Data Scientist Interview Questions
Practice 2,964 real Data Scientist interview questions for 2026. Data Scientist interview questions drawn from Meta, Capital One, Amazon, Google, TikTok and similar employers — real questions from actual interviews with detailed solutions — designed to accelerate your interview preparation for product analytics, ML and production data roles. This collection emphasizes the practical skills interviewers test: SQL and data manipulation, experiment design and A/B testing, statistical reasoning, Python coding for data problems, model evaluation and feature engineering, plus machine-learning system tradeoffs and metric design. What’s distinctive about modern data-science loops is the blend of product thinking and reproducible ML: expect hands-on SQL tasks and funnel analysis in screens, deeper experiment-design and causality questions in mid rounds, and coding or modeling challenges plus ML-system discussions in senior loops. Interviewers evaluate problem framing, statistical rigor, and how you communicate decisions to product partners. To prepare, prioritize daily SQL practice (CTEs, window functions), refresh hypothesis-testing and power calculations, rehearse concise metric-driven narratives, and build a few end-to-end model or experiment stories you can explain clearly under time pressure.
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"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Traverse an Org Chart by Level
You are given an organization's reporting structure as a flat list of employee-manager relationships. Exactly one employee is the root (the CEO) and h...
Measure Shopify App Store Success
You are a Data Scientist working on the Shopify App Store, a marketplace that connects Shopify merchants with third-party app developers. Merchants us...
Design experiments for payments, search, and promotions
You are a Data Scientist supporting a consumer marketplace app (users search restaurants and place orders). Answer the following product experimentati...
Answer Amazon Leadership Principle Scenarios
In an Amazon Data Scientist intern virtual interview, answer behavioral questions using the STAR method and tie each story to Amazon Leadership Princi...
Compute Company Suggestion Funnels
An AI workflow suggestion product logs suggestion-related events in a single event table. Table: suggestion_events - event_id STRING: unique event rec...
Compare Two Coin Proportions
You are given results from two independent coin-toss experiments: - Coin A was tossed 100 times and landed heads 40 times. - Coin B was tossed 1,000 t...
Answer Amazon-style behavioral questions
You are interviewing for a role at Amazon and are asked the following behavioral questions. Answer each using the STAR method (Situation, Task, Action...
How would you diagnose a completed orders drop?
Case: Completed orders dropped in Los Angeles You are a Data Scientist supporting a consumer pricing team for a two-sided delivery marketplace (custom...
Implement Integer Square Root
Given a non-negative integer x, implement sqrt(x) and return the integer part of its square root, i.e., floor(sqrt(x)). Requirements: - Do not use a b...
Solve probability and stopping questions
Answer the following independent interview questions: 1. Let X and Y be independent random variables, each distributed Uniform(0,1). Find the probabil...
Design Uber Eats Restaurant Recommendations
Design a restaurant recommendation system for the Uber Eats home page. A user opens the Uber Eats app and should see a ranked feed of restaurants avai...
Diagnose Flight Delays and Burger Launch
You are given two analytics case questions. Part A: Flight delay analysis An airline wants to understand and predict delays. You receive a flight-leve...
Assess Routing Experiment Validity
A ride-hailing team runs an A/B test in San Francisco in July 2024 for a new routing algorithm intended to reduce time to pickup, abbreviated TTP. You...
Should WhatsApp launch group calls?
WhatsApp currently supports only one-to-one calling and is considering launching group calling for personal users. The product goal is to increase eng...
Implement FizzBuzz
Implement the classic FizzBuzz problem. Given a positive integer n, return the sequence from 1 to n as strings with the following rules: - If a number...
Choose Classification Metrics Under Asymmetric Costs
You are evaluating a binary classification model for a business problem. Explain how to use a confusion matrix to compute and interpret: - precision, ...
Design a Homepage Store Recommender
You are designing the homepage store recommendation system for a food-delivery app similar to DoorDash. When a user opens the app, the online request ...
Answer Google Behavioral Questions
Question In a behavioral interview for a Data Scientist role at Google, how would you answer the following questions? A strong answer should be specif...
Calculate Triangle Probability From Broken Stick
A stick of length 1 is broken into three pieces by choosing two cut points independently and uniformly at random along the stick, then sorting the two...
Design experiments for marketplace product changes
You are interviewing for a Data Scientist role at a food-delivery marketplace such as DoorDash. For each scenario below, explain how you would evaluat...