| Implement an In-Memory Database Software EngineerCoding | Hard | Apr 29, 2026 |
| Implement a Coin-Constrained Jump Strategy Software EngineerCoding | Hard | Apr 29, 2026 |
| Implement Game Physics and Block Mining Software EngineerCoding | Hard | Apr 2, 2026 |
| Design Crypto Order Routing Software EngineerSystem Design | Hard | Apr 2, 2026 |
| Debug and Extend Cursor Queries Software EngineerCoding | Hard | Apr 2, 2026 |
| Compute Total Manual Distance Software EngineerCoding | Medium | Mar 29, 2026 |
| Implement a Flappy Bird Jump Agent Software EngineerCoding | Medium | Mar 25, 2026 |
| Implement Plus One Data ScientistCoding | Medium | Mar 17, 2026 |
| Design an Identity Trust Experiment Data ScientistProduct Sense | Medium | Mar 17, 2026 |
| Implement a crypto order management system Software EngineerCoding | Hard | Mar 1, 2026 |
| Generate NFT metadata and ensure uniqueness Software EngineerCoding | Hard | Mar 1, 2026 |
| Design a crypto trading web frontend Software EngineerSystem Design | Hard | Feb 23, 2026 |
| Maximize block fee with transaction selection Software EngineerCoding | Hard | Feb 13, 2026 |
| Implement Plus One Data ScientistCoding | Medium | Feb 13, 2026 |
| Design Identity-Trust A/B Test Data ScientistProduct Sense | Medium | Feb 13, 2026 |
| Calculate a Confidence Interval Data Scientist | Medium | Feb 13, 2026 |
| Parse logs and generate NFT attributes Software EngineerCoding | Medium | Feb 12, 2026 |
| Select transactions to maximize fees under size Software EngineerCoding | Medium | Feb 11, 2026 |
| Design query pagination for large datasets Software EngineerSystem Design | Medium | Feb 11, 2026 |
| Design a task management system with TTL Software EngineerCoding | Medium | Feb 11, 2026 |
| Implement local maxima, bagging, and k-means Machine Learning EngineerCoding | Hard | Feb 1, 2026 |
| Explain precision/recall and compute NN output Machine Learning Engineer | Hard | Feb 1, 2026 |
| Implement cursor-based query pagination Software EngineerCoding | Medium | Jan 22, 2026 |
| Implement banking, knapsack, and pagination tasks Software EngineerCoding | Hard | Jan 22, 2026 |
| Design real-time crypto prices homepage Software EngineerSystem Design | Hard | Jan 22, 2026 |
| Design a food delivery system Software EngineerSystem Design | Medium | Jan 22, 2026 |
| Implement a blog feed with fetching and state Software EngineerCoding | Medium | Jan 6, 2026 |
| Implement cloud storage with quotas and compression Software EngineerCoding | Medium | Dec 25, 2025 |
| Solve restaurant path and order event tasks Software EngineerCoding | Medium | Dec 8, 2025 |
| Paginate forward and backward through results Software EngineerCoding | Medium | Dec 8, 2025 |
| Implement basic pagination for a list Software EngineerCoding | Medium | Dec 8, 2025 |
| Design crypto trading order control API Software EngineerCoding | Medium | Dec 8, 2025 |
| Design a blob storage system for lunar environment Software EngineerSystem Design | Medium | Dec 8, 2025 |
| Describe cross-team collaboration on past projects Software EngineerBehavioral | Medium | Dec 8, 2025 |
| Write SQL to rank top products per category Machine Learning EngineerCoding | Medium | Dec 4, 2025 |
| Build a baseline classification model from messy data Machine Learning Engineer | Medium | Dec 4, 2025 |
| Implement a versioned recipe management system Software EngineerCoding | Medium | Nov 23, 2025 |
| Design an in-memory database with TTL and backups Software EngineerCoding | Medium | Nov 8, 2025 |
| Build and evaluate a conversion prediction model Data Scientist | Hard | Oct 13, 2025 |
| Compute adoption, latency, and cross-region transactions Data Scientist | Medium | Oct 13, 2025 |
| Write SQL: sum values ≤ each row’s value Data Scientist | Medium | Oct 13, 2025 |
| Diagnose uplift drop in email A/B tests Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Detect sequence rule and repair anomaly Data ScientistCoding | Medium | Oct 13, 2025 |
| Write SQL and Python for funnels/retention Data Scientist | Medium | Oct 13, 2025 |
| Explain handling pressure to bend rules Data ScientistBehavioral | Medium | Oct 13, 2025 |
| Optimize no-penalty test strategy Data Scientist | Medium | Oct 13, 2025 |
| Show culture add at Coinbase Data ScientistBehavioral | Medium | Oct 13, 2025 |
| Solve the 12-coin balance puzzle Data Scientist | Hard | Oct 13, 2025 |
| Detect and quantify wash trading Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Design KYC experiment amid crypto volatility Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Compute wallet-link probabilities and conditionals Data Scientist | Medium | Oct 13, 2025 |
| Diagnose a 20% retail revenue drop Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Estimate Super Bowl QR ad sign-ups Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Compute wallet-link probabilities and expectation Data Scientist | Medium | Oct 13, 2025 |
| Estimate Super Bowl QR-driven registrations Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Evaluate campaign success and decide new trading pair Data ScientistProduct Sense | Easy | Sep 20, 2025 |
| Compute probability at least one user uses feature Data Scientist | Easy | Sep 20, 2025 |
| Maximize profit with transaction fees Software EngineerCoding | Medium | Sep 6, 2025 |
| Implement top-K over a stream Software EngineerCoding | Medium | Sep 6, 2025 |
| Implement filters and cursor pagination Software Engineer | Medium | Sep 6, 2025 |
| Implement Composable Range Iterators Software EngineerCoding | Medium | Sep 6, 2025 |
| Implement banking ops: transfer, top-k, cashback, merge Software EngineerCoding | Medium | Sep 6, 2025 |
| Implement a Simple Banking Ledger Software EngineerCoding | Medium | Sep 6, 2025 |
| Implement a multi-step form in React Software EngineerSystem Design | Medium | Sep 6, 2025 |
| Generate Weighted Random NFTs with Updates Software EngineerCoding | Medium | Sep 6, 2025 |
| Explain your proudest project Software EngineerBehavioral | Medium | Sep 6, 2025 |
| Design scheduled payments and cancellation Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Design real-time stock price viewer Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Design account opening workflow Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Design a reusable React comment component Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Design a bank account ledger Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Clarify CodeSignal partial credit and score access Software Engineer | Easy | Sep 6, 2025 |
| Design a scalable URL shortener with expiration and security Software EngineerSystem Design | Hard | Aug 12, 2025 |
| Maximize profit with transaction fee Software EngineerCoding | Medium | Aug 8, 2025 |
| Implement filtered transactions with cursor pagination Software Engineer | Medium | Aug 8, 2025 |
| Discuss your proudest project Software EngineerBehavioral | Medium | Aug 8, 2025 |
| Design a scheduled payments service Software EngineerSystem Design | Hard | Aug 8, 2025 |
| Design a basic banking system Software EngineerSystem Design | Hard | Aug 8, 2025 |
| Recommend movies by shared ratings Software EngineerCoding | Medium | Aug 7, 2025 |
| Design image upload end-to-end Software EngineerSystem Design | Hard | Aug 7, 2025 |
| Count users over n connections Software EngineerCoding | Medium | Aug 7, 2025 |
| Process food delivery data queries Software EngineerCoding | Medium | Aug 4, 2025 |
| Implement debounced autocomplete component Software EngineerSystem Design | Medium | Aug 4, 2025 |
| Implement custom Java iterators Software EngineerCoding | Medium | Aug 4, 2025 |
| Implement custom iterator classes Software EngineerCoding | Medium | Aug 4, 2025 |
| Implement bank balance operations Software EngineerCoding | Medium | Aug 4, 2025 |
| Discuss complex project choices Software EngineerBehavioral | Medium | Aug 4, 2025 |
| Design cryptocurrency trading platform Software EngineerSystem Design | Hard | Aug 4, 2025 |
| Design crypto trading system Software EngineerSystem Design | Hard | Aug 4, 2025 |
| Analyze food-delivery data Software EngineerCoding | Medium | Aug 4, 2025 |
| Model Feature Adoption Probability for Users Data Scientist | Easy | Aug 4, 2025 |
| Investigate Sudden Revenue Drop: Steps and Metrics Analyzed Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Investigate Sudden Decline in Coinbase Revenue Metric Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Investigate Retail Revenue Decline and Analyze QR-Code Impact Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Investigate Anomalies in Coinbase Wallet Engagement Metrics Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Estimate Viewer Engagement with Super Bowl QR Code Promo Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Estimate Super Bowl QR Code Scan Rate Using Historical Data Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Estimate QR Code Scan Rate for Super Bowl Ad Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Diagnose Revenue Decline: Key Analyses and Metrics Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Diagnose Retail Revenue Drop and Predict Ad Impact Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Determine Conditions for Multiplying Event Probabilities in Statistics Data Scientist | Easy | Aug 4, 2025 |
| Calculate Expected Users Adopting Wallet Feature Data Scientist | Easy | Aug 4, 2025 |
| Calculate Expected Links and Conditional Probability for Users Data Scientist | Easy | Aug 4, 2025 |
| Implement debounced async autocomplete input Software Engineer | Medium | Aug 1, 2025 |
| Explain motivation, UX quality, and change handling Software EngineerBehavioral | Medium | Aug 1, 2025 |
| Implement iterators and write tests in Java Software EngineerCoding | Medium | Jul 31, 2025 |
| Implement custom iterators and interfaces Software EngineerCoding | Medium | Jul 31, 2025 |
| Handle recruiter transparency and background checks Software EngineerBehavioral | Medium | Jul 31, 2025 |
| Discuss complex project and multi-approach example Software EngineerBehavioral | Medium | Jul 31, 2025 |
| Design cryptocurrency trading with third-party exchanges Software EngineerSystem Design | Hard | Jul 31, 2025 |
| Design a crypto trading platform Software EngineerSystem Design | Hard | Jul 31, 2025 |
| Compute prices, distances, and Top-K for orders Software EngineerCoding | Medium | Jul 31, 2025 |
| Compute delivery metrics and top-K queries Software Engineer | Medium | Jul 31, 2025 |
| Design cloud storage system Software EngineerSystem Design | Medium | Jul 29, 2025 |
| Design account system with cashback Software EngineerSystem Design | Medium | Jul 29, 2025 |
| Implement bank account with cashback Software EngineerCoding | Medium | Jul 29, 2025 |
| Generate constrained NFT metadata Software EngineerCoding | Medium | Jul 26, 2025 |
| Design real-time exchange data sync system Software EngineerSystem Design | Hard | Jul 26, 2025 |
| Design order stream with state transitions Software EngineerCoding | Medium | Jul 26, 2025 |
| Solve Aptitude Test: Logical, Numerical, Verbal Reasoning Data ScientistCoding | Medium | Jul 12, 2025 |
| Investigate Super Bowl Ad Impact on User Sign-Ups and Revenue Data ScientistProduct Sense | Medium | Jul 12, 2025 |
| How to Analyze and Model Behavioral Data Effectively? Data Scientist | Hard | Jul 12, 2025 |
| Evaluate Integrity in Workplace Culture Through HR Screening Data ScientistBehavioral | Easy | Jul 12, 2025 |
| Estimate Successful Sign-ups from Super Bowl QR Code Ad Data ScientistProduct Sense | Medium | Jul 12, 2025 |
| Diagnose Discrepancy in A/B Test Conversion Rate Results Data ScientistProduct Sense | Medium | Jul 12, 2025 |
| Calculate Probability of Wallet Linking Among Users Data Scientist | Easy | Jul 12, 2025 |
| Calculate Expected Users Linking Coinbase Wallets Data Scientist | Easy | Jul 12, 2025 |
| Calculate Cumulative Sum for Each Integer in Table Data Scientist | Medium | Jul 12, 2025 |
| Calculate Adoption and Transaction Rates, Identify Cross-Region Sales Data Scientist | Medium | Jul 12, 2025 |
| Analyze Factors Behind 20% Retail Revenue Decline Data ScientistProduct Sense | Medium | Jul 12, 2025 |
