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.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"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."
Evaluate Auto-Play Impact with Key Metrics and Experiment Design
Evaluate Auto-Play Impact With Metrics and Experiment Design A streaming platform is considering auto-playing the next episode to improve engagement. ...
Optimize Email Strategy for New Prime Video Series Launch
Scenario Designing, deploying, and evaluating ranking models and marketing emails for Prime Video. Question How would you approach sending marketing e...
Design Experiment to Measure Shopping Feature Impact
Experiment Design: Measure Instagram Shopping Impact Instagram is launching an in-app Shopping feature, such as product tags, shop surfaces, or in-app...
Track Key Metrics for Apple's New Phone Launch
Product Analytics Scenario: Launch Dashboard Context You are a data scientist at a short-form video/social platform. Apple has launched a new phone an...
Engineer Features to Enhance Smartphone Battery Life Prediction
Battery Life Prediction with Sparse History You are given sparse discharge traces that record battery percentage over elapsed time for prior usage ses...
Identify Date with Highest Total kWh Consumption Using Pandas
meter_readings +----------+------------+---------------+---------+ | meter_id | timestamp | kwh_consumed | city | +----------+------------+------...
Calculate User Registration Date and 7-Day Retention Rate
user_posts +---------+--------------+-----------+ | user_id | posting_date | num_posts | +---------+--------------+-----------+ | 1 | 2023-01-01...
Consolidate and Rank Global Salaries in USD
employees_us +---------+----------+--------+---------+ | emp_id | name | salary | country | +---------+----------+--------+---------+ | 1 |...
Analyze VR App Usage and Engagement Metrics
vr_usage +---------+------------+---------+------------+----------+ | user_id | date | app_id | session_id | duration | +---------+------------...
Compute churn with re-subscriptions
You are analyzing a free-month subscription experiment. Assume experiment eligibility has already been computed; every user in the experiment table is...
Handle merchant complaint about excessive demand
Handle a Merchant Complaint About Excessive Demand A merchant complains that DoorDash is sending more demand than their store can handle. They say the...
Test whether two distributions differ
You have two datasets collected from different systems or populations, and you want to determine whether they come from the same distribution. Explain...
Present Piracy Trends to a PM
You ran the analyses above and got two preliminary findings: - the monthly pirated-theme usage rate appears to rise from 0% to 100% over the observed ...
SQL Queries and Analysis on Bad Advertisers
Scenario You are on the analytics team at TikTok and need to analyze the presence of bad content in ads and identify problematic advertisers. Question...
[Analytics Reasoning] Impact of Malicious Accounts on Meta
You are analyzing malicious accounts on a large social network. Assume: - 1% of all accounts are malicious. - Malicious accounts send friend requests ...
How would you A/B test first trade rate?
Coinbase wants to increase the rate at which newly signed-up retail users place their first trade. Design an A/B test for a product change intended to...
Derive a CDF from a PDF
During a first-round Data Scientist interview, you are asked a coding-and-statistics question: You are given a valid probability density function f(x)...
Solve matrix add, frequency count, longest consecutive
You are asked to solve the following 3 coding tasks (in any language). Implement each as a function. 1) Add two matrices Input: Two 2D integer arrays ...
Solve quantitative word and algebra problems
Quantitative Mini-Problems (Independent) Solve each problem independently. Show your setup clearly. Use standard unit conversions and give exact value...
How would you measure Group Call success?
You are interviewing for a Data Scientist role at a social communication product similar to Meta. The team asks you to evaluate a Group Call feature t...