ÿ†• Sep 18, 2026| |**Tata Consultancy Services**|[EV Charging Cost Optimization](https://www.fastprep.io/problems/tata-consultancy-services-ev-charging-cost-optimization)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tata-consultancy-services-ev-charging-cost-optimization)|๐Ÿ†• Sep 18, 2026| |**Amazon**|[Inventory Allocation](https://www.fastprep.io/problems/amazon-inventory-allocation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-inventory-allocation)|๐Ÿ†• Sep 18, 2026| |**Waymo**|[Obstacle-Aware Return to Origin](https://www.fastprep.io/problems/waymo-obstacle-aware-return-to-origin)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-obstacle-aware-return-to-origin)|๐Ÿ†• Sep 18, 2026| |**Waymo**|[Dictionary Matches from Repeated Letters](https://www.fastprep.io/problems/waymo-repeated-letter-dictionary-matches)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-repeated-letter-dictionary-matches)|๐Ÿ†• Sep 18, 2026| |**Amazon**|[Design a Large-Scale File Change Watcher](https://www.fastprep.io/system-design/large-scale-file-change-watcher)|System design|[![Practice][p]](https://www.fastprep.io/system-design/large-scale-file-change-watcher)|๐Ÿ†• Sep 18, 2026| |**Amazon**|[Design Robot-Assisted Restaurant Orchestration](https://www.fastprep.io/system-design/robot-assisted-restaurant-orchestration)|System design|[![Practice][p]](https://www.fastprep.io/system-design/robot-assisted-restaurant-orchestration)|๐Ÿ†• Sep 18, 2026| |**AMD**|[K Largest Elements with Quickselect](https://www.fastprep.io/problems/amd-k-largest-elements-quickselect)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amd-k-largest-elements-quickselect)|๐Ÿ†• Sep 18, 2026| |**Google**|[Sliding Window Average Excluding the Largest K Values](https://www.fastprep.io/problems/google-sliding-window-average-excluding-largest-k)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-sliding-window-average-excluding-largest-k)|๐Ÿ†• Sep 18, 2026| |**Instacart**|[Timed Task Management](https://www.fastprep.io/problems/instacart-timed-task-management)|Coding|[![Practice][p]](https://www.fastprep.io/problems/instacart-timed-task-management)|๐Ÿ†• Sep 18, 2026| |**Instacart**|[Worker Management with Promotions and Double-Paid Time](https://www.fastprep.io/problems/instacart-worker-management-double-paid-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/instacart-worker-management-double-paid-intervals)|๐Ÿ†• Sep 18, 2026| |**Microsoft**|[Convert Hexadecimal to Dotted IPv4](https://www.fastprep.io/problems/microsoft-hexadecimal-to-ipv4)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-hexadecimal-to-ipv4)|๐Ÿ†• Sep 18, 2026| |**Microsoft**|[Parse a Signed Integer in Any Base](https://www.fastprep.io/problems/microsoft-parse-integer-arbitrary-base)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-parse-integer-arbitrary-base)|๐Ÿ†• Sep 18, 2026| |**Microsoft**|[Reconstruct Digits from Jumbled English Words](https://www.fastprep.io/problems/microsoft-reconstruct-english-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-reconstruct-english-digits)|๐Ÿ†• Sep 18, 2026| |**Microsoft**|[Stable Unique Column Renames](https://www.fastprep.io/problems/microsoft-stable-column-renames)|Coding|[![Practice][p]](https://www.fastprep.io/problems/microsoft-stable-column-renames)|๐Ÿ†• Sep 18, 2026| |**Reddit**|[Straight-Line Word Search](https://www.fastprep.io/problems/reddit-straight-line-word-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/reddit-straight-line-word-search)|๐Ÿ†• Sep 18, 2026| |**Render**|[Top-K IP Addresses Across Log Files](https://www.fastprep.io/problems/render-top-k-ip-addresses-from-logs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/render-top-k-ip-addresses-from-logs)|๐Ÿ†• Sep 18, 2026| |**Robinhood**|[Fractional Share Inventory Flattening](https://www.fastprep.io/problems/robinhood-fractional-share-inventory-flattening)|Coding|[![Practice][p]](https://www.fastprep.io/problems/robinhood-fractional-share-inventory-flattening)|๐Ÿ†• Sep 18, 2026| |**Robinhood**|[Unique Transitive Dependent Counts](https://www.fastprep.io/problems/robinhood-unique-transitive-dependent-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/robinhood-unique-transitive-dependent-counts)|๐Ÿ†• Sep 18, 2026| |**Roblox**|[Candy Crush Grid Matching and Gravity](https://www.fastprep.io/problems/roblox-candy-crush-grid-matching-and-gravity)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-candy-crush-grid-matching-and-gravity)|๐Ÿ†• Sep 18, 2026| |**Roblox**|[Count and Score Distinct Hat Assignments](https://www.fastprep.io/problems/roblox-hat-assignment-count-and-score)|Coding|[![Practice][p]](https://www.fastprep.io/problems/roblox-hat-assignment-count-and-score)|๐Ÿ†• Sep 18, 2026| |**Together AI**|[Balanced File Partitions Without Splitting Lines](https://www.fastprep.io/problems/together-ai-balanced-file-line-partitions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/together-ai-balanced-file-line-partitions)|๐Ÿ†• Sep 18, 2026| |**The Voleon Group**|[Words with Repeated Anagrams](https://www.fastprep.io/problems/voleon-words-with-repeated-anagrams)|Coding|[![Practice][p]](https://www.fastprep.io/problems/voleon-words-with-repeated-anagrams)|๐Ÿ†• Sep 18, 2026| |**Wayfair**|[UCB1 Multi-Armed Bandit Trace](https://www.fastprep.io/problems/wayfair-ucb1-multi-armed-bandit-trace)|Coding|[![Practice][p]](https://www.fastprep.io/problems/wayfair-ucb1-multi-armed-bandit-trace)|๐Ÿ†• Sep 18, 2026| |**Rippling**|[Corporate Card Expense Rules](https://www.fastprep.io/problems/rippling-corporate-card-rules-engine)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-corporate-card-rules-engine)|๐Ÿ†• Sep 18, 2026| |**Amazon**|[Design an Employee Directory and Organization Hierarchy](https://www.fastprep.io/system-design/employee-directory-and-org-hierarchy)|System design|[![Practice][p]](https://www.fastprep.io/system-design/employee-directory-and-org-hierarchy)|๐Ÿ†• Sep 18, 2026| |**JioStar**|[Design Streaming Home Personalization](https://www.fastprep.io/system-design/streaming-home-personalization)|System design|[![Practice][p]](https://www.fastprep.io/system-design/streaming-home-personalization)|๐Ÿ†• Sep 18, 2026| |**JioStar**|[Design and Implement a Parameterized Configuration Library](https://www.fastprep.io/low-level-design/parameterized-configuration-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/parameterized-configuration-library)|๐Ÿ†• Sep 18, 2026| |**Amazon**|[Minimum Stick Connection Cost](https://www.fastprep.io/problems/amazon-minimum-stick-connection-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-stick-connection-cost)|๐Ÿ†• Sep 18, 2026| |**Capital One**|[Format a Newspaper Page](https://www.fastprep.io/problems/capital-one-format-newspaper-page)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-format-newspaper-page)|๐Ÿ†• Sep 18, 2026| |**Capital One**|[Compare Counts Around Pivot](https://www.fastprep.io/problems/capital-one-compare-counts-around-pivot)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-compare-counts-around-pivot)|๐Ÿ†• Sep 18, 2026| |**Capital One**|[Reconstruct Landmark Journey](https://www.fastprep.io/problems/capital-one-reconstruct-landmark-journey)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-reconstruct-landmark-journey)|๐Ÿ†• Sep 18, 2026| |**Capital One**|[Linear Warehouse Drone Delivery](https://www.fastprep.io/problems/capital-one-linear-warehouse-drone-delivery)|Coding|[![Practice][p]](https://www.fastprep.io/problems/capital-one-linear-warehouse-drone-delivery)|๐Ÿ†• Sep 18, 2026| |**Two Sigma**|[Sewer Drainage Partition](https://www.fastprep.io/problems/twosigma-sewer-drainage-partition)|Coding|[![Practice][p]](https://www.fastprep.io/problems/twosigma-sewer-drainage-partition)|๐Ÿ†• Sep 18, 2026| |**Uber**|[Large Structured Data Filesystem](https://www.fastprep.io/system-design/large-structured-data-filesystem)|System design|[![Practice][p]](https://www.fastprep.io/system-design/large-structured-data-filesystem)|๐Ÿ†• Sep 18, 2026| |**Intuit**|[Longest Uninterrupted Work Block](https://www.fastprep.io/problems/intuit-longest-uninterrupted-work-block)|Coding|[![Practice][p]](https://www.fastprep.io/problems/intuit-longest-uninterrupted-work-block)|๐Ÿ†• Sep 18, 2026| |**Uber**|[Shortest Increasing Path to a Target](https://www.fastprep.io/problems/uber-shortest-increasing-target-path)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-shortest-increasing-target-path)|๐Ÿ†• Sep 18, 2026| |**Uber**|[Zigzag Board Adjacent Swaps](https://www.fastprep.io/problems/uber-zigzag-board-adjacent-swaps)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-zigzag-board-adjacent-swaps)|๐Ÿ†• Sep 18, 2026| |**IBM**|[Customer Resource Usage Analysis](https://www.fastprep.io/problems/ibm-customer-resource-usage-analysis)|SQL|[![Practice][p]](https://www.fastprep.io/problems/ibm-customer-resource-usage-analysis)|๐Ÿ†• Sep 18, 2026| |**IBM**|[Tool Changer](https://www.fastprep.io/problems/ibm-tool-changer)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-tool-changer)|๐Ÿ†• Sep 18, 2026| |**Amazon**|[Course Order and Cycle](https://www.fastprep.io/problems/amazon-course-order-and-cycle)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-course-order-and-cycle)|๐Ÿ†• Sep 17, 2026| |**Unattributed**|[Filter and Batch Concurrent Logs](https://www.fastprep.io/project-coding/concurrent-log-filter-batcher)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/concurrent-log-filter-batcher)|๐Ÿ†• Sep 17, 2026| |**Citadel**|[Top Ten Trades by Notional Value](https://www.fastprep.io/problems/citadel-top-ten-trades-by-notional)|Coding|[![Practice][p]](https://www.fastprep.io/problems/citadel-top-ten-trades-by-notional)|๐Ÿ†• Sep 17, 2026| |**Citadel**|[Reconcile Unmatched Trades with Timestamp Tolerance](https://www.fastprep.io/problems/citadel-reconcile-unmatched-trades)|Coding|[![Practice][p]](https://www.fastprep.io/problems/citadel-reconcile-unmatched-trades)|๐Ÿ†• Sep 17, 2026| |**Uber**|[First Unique IP Hitting the Server](https://www.fastprep.io/problems/uber-first-unique-ip-hitting-server)|Coding|[![Practice][p]](https://www.fastprep.io/problems/uber-first-unique-ip-hitting-server)|๐Ÿ†• Sep 17, 2026| |**Microsoft**|[Design Distributed LLM Embedding and Output Sharding](https://www.fastprep.io/system-design/distributed-llm-embedding-and-output-sharding)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-llm-embedding-and-output-sharding)|๐Ÿ†• Sep 17, 2026| |**Susquehanna International Group (SIG)**|[Leftmost Memory Block Allocator](https://www.fastprep.io/problems/susquehanna-leftmost-memory-block-allocator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-leftmost-memory-block-allocator)|๐Ÿ†• Sep 17, 2026| |**Susquehanna International Group (SIG)**|[Sort Matrix Borders](https://www.fastprep.io/problems/susquehanna-sort-matrix-borders)|Coding|[![Practice][p]](https://www.fastprep.io/problems/susquehanna-sort-matrix-borders)|๐Ÿ†• Sep 17, 2026| |**Fox Corporation**|[Design a Model-Version-Aware Derived-Data Cache](https://www.fastprep.io/system-design/model-version-aware-derived-cache)|System design|[![Practice][p]](https://www.fastprep.io/system-design/model-version-aware-derived-cache)|๐Ÿ†• Sep 17, 2026| |**Oracle**|[Design Data-Loss Prevention and Recovery for a Distributed Store](https://www.fastprep.io/system-design/distributed-data-loss-prevention-and-recovery)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-data-loss-prevention-and-recovery)|๐Ÿ†• Sep 17, 2026| |**Oracle**|[Design Stable API and Database Pagination](https://www.fastprep.io/system-design/stable-api-database-pagination-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/stable-api-database-pagination-service)|๐Ÿ†• Sep 17, 2026| |**Kotak Mahindra Bank**|[Design a Showroom Vehicle Booking and Loan Workflow](https://www.fastprep.io/low-level-design/showroom-vehicle-booking-loan-workflow)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/showroom-vehicle-booking-loan-workflow)|๐Ÿ†• Sep 17, 2026| |**Fox Corporation**|[Design and Implement a Structured Content Query Library](https://www.fastprep.io/low-level-design/streaming-content-query-library)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/streaming-content-query-library)|๐Ÿ†• Sep 17, 2026| |**LinkedIn**|[Binary Tree Zigzag Level Order Traversal](https://www.fastprep.io/problems/linkedin-binary-tree-zigzag-level-order)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-binary-tree-zigzag-level-order)|๐Ÿ†• Sep 17, 2026| |**LinkedIn**|[LRU Cache with Hit and Miss Counters](https://www.fastprep.io/problems/linkedin-lru-cache-hit-miss-counters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-lru-cache-hit-miss-counters)|๐Ÿ†• Sep 17, 2026| |**LinkedIn**|[Max Points on a Line](https://www.fastprep.io/problems/linkedin-max-points-on-a-line)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-max-points-on-a-line)|๐Ÿ†• Sep 17, 2026| |**LinkedIn**|[Maximum Depth of Binary Tree](https://www.fastprep.io/problems/linkedin-maximum-depth-of-binary-tree)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-maximum-depth-of-binary-tree)|๐Ÿ†• Sep 17, 2026| |**Applied Intuition**|[Compilation Order with Topological Sort](https://www.fastprep.io/problems/applied-intuition-compilation-order-topological-sort)|Coding|[![Practice][p]](https://www.fastprep.io/problems/applied-intuition-compilation-order-topological-sort)|๐Ÿ†• Sep 17, 2026| |**LinkedIn**|[Minimum Window Substring](https://www.fastprep.io/problems/linkedin-minimum-window-substring)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-minimum-window-substring)|๐Ÿ†• Sep 17, 2026| |**Meta**|[Values Exclusive to the Current User](https://www.fastprep.io/problems/meta-exclusive-user-dictionary-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-exclusive-user-dictionary-values)|๐Ÿ†• Sep 17, 2026| |**Plaid**|[Validate and Resolve Evaluation Chains](https://www.fastprep.io/problems/plaid-evaluation-chain-validity)|Coding|[![Practice][p]](https://www.fastprep.io/problems/plaid-evaluation-chain-validity)|๐Ÿ†• Sep 17, 2026| |**Plaid**|[Total Pipeline Completion Time](https://www.fastprep.io/problems/plaid-total-pipeline-completion-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/plaid-total-pipeline-completion-time)|๐Ÿ†• Sep 17, 2026| |**Snowflake**|[Minimum Bus Fleet Across Stations](https://www.fastprep.io/problems/snowflake-minimum-station-bus-fleet)|Coding|[![Practice][p]](https://www.fastprep.io/problems/snowflake-minimum-station-bus-fleet)|๐Ÿ†• Sep 17, 2026| |**SpaceX**|[Timestamped Telemetry Stream Differences](https://www.fastprep.io/problems/spacex-timestamped-telemetry-differences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/spacex-timestamped-telemetry-differences)|๐Ÿ†• Sep 17, 2026| |**Together AI**|[Time-Indexed Key-Value Store](https://www.fastprep.io/problems/together-ai-time-indexed-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/together-ai-time-indexed-key-value-store)|๐Ÿ†• Sep 17, 2026| |**Waymo**|[Cyclic Fuel Command Simulation](https://www.fastprep.io/problems/waymo-cyclic-fuel-command-simulation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/waymo-cyclic-fuel-command-simulation)|๐Ÿ†• Sep 17, 2026| |**Zip**|[Maximum Survival Time in a Graph Pursuit](https://www.fastprep.io/problems/zip-graph-pursuit-survival-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/zip-graph-pursuit-survival-time)|๐Ÿ†• Sep 17, 2026| |**Google**|[First and Last Target Position in a Mountain Array](https://www.fastprep.io/problems/google-mountain-array-target-range)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-mountain-array-target-range)|๐Ÿ†• Sep 17, 2026| |**Blinkit / Karat**|[Design a Food Delivery Order Tracking System](https://www.fastprep.io/system-design/food-delivery-order-tracking-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/food-delivery-order-tracking-system)|๐Ÿ†• Sep 17, 2026| |**Amazon**|[Latest Stock State Across Distribution Centers](https://www.fastprep.io/system-design/distribution-center-stock-state)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distribution-center-stock-state)|๐Ÿ†• Sep 17, 2026| |**Amazon**|[Hierarchical Document Search](https://www.fastprep.io/problems/amazon-hierarchical-document-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-hierarchical-document-search)|๐Ÿ†• Sep 17, 2026| |**Amazon**|[Lazy Merge of Sorted Event Streams](https://www.fastprep.io/problems/amazon-lazy-event-stream-merge)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-lazy-event-stream-merge)|๐Ÿ†• Sep 17, 2026| |**Zip**|[Cache Ticket Alerts for Approval](https://www.fastprep.io/project-coding/zip-ticket-alert-approval-cache)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/zip-ticket-alert-approval-cache)|๐Ÿ†• Sep 16, 2026| |**IBM**|[Repair Event Pre-Save Validation](https://www.fastprep.io/project-coding/ibm-event-presave-validation)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/ibm-event-presave-validation)|๐Ÿ†• Sep 16, 2026| |**Tesla**|[Swap Even and Odd Bits](https://www.fastprep.io/problems/tesla-swap-even-and-odd-bits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tesla-swap-even-and-odd-bits)|๐Ÿ†• Sep 16, 2026| |**Anthropic**|[Design a Communication-Efficient Distributed Median Aggregation](https://www.fastprep.io/system-design/distributed-median-aggregation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-median-aggregation)|๐Ÿ†• Sep 16, 2026| |**Anthropic**|[Design a Communication-Efficient Distributed Mode Aggregation](https://www.fastprep.io/system-design/distributed-mode-aggregation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/distributed-mode-aggregation)|๐Ÿ†• Sep 16, 2026| |**DoorDash**|[Build a Refund DAG with Local HTTP Services](https://www.fastprep.io/project-coding/doordash-refund-dag-local-services)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/doordash-refund-dag-local-services)|๐Ÿ†• Sep 16, 2026| |**DoorDash**|[Debug Two Routing Strategies](https://www.fastprep.io/project-coding/doordash-routing-strategy-debugger)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/doordash-routing-strategy-debugger)|๐Ÿ†• Sep 16, 2026| |**Gatik AI**|[Design a Configurable Point-Cloud Transformation Pipeline](https://www.fastprep.io/low-level-design/configurable-point-cloud-transformation-pipeline)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/configurable-point-cloud-transformation-pipeline)|๐Ÿ†• Sep 16, 2026| |**Airbnb**|[Design a Booking-Lifecycle Metrics Model](https://www.fastprep.io/system-design/booking-lifecycle-metrics-model)|System design|[![Practice][p]](https://www.fastprep.io/system-design/booking-lifecycle-metrics-model)|๐Ÿ†• Sep 16, 2026| |**Amazon**|[Design a Music Click-Through Prediction Platform](https://www.fastprep.io/system-design/music-click-through-rate-prediction-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/music-click-through-rate-prediction-platform)|๐Ÿ†• Sep 16, 2026| |**Latent**|[Design a Prior-Authorization Worklist and Digest](https://www.fastprep.io/system-design/prior-authorization-worklist-and-digest)|System design|[![Practice][p]](https://www.fastprep.io/system-design/prior-authorization-worklist-and-digest)|๐Ÿ†• Sep 16, 2026| |**ByteDance**|[Design Multi-Tenant Agent Quota Accounting](https://www.fastprep.io/system-design/multi-tenant-agent-quota-accounting)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multi-tenant-agent-quota-accounting)|๐Ÿ†• Sep 16, 2026| |**LinkedIn**|[Malicious IP Traffic Filtering Platform](https://www.fastprep.io/system-design/malicious-ip-traffic-filtering-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/malicious-ip-traffic-filtering-platform)|๐Ÿ†• Sep 16, 2026| |**IBM**|[Minimum Additions to Make a Valid ABC String](https://www.fastprep.io/problems/ibm-minimum-additions-to-make-valid-abc-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/ibm-minimum-additions-to-make-valid-abc-string)|๐Ÿ†• Sep 16, 2026| |**IBM**|[Social Network Relationship Statistics](https://www.fastprep.io/problems/ibm-social-network-relationship-statistics)|SQL|[![Practice][p]](https://www.fastprep.io/problems/ibm-social-network-relationship-statistics)|๐Ÿ†• Sep 16, 2026| |**Salesforce**|[Design Coffee-Shop Ordering and Fulfillment](https://www.fastprep.io/system-design/coffee-shop-ordering-and-fulfillment)|System design|[![Practice][p]](https://www.fastprep.io/system-design/coffee-shop-ordering-and-fulfillment)|๐Ÿ†• Sep 16, 2026| |**Amazon / Goldman Sachs / Salesforce / Harness**|[Design an In-Memory Job Scheduler](https://www.fastprep.io/low-level-design/in-memory-job-scheduler)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-job-scheduler)|๐Ÿ†• Sep 16, 2026| |**Netflix / Amazon**|[Design a Parking Lot with Flexible Fees](https://www.fastprep.io/low-level-design/parking-lot-with-flexible-fees)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/parking-lot-with-flexible-fees)|๐Ÿ†• Sep 16, 2026| |**Amazon**|[Design a Continental Temperature Heatmap](https://www.fastprep.io/system-design/continental-temperature-heatmap)|System design|[![Practice][p]](https://www.fastprep.io/system-design/continental-temperature-heatmap)|๐Ÿ†• Sep 16, 2026| |**DocuSign**|[Design a Live Location Tracking Service](https://www.fastprep.io/system-design/live-location-tracking-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/live-location-tracking-service)|๐Ÿ†• Sep 16, 2026| |**Rubrik**|[Design Cross-Region Versioned Map Reconciliation](https://www.fastprep.io/system-design/cross-region-versioned-map-reconciliation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/cross-region-versioned-map-reconciliation)|๐Ÿ†• Sep 16, 2026| |**Harness**|[Design Rolling Top-N Movie Recommendations](https://www.fastprep.io/system-design/rolling-top-n-movie-views)|System design|[![Practice][p]](https://www.fastprep.io/system-design/rolling-top-n-movie-views)|๐Ÿ†• Sep 16, 2026| |**Rubrik**|[Design a Thread-Safe One-Dimensional Parking Lot](https://www.fastprep.io/low-level-design/thread-safe-linear-parking-lot)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/thread-safe-linear-parking-lot)|๐Ÿ†• Sep 16, 2026| |**Walmart**|[Repair Movie Watchlist Synchronization](https://www.fastprep.io/project-coding/walmart-repair-movie-watchlist)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/walmart-repair-movie-watchlist)|๐Ÿ†• Sep 16, 2026| |**Salesforce**|[LFU Cache](https://www.fastprep.io/problems/salesforce-lfu-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-lfu-cache)|๐Ÿ†• Sep 16, 2026| |**DoorDash**|[Random Dasher Set Operations](https://www.fastprep.io/problems/doordash-random-dasher-set)|Coding|[![Practice][p]](https://www.fastprep.io/problems/doordash-random-dasher-set)|๐Ÿ†• Sep 16, 2026| |**Salesforce**|[Run-Length String Compression](https://www.fastprep.io/problems/salesforce-run-length-string-compression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-run-length-string-compression)|๐Ÿ†• Sep 16, 2026| |**Anthropic**|[Profiling Events from Consecutive Stack Samples](https://www.fastprep.io/problems/anthropic-consecutive-stack-sample-trace-events)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-consecutive-stack-sample-trace-events)|๐Ÿ†• Sep 16, 2026| |**Pinterest**|[Time-Ordered Elevator Dispatch](https://www.fastprep.io/problems/pinterest-time-ordered-elevator-dispatch)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-time-ordered-elevator-dispatch)|๐Ÿ†• Sep 16, 2026| |**Agoda**|[Count Values Appearing Exactly Once](https://www.fastprep.io/problems/agoda-count-values-appearing-once)|Coding|[![Practice][p]](https://www.fastprep.io/problems/agoda-count-values-appearing-once)|๐Ÿ†• Sep 16, 2026| |**Agoda**|[Longest All-Present Attendance Streak](https://www.fastprep.io/problems/agoda-longest-all-present-streak)|Coding|[![Practice][p]](https://www.fastprep.io/problems/agoda-longest-all-present-streak)|๐Ÿ†• Sep 16, 2026| |**Airbnb**|[Median Home Price by City](https://www.fastprep.io/problems/airbnb-city-price-medians)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-city-price-medians)|๐Ÿ†• Sep 16, 2026| |**Airbnb**|[Superhost Eligibility](https://www.fastprep.io/problems/airbnb-superhost-eligibility)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airbnb-superhost-eligibility)|๐Ÿ†• Sep 16, 2026| |**Anthropic**|[Confirmed Profiling Events with First-Observed Starts](https://www.fastprep.io/problems/anthropic-confirmed-profiling-events-first-observed-starts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-confirmed-profiling-events-first-observed-starts)|๐Ÿ†• Sep 16, 2026| |**Anthropic**|[Convert Stack Samples to Trace Events](https://www.fastprep.io/problems/anthropic-convert-stack-samples-to-trace-events)|Coding|[![Practice][p]](https://www.fastprep.io/problems/anthropic-convert-stack-samples-to-trace-events)|๐Ÿ†• Sep 16, 2026| |**Apple**|[Canonical N-Ary Tree Codec](https://www.fastprep.io/problems/apple-canonical-nary-tree-codec)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-canonical-nary-tree-codec)|๐Ÿ†• Sep 16, 2026| |**Google**|[Trim a Binary Search Tree to a Range](https://www.fastprep.io/problems/google-trim-binary-search-tree-range)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-trim-binary-search-tree-range)|๐Ÿ†• Sep 16, 2026| |**LinkedIn**|[Users with a Short Sign-In Session](https://www.fastprep.io/problems/linkedin-users-with-short-session)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-users-with-short-session)|๐Ÿ†• Sep 16, 2026| |**Meta**|[First Bad Version in a Monotone Array](https://www.fastprep.io/problems/meta-first-bad-version-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-first-bad-version-array)|๐Ÿ†• Sep 16, 2026| |**Meta**|[Parenthesized String Calculator](https://www.fastprep.io/problems/meta-parenthesized-string-calculator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-parenthesized-string-calculator)|๐Ÿ†• Sep 16, 2026| |**Netflix**|[Custom Record and Free-Form Field Parser](https://www.fastprep.io/problems/netflix-custom-record-freeform-parser)|Coding|[![Practice][p]](https://www.fastprep.io/problems/netflix-custom-record-freeform-parser)|๐Ÿ†• Sep 16, 2026| |**Otter.ai**|[Versioned Key-Value Store with Commits](https://www.fastprep.io/problems/otter-ai-versioned-key-value-commits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/otter-ai-versioned-key-value-commits)|๐Ÿ†• Sep 16, 2026| |**Pinterest**|[Shortest Sequence of Source Subsequences](https://www.fastprep.io/problems/pinterest-shortest-source-subsequences)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-shortest-source-subsequences)|๐Ÿ†• Sep 16, 2026| |**Robinhood**|[Friendship and Balance Tracker](https://www.fastprep.io/problems/robinhood-friendship-balance-tracker)|Coding|[![Practice][p]](https://www.fastprep.io/problems/robinhood-friendship-balance-tracker)|๐Ÿ†• Sep 16, 2026| |**Robinhood**|[Service Dependency Load Factors](https://www.fastprep.io/problems/robinhood-service-dependency-load-factors)|Coding|[![Practice][p]](https://www.fastprep.io/problems/robinhood-service-dependency-load-factors)|๐Ÿ†• Sep 16, 2026| |**Salesforce**|[Flatten Nested Map Paths with a Stack](https://www.fastprep.io/problems/salesforce-flatten-nested-map-paths)|Coding|[![Practice][p]](https://www.fastprep.io/problems/salesforce-flatten-nested-map-paths)|๐Ÿ†• Sep 16, 2026| |**Siemens**|[Padded Vector Batch Pipeline](https://www.fastprep.io/problems/siemens-padded-vector-batch-pipeline)|Coding|[![Practice][p]](https://www.fastprep.io/problems/siemens-padded-vector-batch-pipeline)|๐Ÿ†• Sep 16, 2026| |**Squarepoint Capital**|[Mutable Record Store with Error Results](https://www.fastprep.io/problems/squarepoint-mutable-record-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/squarepoint-mutable-record-store)|๐Ÿ†• Sep 16, 2026| |**Stripe**|[Monthly Latest-Balance Reconciliation](https://www.fastprep.io/problems/stripe-monthly-latest-balance-reconciliation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/stripe-monthly-latest-balance-reconciliation)|๐Ÿ†• Sep 16, 2026| |**Tesla**|[Reduce-Based Map and Filter Pipeline](https://www.fastprep.io/problems/tesla-reduce-map-filter-pipeline)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tesla-reduce-map-filter-pipeline)|๐Ÿ†• Sep 16, 2026| |**Walmart**|[Maximum Points by Deleting Elements](https://www.fastprep.io/problems/walmart-maximum-points-by-deleting-elements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/walmart-maximum-points-by-deleting-elements)|๐Ÿ†• Sep 16, 2026| |**Amazon**|[Grid Reachability with a Forbidden Turn](https://www.fastprep.io/problems/amazon-grid-reachability-forbidden-turn)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-grid-reachability-forbidden-turn)|๐Ÿ†• Sep 16, 2026| |**Goldman Sachs**|[Repair the Held-Ticket Confirmation Lifecycle](https://www.fastprep.io/project-coding/goldman-sachs-held-ticket-confirmation)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/goldman-sachs-held-ticket-confirmation)|๐Ÿ†• Sep 16, 2026| |**Rippling**|[Common Ancestors in a Directed Acyclic Graph](https://www.fastprep.io/problems/rippling-common-ancestors-dag)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-common-ancestors-dag)|๐Ÿ†• Sep 15, 2026| |**Mercor**|[Repair a Concurrent Read-Through Cache](https://www.fastprep.io/project-coding/mercor-concurrent-read-through-cache)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/mercor-concurrent-read-through-cache)|๐Ÿ†• Sep 15, 2026| |**Pinterest**|[Design Merchant Product Catalog Ingestion](https://www.fastprep.io/system-design/merchant-product-catalog-ingestion)|System design|[![Practice][p]](https://www.fastprep.io/system-design/merchant-product-catalog-ingestion)|๐Ÿ†• Sep 15, 2026| |**Hadrian / DigitalOcean**|[Design a Live Relational Database Migration](https://www.fastprep.io/system-design/live-relational-database-migration)|System design|[![Practice][p]](https://www.fastprep.io/system-design/live-relational-database-migration)|๐Ÿ†• Sep 15, 2026| |**Meta**|[Design a Social Game Score Leaderboard](https://www.fastprep.io/system-design/social-game-score-leaderboard)|System design|[![Practice][p]](https://www.fastprep.io/system-design/social-game-score-leaderboard)|๐Ÿ†• Sep 15, 2026| |**Amazon**|[Repair Django Ticket Creation and Replies](https://www.fastprep.io/project-coding/amazon-django-ticket-replies)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/amazon-django-ticket-replies)|๐Ÿ†• Sep 15, 2026| |**Concentric AI**|[Design an Institute Attendance Management Platform](https://www.fastprep.io/system-design/institute-attendance-management-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/institute-attendance-management-platform)|๐Ÿ†• Sep 15, 2026| |**Hudson River Trading**|[Tiered Expiring Item Store](https://www.fastprep.io/problems/hrt-tiered-expiring-item-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-tiered-expiring-item-store)|๐Ÿ†• Sep 15, 2026| |**Vercel**|[Recent Metrics by Name and Tags](https://www.fastprep.io/problems/vercel-recent-metrics-by-name-and-tags)|Coding|[![Practice][p]](https://www.fastprep.io/problems/vercel-recent-metrics-by-name-and-tags)|๐Ÿ†• Sep 15, 2026| |**Pinterest**|[Nearest Eligible Elevator](https://www.fastprep.io/problems/pinterest-nearest-eligible-elevator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pinterest-nearest-eligible-elevator)|๐Ÿ†• Sep 15, 2026| |**DigitalOcean**|[Maximum Value from Circular Houses](https://www.fastprep.io/problems/digitalocean-house-robber-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/digitalocean-house-robber-ii)|๐Ÿ†• Sep 15, 2026| |**DigitalOcean**|[Longest Repeating Character Replacement](https://www.fastprep.io/problems/digitalocean-longest-repeating-character-replacement)|Coding|[![Practice][p]](https://www.fastprep.io/problems/digitalocean-longest-repeating-character-replacement)|๐Ÿ†• Sep 15, 2026| |**Meta**|[Mutual-Friend Recommendations](https://www.fastprep.io/problems/meta-mutual-friend-recommendations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-mutual-friend-recommendations)|๐Ÿ†• Sep 15, 2026| |**Meta**|[Partition a Card Deck into Fifteens](https://www.fastprep.io/problems/meta-partition-deck-into-fifteens)|Coding|[![Practice][p]](https://www.fastprep.io/problems/meta-partition-deck-into-fifteens)|๐Ÿ†• Sep 15, 2026| |**OpenAI**|[Dependency-Aware Agent Task Scheduler](https://www.fastprep.io/problems/openai-dependency-aware-agent-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/openai-dependency-aware-agent-scheduler)|๐Ÿ†• Sep 15, 2026| |**Robinhood**|[Transitive Employee Referral Counts](https://www.fastprep.io/problems/robinhood-transitive-employee-referral-counts)|Coding|[![Practice][p]](https://www.fastprep.io/problems/robinhood-transitive-employee-referral-counts)|๐Ÿ†• Sep 15, 2026| |**Google**|[Detect Duplicate Trace IDs in a Linked List](https://www.fastprep.io/problems/google-duplicate-trace-ids-linked-list)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-duplicate-trace-ids-linked-list)|๐Ÿ†• Sep 15, 2026| |**Amazon**|[Design Usage Billing for One Account](https://www.fastprep.io/low-level-design/single-account-usage-billing)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/single-account-usage-billing)|Sep 14, 2026| |**Amazon**|[Root-to-Leaf Paths with a Target Sum](https://www.fastprep.io/problems/amazon-root-to-leaf-target-sum-paths)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-root-to-leaf-target-sum-paths)|Sep 14, 2026| |**Amazon**|[First Non-Repeating Character](https://www.fastprep.io/problems/amazon-first-non-repeating-character)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-first-non-repeating-character)|Sep 14, 2026| |**Unattributed**|[Design and Implement a Concurrency-Safe Wallet](https://www.fastprep.io/low-level-design/concurrency-safe-wallet)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/concurrency-safe-wallet)|Sep 14, 2026| |**Akuna Capital**|[Count Server Replacements](https://www.fastprep.io/problems/akuna-count-server-replacements)|Coding|[![Practice][p]](https://www.fastprep.io/problems/akuna-count-server-replacements)|Sep 14, 2026| |**Akuna Capital**|[Maximum Remaining Drone Power](https://www.fastprep.io/problems/akuna-maximum-remaining-drone-power)|Coding|[![Practice][p]](https://www.fastprep.io/problems/akuna-maximum-remaining-drone-power)|Sep 14, 2026| |**Two Sigma**|[Online No-Intercept Linear Regression](https://www.fastprep.io/problems/two-sigma-online-no-intercept-linear-regression)|Coding|[![Practice][p]](https://www.fastprep.io/problems/two-sigma-online-no-intercept-linear-regression)|Sep 14, 2026| |**Two Sigma**|[Linear Interpolator](https://www.fastprep.io/problems/two-sigma-linear-interpolator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/two-sigma-linear-interpolator)|Sep 14, 2026| |**Two Sigma**|[Daily Temperature By Town](https://www.fastprep.io/problems/two-sigma-daily-temperature-by-town)|SQL|[![Practice][p]](https://www.fastprep.io/problems/two-sigma-daily-temperature-by-town)|Sep 14, 2026| |**Akuna Capital**|[Vowel Substring Game](https://www.fastprep.io/problems/akuna-vowel-substring-game)|Coding|[![Practice][p]](https://www.fastprep.io/problems/akuna-vowel-substring-game)|Sep 14, 2026| |**Rippling**|[Filter, Sort, and Deduplicate Scheduled Tasks](https://www.fastprep.io/problems/rippling-filter-sort-and-deduplicate-tasks)|Coding|[![Practice][p]](https://www.fastprep.io/problems/rippling-filter-sort-and-deduplicate-tasks)|Sep 14, 2026| |**Goldman Sachs**|[Design a Pastebin Text Sharing Service](https://www.fastprep.io/system-design/pastebin-text-sharing)|System design|[![Practice][p]](https://www.fastprep.io/system-design/pastebin-text-sharing)|Sep 14, 2026| |**Airwallex**|[Design an Authoritative Grid Chase Game](https://www.fastprep.io/system-design/authoritative-grid-chase-game)|System design|[![Practice][p]](https://www.fastprep.io/system-design/authoritative-grid-chase-game)|Sep 14, 2026| |**Goldman Sachs**|[Staircase Search In A Sorted Matrix](https://www.fastprep.io/problems/goldman-sachs-staircase-search)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-staircase-search)|Sep 14, 2026| |**Goldman Sachs**|[Insert, Delete, And Get Random In Constant Time](https://www.fastprep.io/problems/goldman-sachs-insert-delete-getrandom-o1)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-insert-delete-getrandom-o1)|Sep 14, 2026| |**Goldman Sachs**|[Dungeon Health](https://www.fastprep.io/problems/goldman-sachs-dungeon-health)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-dungeon-health)|Sep 14, 2026| |**Goldman Sachs**|[Least Recently Used Cache](https://www.fastprep.io/problems/goldman-sachs-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-lru-cache)|Sep 14, 2026| |**Vanta**|[Implement uniq: Unique Lines](https://www.fastprep.io/problems/vanta-unique-lines-command)|Coding|[![Practice][p]](https://www.fastprep.io/problems/vanta-unique-lines-command)|Sep 14, 2026| |**Airwallex**|[Paginated K-Way Unique Merge](https://www.fastprep.io/problems/airwallex-paginated-k-way-unique-merge)|Coding|[![Practice][p]](https://www.fastprep.io/problems/airwallex-paginated-k-way-unique-merge)|Sep 14, 2026| |**Applied Intuition**|[Merge Overlapping Closed Intervals](https://www.fastprep.io/problems/applied-intuition-merge-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/applied-intuition-merge-intervals)|Sep 14, 2026| |**LinkedIn**|[Restricted Decimal Number Validator](https://www.fastprep.io/problems/linkedin-restricted-decimal-number-validator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-restricted-decimal-number-validator)|Sep 14, 2026| |**LinkedIn**|[Second Minimum in a Tournament Tree](https://www.fastprep.io/problems/linkedin-tournament-tree-second-minimum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-tournament-tree-second-minimum)|Sep 14, 2026| |**The Walt Disney Company**|[Resizable Array-Backed Integer Set](https://www.fastprep.io/problems/the-walt-disney-company-resizable-array-set)|Coding|[![Practice][p]](https://www.fastprep.io/problems/the-walt-disney-company-resizable-array-set)|Sep 14, 2026| |**Google**|[Find the Duplicate Number Without Modifying the Array](https://www.fastprep.io/problems/google-find-the-duplicate-number)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-find-the-duplicate-number)|Sep 14, 2026| |**Google**|[Set Matrix Zeroes](https://www.fastprep.io/problems/google-set-matrix-zeroes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-set-matrix-zeroes)|Sep 14, 2026| |**Citadel**|[Exchange BBO and Market-Wide NBBO](https://www.fastprep.io/problems/citadel-exchange-bbo-nbbo-order-book)|Coding|[![Practice][p]](https://www.fastprep.io/problems/citadel-exchange-bbo-nbbo-order-book)|Sep 13, 2026| |**Google**|[Determine Whether Two Horses Are Genetically Related](https://www.fastprep.io/problems/google-horse-genetic-relatedness)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-horse-genetic-relatedness)|Sep 13, 2026| |**JP Morgan Chase**|[Spark Cluster Sizing for a 100 GB Workload](https://www.fastprep.io/system-design/spark-cluster-sizing-100-gb-workload)|System design|[![Practice][p]](https://www.fastprep.io/system-design/spark-cluster-sizing-100-gb-workload)|Sep 13, 2026| |**Tekion / JP Morgan Chase**|[Design a Resilient Multi-Table ETL Pipeline](https://www.fastprep.io/system-design/resilient-multitable-etl-reconciliation)|System design|[![Practice][p]](https://www.fastprep.io/system-design/resilient-multitable-etl-reconciliation)|Sep 13, 2026| |**JPMorgan Chase**|[Employees Above Average Salary](https://www.fastprep.io/problems/jpmorgan-employees-above-average-salary)|SQL|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-employees-above-average-salary)|Sep 13, 2026| |**JPMorgan Chase**|[Highest-Earning Employees By Department](https://www.fastprep.io/problems/jpmorgan-highest-earner-per-department)|SQL|[![Practice][p]](https://www.fastprep.io/problems/jpmorgan-highest-earner-per-department)|Sep 13, 2026| |**Juspay**|[Sum Dynamic Weighted Tree Distances](https://www.fastprep.io/problems/juspay-dynamic-weighted-tree-distance-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/juspay-dynamic-weighted-tree-distance-sum)|Sep 13, 2026| |**Juspay**|[Minimum of Fixed-Window Maxima](https://www.fastprep.io/problems/juspay-minimum-of-window-maxima)|Coding|[![Practice][p]](https://www.fastprep.io/problems/juspay-minimum-of-window-maxima)|Sep 13, 2026| |**Lenskart**|[Most Recent Active User Per Department](https://www.fastprep.io/problems/lenskart-most-recent-active-user-per-department)|SQL|[![Practice][p]](https://www.fastprep.io/problems/lenskart-most-recent-active-user-per-department)|Sep 13, 2026| |**Lenskart**|[Test Execution Success Rate](https://www.fastprep.io/problems/lenskart-test-execution-success-rate)|SQL|[![Practice][p]](https://www.fastprep.io/problems/lenskart-test-execution-success-rate)|Sep 13, 2026| |**Lenskart**|[First Duplicate Transaction Within Ten Minutes](https://www.fastprep.io/problems/lenskart-first-duplicate-transaction-within-ten-minutes)|SQL|[![Practice][p]](https://www.fastprep.io/problems/lenskart-first-duplicate-transaction-within-ten-minutes)|Sep 13, 2026| |**Amazon**|[Design a Return Drop-Store Booking System](https://www.fastprep.io/low-level-design/return-drop-store-booking)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/return-drop-store-booking)|Sep 13, 2026| |**Amazon**|[Design a Playlist Source Mixer](https://www.fastprep.io/low-level-design/playlist-source-mixer)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/playlist-source-mixer)|Sep 13, 2026| |**Amazon / Atlassian / Wayfair**|[Global Music Streaming Platform](https://www.fastprep.io/system-design/global-music-streaming-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/global-music-streaming-platform)|Sep 13, 2026| |**Amazon**|[Design an Amazon Locker System](https://www.fastprep.io/system-design/amazon-locker-system)|System design|[![Practice][p]](https://www.fastprep.io/system-design/amazon-locker-system)|Sep 13, 2026| |**Amazon**|[Design a Scalable Artifact Repository](https://www.fastprep.io/system-design/scalable-artifact-repository)|System design|[![Practice][p]](https://www.fastprep.io/system-design/scalable-artifact-repository)|Sep 13, 2026| |**Amazon**|[Design Device Backup and Restore](https://www.fastprep.io/system-design/device-backup-and-restore)|System design|[![Practice][p]](https://www.fastprep.io/system-design/device-backup-and-restore)|Sep 13, 2026| |**Amazon**|[Design an Extensible Shipping Cost Calculator](https://www.fastprep.io/low-level-design/extensible-shipping-cost-calculator)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/extensible-shipping-cost-calculator)|Sep 13, 2026| |**Google**|[Split and Sort Array](https://www.fastprep.io/problems/google-split-and-sort)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-split-and-sort)|Sep 13, 2026| |**Google**|[Minimum Number Of Moves to Obtain](https://www.fastprep.io/problems/google-minimum-number-of-moves-to-obtain)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-minimum-number-of-moves-to-obtain)|Sep 13, 2026| |**Amazon**|[Count Stepping Numbers In Range](https://www.fastprep.io/problems/amazon-count-stepping-numbers-in-range)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-count-stepping-numbers-in-range)|Sep 13, 2026| |**Amazon**|[Container With Most Water](https://www.fastprep.io/problems/amazon-container-with-most-water)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-container-with-most-water)|Sep 13, 2026| |**Amazon**|[Cheapest Flights Within K Stops](https://www.fastprep.io/problems/amazon-cheapest-flights-within-k-stops)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-cheapest-flights-within-k-stops)|Sep 13, 2026| |**Amazon**|[Find Median from Data Stream](https://www.fastprep.io/problems/amazon-find-median-from-data-stream)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-find-median-from-data-stream)|Sep 13, 2026| |**Amazon**|[Basic Calculator](https://www.fastprep.io/problems/amazon-basic-calculator)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-basic-calculator)|Sep 13, 2026| |**Amazon**|[Distance Between Two Tree Nodes](https://www.fastprep.io/problems/amazon-distance-between-tree-nodes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-distance-between-tree-nodes)|Sep 13, 2026| |**Amazon**|[Longest Increasing Subsequence With Bounded Adjacent Difference](https://www.fastprep.io/problems/amazon-longest-increasing-subsequence-bounded-difference)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-longest-increasing-subsequence-bounded-difference)|Sep 13, 2026| |**Amazon**|[Task Scheduler](https://www.fastprep.io/problems/amazon-task-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-task-scheduler)|Sep 13, 2026| |**Amazon**|[Merge Intervals](https://www.fastprep.io/problems/amazon-merge-intervals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-merge-intervals)|Sep 13, 2026| |**Amazon**|[K Closest Elements in a Sorted Array](https://www.fastprep.io/problems/amazon-k-closest-elements-in-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-k-closest-elements-in-sorted-array)|Sep 13, 2026| |**Amazon**|[Fare Between Stops on a Train Route](https://www.fastprep.io/problems/amazon-train-route-fare)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-train-route-fare)|Sep 13, 2026| |**Amazon**|[Find the Safest Path in a Grid](https://www.fastprep.io/problems/amazon-find-safest-path-in-grid)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-find-safest-path-in-grid)|Sep 13, 2026| |**Amazon**|[Stack with Constant-Time Middle Queries](https://www.fastprep.io/problems/amazon-middle-stack-operations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-middle-stack-operations)|Sep 13, 2026| |**Amazon**|[Decode an Encoded String](https://www.fastprep.io/problems/amazon-decode-encoded-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-decode-encoded-string)|Sep 13, 2026| |**Amazon**|[Minimum Moves for Two Knights to Meet](https://www.fastprep.io/problems/amazon-two-knights-minimum-meeting-moves)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-two-knights-minimum-meeting-moves)|Sep 13, 2026| |**Amazon**|[Bit at an Index After Repeated Binary Expansion](https://www.fastprep.io/problems/amazon-indexed-bit-after-binary-expansion)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-indexed-bit-after-binary-expansion)|Sep 13, 2026| |**Amazon**|[Minimum Window Substring](https://www.fastprep.io/problems/amazon-minimum-window-substring)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimum-window-substring)|Sep 13, 2026| |**Amazon**|[Maximize Distance to the Closest Occupied Seat](https://www.fastprep.io/problems/amazon-maximize-distance-to-closest-person)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximize-distance-to-closest-person)|Sep 13, 2026| |**Amazon**|[Validate a Two-Color Chessboard](https://www.fastprep.io/problems/amazon-validate-two-color-chessboard)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-validate-two-color-chessboard)|Sep 13, 2026| |**Amazon**|[Longest Common Subsequence Length](https://www.fastprep.io/problems/amazon-longest-common-subsequence-length)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-longest-common-subsequence-length)|Sep 13, 2026| |**Amazon**|[Count Uni-Valued Subtrees](https://www.fastprep.io/problems/amazon-count-univalued-subtrees)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-count-univalued-subtrees)|Sep 13, 2026| |**Amazon**|[Next Palindromic Time](https://www.fastprep.io/problems/amazon-next-palindromic-time)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-next-palindromic-time)|Sep 13, 2026| |**Amazon**|[Kth Smallest Sum from Sorted Matrix Rows](https://www.fastprep.io/problems/amazon-kth-smallest-row-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-kth-smallest-row-sum)|Sep 13, 2026| |**Amazon**|[Meeting Room Scheduler](https://www.fastprep.io/problems/amazon-meeting-room-scheduler)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-meeting-room-scheduler)|Sep 13, 2026| |**Amazon**|[E-commerce Notification Router](https://www.fastprep.io/problems/amazon-ecommerce-notification-router)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-ecommerce-notification-router)|Sep 13, 2026| |**Amazon**|[Unique String Permutations](https://www.fastprep.io/problems/amazon-unique-string-permutations)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-unique-string-permutations)|Sep 13, 2026| |**Amazon**|[Three Sum Closest](https://www.fastprep.io/problems/amazon-three-sum-closest)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-three-sum-closest)|Sep 13, 2026| |**Amazon**|[Product of Array Except Self](https://www.fastprep.io/problems/amazon-product-array-except-self)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-product-array-except-self)|Sep 13, 2026| |**Amazon**|[Maximum Sum BST in a Binary Tree](https://www.fastprep.io/problems/amazon-maximum-sum-bst)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-sum-bst)|Sep 13, 2026| |**Amazon**|[Initial and Final Accounts in a Transfer Chain](https://www.fastprep.io/problems/amazon-transfer-chain-endpoints)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-transfer-chain-endpoints)|Sep 13, 2026| |**Amazon**|[Minimize Malware Spread in a Facility Network](https://www.fastprep.io/problems/amazon-minimize-malware-facility-network)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-minimize-malware-facility-network)|Sep 13, 2026| |**Amazon**|[Running Delivery Time Medians](https://www.fastprep.io/problems/amazon-running-delivery-time-medians)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-running-delivery-time-medians)|Sep 13, 2026| |**Amazon**|[Maximum Non-Adjacent House Value](https://www.fastprep.io/problems/amazon-maximum-non-adjacent-house-value)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-non-adjacent-house-value)|Sep 13, 2026| |**Amazon**|[Employee Ratings Management System](https://www.fastprep.io/problems/amazon-employee-ratings-data-structure)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-employee-ratings-data-structure)|Sep 13, 2026| |**Amazon**|[Binary Tree Cameras](https://www.fastprep.io/problems/amazon-binary-tree-cameras)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-binary-tree-cameras)|Sep 13, 2026| |**Amazon**|[Remove Duplicate Letters for the Largest Result](https://www.fastprep.io/problems/amazon-largest-lexicographic-unique-letters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-largest-lexicographic-unique-letters)|Sep 13, 2026| |**Amazon**|[Merge k Sorted Lists](https://www.fastprep.io/problems/amazon-merge-k-sorted-lists)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-merge-k-sorted-lists)|Sep 13, 2026| |**Amazon**|[Nodes at a Given N-ary Tree Level](https://www.fastprep.io/problems/amazon-nary-tree-nodes-at-level)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-nary-tree-nodes-at-level)|Sep 13, 2026| |**Amazon**|[Max Consecutive Ones III](https://www.fastprep.io/problems/amazon-max-consecutive-ones-iii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-max-consecutive-ones-iii)|Sep 13, 2026| |**Amazon**|[Maximum Profit in Job Scheduling](https://www.fastprep.io/problems/amazon-maximum-profit-job-scheduling)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-maximum-profit-job-scheduling)|Sep 13, 2026| |**Amazon**|[All Anagram Start Indices](https://www.fastprep.io/problems/amazon-anagram-start-indices)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-anagram-start-indices)|Sep 13, 2026| |**Amazon**|[Count Islands with Eight-Direction Adjacency](https://www.fastprep.io/problems/amazon-islands-eight-direction)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-islands-eight-direction)|Sep 13, 2026| |**Amazon**|[Maximum Saw Height for At Least M Cut Length](https://www.fastprep.io/problems/amazon-woodcut-saw-height)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-woodcut-saw-height)|Sep 13, 2026| |**Amazon**|[Unique Pairs in a 2D Matrix Summing to Target](https://www.fastprep.io/problems/amazon-unique-pairs-2d-target)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-unique-pairs-2d-target)|Sep 13, 2026| |**Amazon**|[First Missing Positive](https://www.fastprep.io/problems/amazon-first-missing-positive)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-first-missing-positive)|Sep 13, 2026| |**Amazon**|[Word Break II](https://www.fastprep.io/problems/amazon-word-break-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-word-break-ii)|Sep 13, 2026| |**Amazon**|[Binary Tree Right View](https://www.fastprep.io/problems/amazon-binary-tree-right-view)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-binary-tree-right-view)|Sep 13, 2026| |**Amazon**|[Next Permutation](https://www.fastprep.io/problems/amazon-next-permutation)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-next-permutation)|Sep 13, 2026| |**Amazon**|[Construct a Tree from Level-Order and Inorder Traversals](https://www.fastprep.io/problems/amazon-construct-tree-level-inorder)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-construct-tree-level-inorder)|Sep 13, 2026| |**Amazon**|[Longest Happy Prefix](https://www.fastprep.io/problems/amazon-longest-happy-prefix)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-longest-happy-prefix)|Sep 13, 2026| |**Google**|[Balanced Parentheses with Sequential Left Deletions](https://www.fastprep.io/problems/google-balanced-parentheses-left-deletions)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-balanced-parentheses-left-deletions)|Sep 13, 2026| |**Amazon**|[Calculate Beauty Values](https://www.fastprep.io/problems/amazon-calculate-beauty-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-calculate-beauty-values)|Sep 13, 2026| |**Scribd**|[Build a Reliable Event Write Handler](https://www.fastprep.io/project-coding/scribd-reliable-event-write-handler)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/scribd-reliable-event-write-handler)|Sep 13, 2026| |**Scribd**|[Design an External-Model Document Enrichment Pipeline](https://www.fastprep.io/system-design/external-model-document-enrichment-pipeline)|System design|[![Practice][p]](https://www.fastprep.io/system-design/external-model-document-enrichment-pipeline)|Sep 13, 2026| |**ByteDance / Google**|[Design a Multimedia Content Moderation Platform](https://www.fastprep.io/system-design/multimedia-content-moderation-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/multimedia-content-moderation-platform)|Sep 13, 2026| |**Citadel**|[Maximize Workday Earnings](https://www.fastprep.io/problems/citadel-maximize-workday-earnings)|Coding|[![Practice][p]](https://www.fastprep.io/problems/citadel-maximize-workday-earnings)|Sep 13, 2026| |**Scribd**|[Most Popular Actor by Movie Views](https://www.fastprep.io/problems/scribd-most-popular-actor-by-movie-views)|Coding|[![Practice][p]](https://www.fastprep.io/problems/scribd-most-popular-actor-by-movie-views)|Sep 13, 2026| |**Headlands Technologies**|[Minimum Changes for Distinct Adjacent Characters](https://www.fastprep.io/problems/headlands-minimum-changes-no-equal-adjacent-characters)|Coding|[![Practice][p]](https://www.fastprep.io/problems/headlands-minimum-changes-no-equal-adjacent-characters)|Sep 13, 2026| |**Headlands Technologies**|[Sliding-Window Means with IEEE Special Values](https://www.fastprep.io/problems/headlands-sliding-window-means-ieee-floats)|Coding|[![Practice][p]](https://www.fastprep.io/problems/headlands-sliding-window-means-ieee-floats)|Sep 13, 2026| |**Shopify**|[Build a Bank Account Utility](https://www.fastprep.io/project-coding/shopify-bank-account-utility)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/shopify-bank-account-utility)|Sep 13, 2026| |**Google**|[Shortest Subarray With at Least K Distinct Values](https://www.fastprep.io/problems/google-shortest-subarray-at-least-k-distinct-values)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-shortest-subarray-at-least-k-distinct-values)|Sep 13, 2026| |**Morgan Stanley**|[Maximum Concurrent Processes](https://www.fastprep.io/problems/morgan-stanley-maximum-concurrent-processes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/morgan-stanley-maximum-concurrent-processes)|Sep 12, 2026| |**Google**|[Lexicographically Smallest K-Step Return Walk](https://www.fastprep.io/problems/google-lexicographically-smallest-k-step-return-walk)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-lexicographically-smallest-k-step-return-walk)|Sep 12, 2026| |**Tekion**|[Dungeon Game](https://www.fastprep.io/problems/tekion-dungeon-game)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tekion-dungeon-game)|Sep 12, 2026| |**Tekion**|[IPO](https://www.fastprep.io/problems/tekion-ipo)|Coding|[![Practice][p]](https://www.fastprep.io/problems/tekion-ipo)|Sep 12, 2026| |**Hudson River Trading**|[Lowest Number in an Open Range](https://www.fastprep.io/problems/hrt-lowest-number-in-open-range)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-lowest-number-in-open-range)|Sep 12, 2026| |**Hudson River Trading**|[Maximum Rhombic Area Sum](https://www.fastprep.io/problems/hrt-maximum-rhombic-area-sum)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-maximum-rhombic-area-sum)|Sep 12, 2026| |**Hudson River Trading**|[Count One-Swap Number Pairs](https://www.fastprep.io/problems/hrt-count-one-swap-number-pairs)|Coding|[![Practice][p]](https://www.fastprep.io/problems/hrt-count-one-swap-number-pairs)|Sep 12, 2026| |**Apple**|[Merge Two Strings by Maximum Boundary Overlap](https://www.fastprep.io/problems/apple-factorize-string-extremities)|Coding|[![Practice][p]](https://www.fastprep.io/problems/apple-factorize-string-extremities)|Sep 12, 2026| |**SquadStack.ai**|[Minimum-Cost Digit String Decoding](https://www.fastprep.io/problems/squadstack-weighted-decode-ways)|Coding|[![Practice][p]](https://www.fastprep.io/problems/squadstack-weighted-decode-ways)|Sep 12, 2026| |**SquadStack.ai**|[Minimum Seats for One-Way Car Pooling](https://www.fastprep.io/problems/squadstack-minimum-seats-car-pooling)|Coding|[![Practice][p]](https://www.fastprep.io/problems/squadstack-minimum-seats-car-pooling)|Sep 12, 2026| |**SquadStack.ai**|[Find the Dominant Seller](https://www.fastprep.io/problems/squadstack-dominant-seller)|SQL|[![Practice][p]](https://www.fastprep.io/problems/squadstack-dominant-seller)|Sep 12, 2026| |**Amazon / Goldman Sachs**|[Repair recurring payments in the Wallet backend](https://www.fastprep.io/project-coding/repair-recurring-wallet-payments)|AI coding|[![Practice][p]](https://www.fastprep.io/project-coding/repair-recurring-wallet-payments)|Sep 12, 2026| |**Bobyard**|[Design an Ordered Canvas Operation Coordinator](https://www.fastprep.io/low-level-design/ordered-canvas-operation-coordinator)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/ordered-canvas-operation-coordinator)|Sep 12, 2026| |**Google / Microsoft**|[Design and Implement a Highway Toll Session Domain](https://www.fastprep.io/low-level-design/highway-toll-session-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/highway-toll-session-domain)|Sep 12, 2026| |**ByteDance**|[Design an Advertiser Campaign Configuration Platform](https://www.fastprep.io/system-design/advertiser-campaign-configuration-platform)|System design|[![Practice][p]](https://www.fastprep.io/system-design/advertiser-campaign-configuration-platform)|Sep 12, 2026| |**Bobyard**|[Design an Asynchronous Random Image Generation Service](https://www.fastprep.io/system-design/asynchronous-random-image-generation-service)|System design|[![Practice][p]](https://www.fastprep.io/system-design/asynchronous-random-image-generation-service)|Sep 12, 2026| |**Amazon**|[Word Search II](https://www.fastprep.io/problems/amazon-word-search-ii)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-word-search-ii)|Sep 12, 2026| |**Amazon**|[Interleaving String](https://www.fastprep.io/problems/amazon-interleaving-string)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-interleaving-string)|Sep 12, 2026| |**Amazon**|[Dynamic Prefix Search Collection](https://www.fastprep.io/problems/amazon-prefix-search-collection)|Coding|[![Practice][p]](https://www.fastprep.io/problems/amazon-prefix-search-collection)|Sep 12, 2026| |**Google**|[Read-Optimized Duplicate Windows](https://www.fastprep.io/problems/google-read-optimized-window-duplicates)|Coding|[![Practice][p]](https://www.fastprep.io/problems/google-read-optimized-window-duplicates)|Sep 12, 2026| |**LinkedIn**|[Max Stack](https://www.fastprep.io/problems/linkedin-max-stack)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-max-stack)|Sep 12, 2026| |**Optiver**|[Design and Implement an In-Memory Order Book](https://www.fastprep.io/low-level-design/in-memory-order-book)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/in-memory-order-book)|Sep 12, 2026| |**The D.E. Shaw Group**|[Design a Ride-Hailing Class Model](https://www.fastprep.io/low-level-design/ride-hailing-class-design)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/ride-hailing-class-design)|Sep 11, 2026| |**FlexTrade**|[Extract Error Log Context](https://www.fastprep.io/problems/flextrade-extract-error-log-context)|Coding|[![Practice][p]](https://www.fastprep.io/problems/flextrade-extract-error-log-context)|Sep 11, 2026| |**Blinkit**|[LRU Cache](https://www.fastprep.io/problems/blinkit-lru-cache)|Coding|[![Practice][p]](https://www.fastprep.io/problems/blinkit-lru-cache)|Sep 11, 2026| |**Blinkit**|[Search in Rotated Sorted Array](https://www.fastprep.io/problems/blinkit-search-in-rotated-sorted-array)|Coding|[![Practice][p]](https://www.fastprep.io/problems/blinkit-search-in-rotated-sorted-array)|Sep 11, 2026| |**Brex**|[Concurrent Discounted Card Purchases](https://www.fastprep.io/problems/brex-concurrent-discounted-card-purchases)|Coding|[![Practice][p]](https://www.fastprep.io/problems/brex-concurrent-discounted-card-purchases)|Sep 11, 2026| |**The D. E. Shaw Group**|[Decode Ways](https://www.fastprep.io/problems/de-shaw-decode-ways)|Coding|[![Practice][p]](https://www.fastprep.io/problems/de-shaw-decode-ways)|Sep 11, 2026| |**The D. E. Shaw Group**|[Remove K Digits](https://www.fastprep.io/problems/de-shaw-remove-k-digits)|Coding|[![Practice][p]](https://www.fastprep.io/problems/de-shaw-remove-k-digits)|Sep 11, 2026| |**Kickdrum**|[Students and Instructors for Database Systems](https://www.fastprep.io/problems/kickdrum-students-and-instructors-for-database-systems)|SQL|[![Practice][p]](https://www.fastprep.io/problems/kickdrum-students-and-instructors-for-database-systems)|Sep 11, 2026| |**Kickdrum**|[Undo/Redo Timeline State Engine](https://www.fastprep.io/problems/kickdrum-undo-redo-timeline-state-engine)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kickdrum-undo-redo-timeline-state-engine)|Sep 11, 2026| |**Kickdrum**|[Wormhole Spacecraft Overtakes](https://www.fastprep.io/problems/kickdrum-wormhole-spacecraft-overtakes)|Coding|[![Practice][p]](https://www.fastprep.io/problems/kickdrum-wormhole-spacecraft-overtakes)|Sep 11, 2026| |**Replit**|[Compress Editor Actions into Operational Transform Operations](https://www.fastprep.io/problems/replit-compress-editor-actions-to-ot)|Coding|[![Practice][p]](https://www.fastprep.io/problems/replit-compress-editor-actions-to-ot)|Sep 11, 2026| |**Toptal**|[Valid Times on a Digital Clock](https://www.fastprep.io/problems/toptal-valid-times-on-a-digital-clock)|Coding|[![Practice][p]](https://www.fastprep.io/problems/toptal-valid-times-on-a-digital-clock)|Sep 11, 2026| |**FlexTrade**|[Design Fault Localization for a Large Function Graph](https://www.fastprep.io/system-design/fault-localization-for-large-function-graph)|System design|[![Practice][p]](https://www.fastprep.io/system-design/fault-localization-for-large-function-graph)|Sep 11, 2026| |**FlexTrade**|[Diagnose a Three-Stage Data Pipeline Latency Regression](https://www.fastprep.io/system-design/three-stage-pipeline-latency-diagnosis)|System design|[![Practice][p]](https://www.fastprep.io/system-design/three-stage-pipeline-latency-diagnosis)|Sep 11, 2026| |**FlexTrade**|[Diagnose Memory Growth in a Long-Running Process](https://www.fastprep.io/system-design/long-running-process-memory-growth-diagnosis)|System design|[![Practice][p]](https://www.fastprep.io/system-design/long-running-process-memory-growth-diagnosis)|Sep 11, 2026| |**Goldman Sachs**|[Minimum Distinct Prefix Cost](https://www.fastprep.io/problems/goldman-sachs-minimum-distinct-prefix-cost)|Coding|[![Practice][p]](https://www.fastprep.io/problems/goldman-sachs-minimum-distinct-prefix-cost)|Sep 11, 2026| |**Wayfair**|[Design a Rental Product Circulation Domain](https://www.fastprep.io/low-level-design/rental-product-circulation-domain)|Low-level design|[![Practice][p]](https://www.fastprep.io/low-level-design/rental-product-circulation-domain)|Sep 11, 2026| |**Charta Health**|[Concurrent Token-Bucket Rate Limiter](https://www.fastprep.io/problems/charta-health-concurrent-token-bucket-rate-limiter)|Coding|[![Practice][p]](https://www.fastprep.io/problems/charta-health-concurrent-token-bucket-rate-limiter)|Sep 11, 2026| |**ByteDance**|[Delete K Values to Balance Index Sums](https://www.fastprep.io/problems/bytedance-delete-k-balance-index-sums)|Coding|[![Practice][p]](https://www.fastprep.io/problems/bytedance-delete-k-balance-index-sums)|Sep 11, 2026| |**Charta Health**|[Inorder Successor in a Binary Search Tree](https://www.fastprep.io/problems/charta-bst-inorder-successor)|Coding|[![Practice][p]](https://www.fastprep.io/problems/charta-bst-inorder-successor)|Sep 11, 2026| |**Coinbase**|[Task Management System](https://www.fastprep.io/problems/coinbase-task-management-system)|Coding|[![Practice][p]](https://www.fastprep.io/problems/coinbase-task-management-system)|Sep 11, 2026| |**Fireworks AI**|[Mutual-Friend Referral Recommendations](https://www.fastprep.io/problems/fireworks-ai-mutual-friend-referrals)|Coding|[![Practice][p]](https://www.fastprep.io/problems/fireworks-ai-mutual-friend-referrals)|Sep 11, 2026| |**LinkedIn**|[Uniform 0-6 from an Unknown Biased Bit](https://www.fastprep.io/problems/linkedin-uniform-seven-from-biased-bit)|Coding|[![Practice][p]](https://www.fastprep.io/problems/linkedin-uniform-seven-from-biased-bit)|Sep 11, 2026| |**Lyft**|[Globally Versioned Key-Value Store](https://www.fastprep.io/problems/lyft-globally-versioned-key-value-store)|Coding|[![Practice][p]](https://www.fastprep.io/problems/lyft-globally-versioned-key-value-store)|Sep 11, 2026| |**Nextdoor**|[In-Memory Database with Transactions and Savepoints](https://www.fastprep.io/problems/nextdoor-in-memory-database-savepoints)|Coding|[![Practice][p]](https://www.fastprep.io/problems/nextdoor-in-memory-database-savepoints)|Sep 11, 2026| |**Pure Storage**|[Rasterize a Circle with Integer Pixels](https://www.fastprep.io/problems/pure-storage-midpoint-circle-pixels)|Coding|[![Practice][p]](https://www.fastprep.io/problems/pure-storage-midpoint-circle-pixels)|Sep 11, 2026|