| Solve probability and stopping questions Data Scientist | Hard | Mar 14, 2026 |
| Sort a Nearly Sorted Array Data ScientistCoding | Hard | Feb 21, 2026 |
| Solve Classic Probability Questions Data Scientist | Hard | Feb 21, 2026 |
| Implement a single-producer multi-consumer ring buffer Software EngineerCoding | Medium | Feb 21, 2026 |
| Analyze Correlations and Generate Gaussians Data Scientist | Medium | Feb 21, 2026 |
| Compute BBO and NBBO from order data Software EngineerCoding | Medium | Feb 12, 2026 |
| Simulate 2048 and pack board into uint64 Software EngineerCoding | Medium | Feb 11, 2026 |
| Implement task queue with insert, delete, execute Software EngineerCoding | Medium | Feb 11, 2026 |
| Implement LRU/LFU cache with custom eviction Software EngineerCoding | Easy | Feb 11, 2026 |
| Design dynamic weighted random sampling with updates Software EngineerCoding | Medium | Feb 11, 2026 |
| Design alerting for application-to-exchange mappings Software EngineerSystem Design | Medium | Feb 11, 2026 |
| Compute maximum later-earlier difference Software EngineerCoding | Medium | Feb 11, 2026 |
| Find constant minimizing absolute error Data Scientist | Easy | Feb 10, 2026 |
| Merge K timestamped lists with timestamp coalescing Software EngineerCoding | Medium | Jan 22, 2026 |
| Implement array merge, round-robin scheduler, and trading simulator Software EngineerCoding | Medium | Jan 22, 2026 |
| How do you handle conflict at work? Software EngineerBehavioral | Medium | Jan 22, 2026 |
| Design stock price time-series store and query Software EngineerSystem Design | Easy | Jan 22, 2026 |
| Return nodes on a tree diameter path Software EngineerCoding | Medium | Jan 9, 2026 |
| Design a token manager with lazy expiration Software EngineerCoding | Medium | Jan 9, 2026 |
| Check whether a string is a palindrome Software EngineerCoding | Medium | Jan 9, 2026 |
| Determine order of alien alphabet Software EngineerCoding | Hard | Jan 6, 2026 |
| Implement an in-memory order book API Software EngineerCoding | Easy | Jan 1, 2026 |
| Compute max team size with a core interval Software EngineerCoding | Medium | Dec 25, 2025 |
| Discuss PhD coursework and research impact Data ScientistBehavioral | Medium | Oct 13, 2025 |
| Estimate OLS via streaming sufficient statistics Data Scientist | Hard | Oct 13, 2025 |
| Derive distribution of an inverse transform Data Scientist | Medium | Oct 13, 2025 |
| Design city home-price prediction system Data Scientist | Hard | Oct 13, 2025 |
| Diagnose outliers and influence in linear regression Data Scientist | Hard | Oct 13, 2025 |
| Explain RF optimization and variable-importance pitfalls Data Scientist | Medium | Oct 13, 2025 |
| Implement lazy unique-merge generator for sorted streams Data ScientistCoding | Medium | Oct 13, 2025 |
| Implement left join on Python lists, no packages Data Scientist | Medium | Oct 13, 2025 |
| Relate Y-on-X and X-on-Y coefficients Data Scientist | Medium | Oct 13, 2025 |
| Derive lower bound for equicorrelation rho Data Scientist | Medium | Oct 13, 2025 |
| Implement max profit with K transactions (DP) Data ScientistCoding | Medium | Oct 13, 2025 |
| Compute P(third Ace | Ace in first two) Data Scientist | Medium | Oct 13, 2025 |
| Stabilize LLM inference and estimate needed repeats Data ScientistSystem Design | Medium | Oct 9, 2025 |
| Match a string with wildcard pattern recursively Data ScientistCoding | Medium | Oct 9, 2025 |
| Explain factor leakage checks and IC/ICIR filtering Data Scientist | Medium | Oct 9, 2025 |
| Solve four algorithmic problems Software EngineerCoding | Medium | Sep 6, 2025 |
| Find earliest common meeting slot Software EngineerCoding | Medium | Sep 6, 2025 |
| Explain role, motivations, values, and relocation expectations Software EngineerBehavioral | Easy | Sep 6, 2025 |
| Explain career motivations and choices Software EngineerBehavioral | Medium | Sep 6, 2025 |
| Discuss queues, NoSQL, and concurrency Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Design regression and classification ML pipelines Data Scientist | Hard | Sep 6, 2025 |
| Describe current work and relocation willingness Software EngineerBehavioral | Medium | Sep 6, 2025 |
| Build models for housing and wind power prediction Software EngineerSystem Design | Hard | Sep 6, 2025 |
| Introduce your background and motivations Data ScientistBehavioral | Medium | Aug 13, 2025 |
| Design a time-series home-buy decision classifier Data ScientistSystem Design | Hard | Aug 13, 2025 |
| Build a regression model for wind power output Data ScientistSystem Design | Hard | Aug 13, 2025 |
| Solve probability and expectation problems Data Scientist | Medium | Aug 11, 2025 |
| Design a low-latency trading system Software EngineerSystem Design | Hard | Aug 9, 2025 |
| Perform EDA and diagnose data quality Data Scientist | Medium | Aug 8, 2025 |
| Build a baseline linear regression pipeline Data Scientist | Medium | Aug 8, 2025 |
| Explain background, priorities, and relocation terms Software EngineerBehavioral | Medium | Aug 7, 2025 |
| Minimize image processing cost with discount Software EngineerCoding | Medium | Aug 4, 2025 |
| Minimize changes for k-periodic palindrome Software EngineerCoding | Medium | Aug 4, 2025 |
| Compute variance of trading profits Data Scientist | Medium | Aug 4, 2025 |
| Optimize password transform and discount scheduling Software EngineerCoding | Medium | Aug 1, 2025 |
| Analyze profits under random walk and Brownian motion Data Scientist | Hard | Aug 1, 2025 |
| Implement two-pointer unique-pair sum search Data ScientistCoding | Medium | Jul 27, 2025 |
| Explain multicollinearity and OLS assumptions Data Scientist | Medium | Jul 27, 2025 |
| Explain JS types, Promises, Maps, WebSockets Software Engineer | Medium | Jul 26, 2025 |
| Explain hash maps and solve array intersection Software EngineerCoding | Medium | Jul 26, 2025 |
| Solve two DS&A optimization problems Software EngineerCoding | Medium | Jul 16, 2025 |
| Make a hard MoE router differentiable Machine Learning Engineer | Hard | Jul 15, 2025 |
| Maximize Stock Trading Profits Using Dynamic Programming Data ScientistCoding | Medium | Jul 12, 2025 |
| Implement Left Join Using Python Dictionaries Efficiently Data Scientist | Medium | Jul 12, 2025 |
| Implement Infinite Fibonacci Generator Using Lazy Evaluation Data ScientistCoding | Medium | Jul 12, 2025 |
| Design Framework for Robust House-Price Prediction Model Data Scientist | Hard | Jul 12, 2025 |
| Describe Your Proudest Graduate-Level Achievement and Its Impact Data ScientistBehavioral | Medium | Jul 12, 2025 |
| Derive Coefficient and Covariance in Regression Analysis Data Scientist | Medium | Jul 12, 2025 |
| Calculate Probability of Third Card Being an Ace Data Scientist | Medium | Jul 12, 2025 |
