| Minimize a String Using Allowed Swaps Software EngineerCoding | Medium | Apr 14, 2026 |
| Design a Payment Fraud Detection Service Software EngineerSystem Design | Medium | Apr 14, 2026 |
| Design a Cross-Border Money Transfer Service Software EngineerSystem Design | Medium | Apr 14, 2026 |
| Why does the CLT matter? Data Scientist | Medium | Mar 14, 2026 |
| How would you measure impact? Data ScientistProduct Sense | Medium | Mar 14, 2026 |
| How to validate production models? Data Scientist | Medium | Mar 14, 2026 |
| How to evaluate a new homepage feature Data ScientistProduct Sense | Easy | Feb 15, 2026 |
| Compute variance of a list in Python Data ScientistCoding | Easy | Feb 15, 2026 |
| Write SQL using HAVING and window functions Data Scientist | Easy | Jan 17, 2026 |
| Explain list vs tuple in Python Data ScientistCoding | Easy | Jan 17, 2026 |
| Explain and interpret p-values correctly Data Scientist | Easy | Jan 17, 2026 |
| Design and evaluate a fraud detection strategy Data ScientistProduct Sense | Easy | Jan 17, 2026 |
| Solve common search/parse/graph frequency tasks Software EngineerCoding | Medium | Jan 6, 2026 |
| Explain confounding with an Uber example Data Scientist | Easy | Dec 16, 2025 |
| Design metrics and experiment for donation feature Data ScientistProduct Sense | Easy | Dec 16, 2025 |
| Answer career, manager, and team fit questions Data ScientistBehavioral | Easy | Dec 16, 2025 |
| Should you play a dice payout game? Data Scientist | Easy | Nov 3, 2025 |
| Reduce airport cancellations under causal constraints Data ScientistProduct Sense | Easy | Nov 3, 2025 |
| Compute top orders and cancellation rate Data Scientist | Easy | Nov 3, 2025 |
| Implement sliding-window device anomaly Data ScientistCoding | Medium | Oct 13, 2025 |
| Influence policy with BI deliverables Data ScientistBehavioral | Hard | Oct 13, 2025 |
| Build a real-time ATO model Data Scientist | Hard | Oct 13, 2025 |
| Optimize thresholds under fraud costs Data Scientist | Medium | Oct 13, 2025 |
| Design an A/B for ATO rule Data ScientistProduct Sense | Hard | Oct 13, 2025 |
| Write SQL to flag Venmo ATO Data Scientist | Medium | Oct 13, 2025 |
| Present an A/B test project review Data ScientistProduct Sense | Easy | Oct 10, 2025 |
| Explain p-values and interpret regressions Data Scientist | Easy | Oct 10, 2025 |
| Evaluate smart cart idea and design experiment Data ScientistProduct Sense | Easy | Oct 10, 2025 |
| Diagnose drop in shopper order acceptance Data ScientistProduct Sense | Easy | Oct 10, 2025 |
| Search a word in a grid Machine Learning EngineerCoding | Medium | Sep 6, 2025 |
| Maximize ones with limited flips Machine Learning EngineerCoding | Medium | Sep 6, 2025 |
| Design RL-based spending limit policy Machine Learning EngineerSystem Design | Hard | Sep 6, 2025 |
| Design a traditional fraud detection system Machine Learning EngineerSystem Design | Hard | Sep 6, 2025 |
| Assess LLMs for fraud detection Machine Learning Engineer | Hard | Sep 6, 2025 |
| Find k most frequent in linear time Software EngineerCoding | Medium | Aug 13, 2025 |
| Explain Java volatile semantics Software EngineerCoding | Medium | Aug 7, 2025 |
| Explain HashMap internals and collisions Software EngineerCoding | Medium | Aug 7, 2025 |
| Explain AtomicInteger and ABA problem Software EngineerCoding | Medium | Aug 7, 2025 |
| Detect memory leaks in C++ Software EngineerCoding | Medium | Aug 7, 2025 |
| Describe std::string copy semantics Software EngineerCoding | Medium | Aug 7, 2025 |
| Contrast TCP vs UDP; detect loss Software EngineerCoding | Medium | Aug 7, 2025 |
| Compare write-back vs write-through caches Software EngineerCoding | Medium | Aug 7, 2025 |
| Compare final, finally, finalize Software EngineerCoding | Medium | Aug 7, 2025 |
| Assess HashMap vs ConcurrentHashMap Software EngineerCoding | Medium | Aug 7, 2025 |
| Write conditional aggregation SQL queries Data Scientist | Medium | Aug 4, 2025 |
| Detect credit-card transaction fraud Data ScientistSystem Design | Hard | Aug 4, 2025 |
| Design elevator scheduling algorithm Data ScientistSystem Design | Medium | Aug 4, 2025 |
| Resolve Conflicts in Data Science Leadership Scenarios Data ScientistBehavioral | Medium | Aug 4, 2025 |
| Influence Stakeholders Without Authority: Strategies and Examples Data ScientistBehavioral | Medium | Aug 4, 2025 |
| Identify Users with Specific Page Navigation Patterns Data Scientist | Medium | Aug 4, 2025 |
| Identify Unsupervised Techniques for Detecting Fraudulent Transactions Data Scientist | Medium | Aug 4, 2025 |
| Identify Session with Maximum Overlapping Sessions Count Data Scientist | Medium | Aug 4, 2025 |
| Generate Bigrams Using Python List Comprehension and Zip Data ScientistCoding | Medium | Aug 4, 2025 |
| Explain Window Functions and Joins in SQL and Python Data Scientist | Medium | Aug 4, 2025 |
| Explain P-Value and Errors in A/B Testing Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Explain Challenging Project and Decision-Making Process Data ScientistBehavioral | Medium | Aug 4, 2025 |
| Design and Analyze A/B Test for Cashback Program Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Design A/B Test to Measure PayPal Cashback Value Data ScientistProduct Sense | Hard | Aug 4, 2025 |
| Define Success with Contact Syncing for Growth and Evaluation Data ScientistProduct Sense | Hard | Aug 4, 2025 |
| Count Word Frequency and Print Top Three Words Data ScientistCoding | Medium | Aug 4, 2025 |
| Clean and Summarize User Purchase Data Efficiently Data Scientist | Medium | Aug 4, 2025 |
| Calculate Probability of Heads in Coin Flip Experiment Data Scientist | Easy | Aug 4, 2025 |
| Calculate and Find Average Contacts and Sync Percentage Data Scientist | Medium | Aug 4, 2025 |
| Boost User Login Rate: Key Metrics to Monitor Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Analyze Transactions for Risk and Implement Mitigation Strategies Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Analyze Transactions and Classify by Amount in SQL Data Scientist | Medium | Aug 4, 2025 |
| Analyze Success Metrics and Diagnose Crypto Feature Issues Data ScientistProduct Sense | Medium | Aug 4, 2025 |
| Analyze KPI Drop: Immediate Steps for Stakeholder Persuasion Data ScientistBehavioral | Medium | Aug 4, 2025 |
| Write conditional aggregates with CASE WHEN Data Scientist | Medium | Jul 31, 2025 |
| Explain unsupervised fraud and evaluation Data Scientist | Hard | Jul 31, 2025 |
| Explain past experience and role fit Data ScientistBehavioral | Medium | Jul 31, 2025 |
| Design fraud detection from raw transactions Data ScientistSystem Design | Hard | Jul 31, 2025 |
| Design elevator scheduling for small building Data ScientistSystem Design | Medium | Jul 31, 2025 |
| Compare WHERE vs HAVING with aggregates Data Scientist | Medium | Jul 31, 2025 |
| Assess card transactions and plan risk strategy Data ScientistProduct Sense | Hard | Jul 31, 2025 |
| Discuss Project Motivation and Career Goals Software EngineerBehavioral | Medium | Jul 29, 2025 |
| Master A/B Testing: Key Concepts and Methodologies Explained Data ScientistProduct Sense | Medium | Jul 12, 2025 |
| Identify Users with Specific Page Visit Sequence Data Scientist | Medium | Jul 12, 2025 |
| Describe Leading Without Authority in Data Management Data ScientistBehavioral | Medium | Jul 12, 2025 |
| Clean and Analyze User Transactions with Python Functions Data Scientist | Medium | Jul 12, 2025 |
