Coinbase Data Scientist Interview Questions
Master your tech interview with our curated database of real questions from top companies.
Diagnose Discrepancy in A/B Test Conversion Rate Results
A/B Test Design: Personalized Marketing Emails and Conversion Lift Scenario An e-commerce firm wants to send personalized marketing emails to increase...
How to Analyze and Model Behavioral Data Effectively?
End-to-End Conversion Modeling on a Raw Behavioral Dataset Scenario You receive a raw, event-level behavioral dataset (e.g., user actions, sessions, m...
Estimate Super Bowl QR Code Scan Rate Using Historical Data
Estimating QR Scan and Sign-up Conversion for a Super Bowl TV Ad Scenario A Super Bowl TV ad prominently features a QR code and a clear call-to-action...
Solve Aptitude Test: Logical, Numerical, Verbal Reasoning
Scenario Pre-employment aptitude screen assessing logical, numerical and verbal reasoning within a strict time limit Question You have 15 minutes to s...
Calculate Adoption and Transaction Rates, Identify Cross-Region Sales
user_txn +---------+-------------+------------+---------------+------------------+---------------------+ | user_id | user_region | adopted_at | transa...
Analyze Factors Behind 20% Retail Revenue Decline
Retail Revenue Decline Analysis Scenario A retailer reports a 20% decline in revenue compared with a prior, comparable period. Assume revenue is net o...
Investigate Anomalies in Coinbase Wallet Engagement Metrics
Coinbase Wallet: Anomaly Investigation Framing Context You observe an unexpected spike or drop in a key Coinbase Wallet metric (e.g., DAU, transaction...
Calculate Probability of Wallet Linking Among Users
Wallet Linking Probability Scenario - There are n users on a platform. - Each user independently links their wallet with probability p (0 ≤ p ≤ 1). - ...
Estimate Successful Sign-ups from Super Bowl QR Code Ad
Estimating Sign-ups from a Super Bowl QR Code Ad Background A cryptocurrency company airs a national Super Bowl commercial featuring a bouncing QR cod...
Diagnose Revenue Decline: Key Analyses and Metrics
Diagnose a Sudden Revenue Drop Scenario A consumer fintech/trading platform (e.g., mobile/web app with transaction-fee revenue) experiences a noticeab...
Calculate Cumulative Sum for Each Integer in Table
numbers +-----+ | num | +-----+ | 1 | | 2 | | 13 | | 14 | | 15 | +-----+ Scenario You have a table containing one integer per row; for each row...
Evaluate Integrity in Workplace Culture Through HR Screening
Workplace Culture & Integrity Survey (HR Screening) Context You are completing an HR screening as part of a Data Scientist take‑home project applicati...
Investigate Super Bowl Ad Impact on User Sign-Ups and Revenue
Estimating QR-Driven Sign-ups and Diagnosing a 20% MoM Retail Revenue Decline Scenario A crypto company runs a Super Bowl commercial featuring a QR co...
Calculate Expected Users Linking Coinbase Wallets
Coinbase Wallet Linking: Bernoulli/Binomial Setup Scenario You have n users, each independently asked to link a Coinbase wallet. Each user links with ...
Build and evaluate a conversion prediction model
Predicting 7-Day Purchase After Email Send Context You are given a CSV where each row is a user–email send (or scheduled send/control), with columns: ...
Compute adoption, latency, and cross-region transactions
Invented schema: users(user_id INT PRIMARY KEY, user_region STRING, adopted_at TIMESTAMP NULL) transactions(txn_id INT PRIMARY KEY, user_id INT, txn_t...
Write SQL: sum values ≤ each row’s value
Given table numbers(id INT PRIMARY KEY, val INT), return for every row the sum of all val across the entire table that are ≤ that row’s val (i.e., com...
Diagnose uplift drop in email A/B tests
Personalized Product Emails Experiment — Design, Sizing, and Debugging Conflicting Reruns Context An e-commerce company plans to A/B test personalized...
Detect sequence rule and repair anomaly
Implement next_value(seq: list[int]) that detects the rule of a numeric sequence and returns a tuple (model_name, parameters, anomaly_index_or_None, n...
Write SQL and Python for funnels/retention
Given the following schema and small samples, answer Parts A–C. Assume timestamps are UTC and "today" is 2025-09-01. Schema: users(id INT, country STR...