Interview Questions
Practice the exact questions companies are asking right now.
Questions
10.0k
Companies
520
Updated
08.21.2026
10.0k Questions 520 Companies08.21.2026
PLTCHK
"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"
_The_TaNk_
"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"
ChrisSenior SWE, LinkedIn
"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."
sleepy33
"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."
JakeSenior ML Engineer, Lyft
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
nuggetlord
"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."
CarlosFull Stack, Shopify
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
boba.tea.vibes
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
AndySWE-II, Google
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
couchpotato99
"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."
ShrutiData Engineer, Salesforce
"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."
midnightramen
"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."
BiancaFrontend Eng, Figma
"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."
tambrahm007
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
toa
"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."
Showing 20 results
Role
Hard
Data Scientist LockedDesign and analyze batching algorithm experiment
This question evaluates experiment design and causal inference competencies—covering geo-randomization and spillover control, precise metric specifica...
Analytics & Experimentation
5
0
93 people solved
Oct 13, 2025
Medium
Data ScientistWrite complex SQL on DoorDash data
You are given the following BigQuery-style schema and tiny samples (assume timestamps are UTC; assume promotions.discount_amount is the applied discou...
Data Manipulation (SQL/Python)
1
0
24 people solved
Oct 13, 2025
Hard
Data ScientistFormulate hypotheses and metrics for video-pin ramp
Experiment Design: Increasing Video Pins in Pinterest Home Feed Context Pinterest wants to increase the proportion of video pins in the Home Feed to b...
Analytics & Experimentation
7
0
57 people solved
Oct 13, 2025
Medium
Data ScientistSolve SQL CTR and Python analytics tasks
Part A — SQL: Compute click-through rate (CTR) by pin_format for US new users. New users are those whose signup_date is within 30 days (inclusive) of ...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistFind top video category by average time
You are given a pandas DataFrame 'pins' with columns [pin_id:int, category_id:int, time_spent_sec:float, pin_format:string] and a dict 'category_map' ...
Data Manipulation (SQL/Python)
1
0
6 people solved
Oct 13, 2025
Medium
Data ScientistDesign SQL cleaning, mapping, dedupe, and keying
Assume PostgreSQL 15. You may choose a different SQL dialect if you clearly state it and adapt syntax accordingly. Schema and small sample data: - Tab...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistPerform and justify t-tests
A/B Test: Compare Mean Watch Time Between Variants A and B Context: You ran an A/B test measuring per-user daily watch_time (in seconds). You obtained...
Statistics & Math
3
0
43 people solved
Oct 13, 2025
Medium
Data ScientistDecide whether to invest in R&D
Should we invest now in a Vegan burger? Build a decision narrative Context Assume you are the owner of a 100‑location fast‑casual burger chain evaluat...
Behavioral & Leadership
3
0
41 people solved
Oct 13, 2025
Medium
Data ScientistMaintain profit margin with new product line
Year 2 volume needed to maintain Year 1 profit margin after adding Vegan line Context - m denotes million dollars. - In Year 2, you add a Vegan burger...
Statistics & Math
2
0
44 people solved
Oct 13, 2025
Medium
Data ScientistImplement rotated array binary search with duplicates
Given an integer array nums that is a non-decreasing array rotated an unknown number of times. Duplicates may exist. Implement a function that returns...
Coding & Algorithms
6
0
68 people solved
Oct 13, 2025
Hard
Data ScientistDesign a fintech homepage ranker
Personalized Product Ranking for a Fintech Home Page — End-to-End Design Context You are designing a personalized ranking system for a fintech app’s h...
Machine Learning
3
0
58 people solved
Oct 13, 2025
Medium
Data ScientistCompute fraud probabilities with Bayes and Binomial
Fake-Account Detection with Binomial Sessions and Bayes Updating You are evaluating a rules-based detector for fake accounts on an online platform. Ea...
Statistics & Math
10
2
92 people solved
Oct 13, 2025
Hard
Data ScientistResolve exclusion, learn fast, and manage conflict
Behavioral & Leadership Onsite — Cross-Team Inclusion, Fast Learning, Analytical Conflict Context You are a data scientist working cross-functionally ...
Behavioral & Leadership
5
0
44 people solved
Oct 13, 2025
Hard
Data Scientist LockedDesign and justify unread-account pinning experiment
This question evaluates a data scientist's competency in experimental design, causal inference, metric definition, instrumentation, and analysis for p...
Analytics & Experimentation
1
0
24 people solved
Oct 13, 2025
Medium
Data ScientistCompute multi-account actives and unread coverage
You have two tables. Table: notifications +--------+------------+------------+-------------------+--------+ | userid | ds | time | notification_type |...
Data Manipulation (SQL/Python)
4
0
39 people solved
Oct 13, 2025
Medium
Data ScientistDifferentiate LDA and QDA; compute boundary
Binary Gaussian Classification: LDA vs QDA You are modeling a 2D binary Gaussian classifier with features (x, y): - Class 0: mean μ0 = (0, 0), covaria...
Statistics & Math
6
0
47 people solved
Oct 13, 2025
Medium
Data ScientistOptimize threshold using confusion matrix and costs
Calibrated Classifier on an Imbalanced Dataset (1% positives) You have a perfectly calibrated binary classifier evaluated on 10,000 held-out examples....
Statistics & Math
7
0
71 people solved
Oct 13, 2025
Medium
Data ScientistDerive L1 vs L2 effects with correlation
Multicollinearity: Ridge vs LASSO vs Elastic Net Setup - Two standardized predictors x1 and x2 with corr(x1, x2) = 0.99. - X'X = [[100, 99], [99, 100]...
Statistics & Math
5
0
67 people solved
Oct 13, 2025
Medium
Data ScientistCompute feed ad frequency and retention in SQL
Assume today is 2025-09-01. Schema and tiny samples: feed_impressions(impression_id, user_id, impression_time, content_type, feed_position, session_id...
Data Manipulation (SQL/Python)
7
0
60 people solved
Oct 13, 2025
Medium
Data ScientistCompute monthly new subscribers and YoY deltas
Write a single SQL query that returns monthly counts of new subscribers starting at 2019-06, plus year-over-year (same-month prior year) comparisons. ...
Data Manipulation (SQL/Python)
0
0
7 people solved
Oct 13, 2025