Interview Questions
Practice the exact questions companies are asking right now.
Questions
9.8k
Companies
511
Updated
08.16.2026
9.8k Questions 511 Companies08.16.2026
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
Medium
Data Scientist LockedEstimate first selection round with/without replacement
This question evaluates understanding of probability and expectation concepts, specifically sampling with and without replacement, per-round success p...
Statistics & Math
2
0
43 people solved
Oct 13, 2025
Medium
Data ScientistModel user-level ad impression allocation
Random Assignment of Ad Impressions to Users Context - There are X distinct users and Y ad impressions (X ≥ 1, Y ≥ 0 integers). - Each impression is i...
Statistics & Math
7
0
74 people solved
Oct 13, 2025
Medium
Data ScientistQuantify database bug cost/benefit
Bug Impact on Commission and Admin Costs (Jan–Mar) Context and Assumptions - The company earns commission revenue on user spend; an admin fee is a com...
Statistics & Math
7
0
60 people solved
Oct 13, 2025
Medium
Data ScientistWrite advanced SQL for sales support analytics
Write SQL for the following schema and tasks. Assume ANSI SQL with DATE_TRUNC and INTERVAL supported. Sample tables (minimal rows shown). accounts +--...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistAudit and onboard unfamiliar datasets safely
You inherit unfamiliar hotel search data with sparse documentation. Provide a concrete, ordered checklist to: a) discover tables/columns and verify pr...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL/Python for CTR analytics
Part A — SQL (use the schema and sample data below): Compute 48-hour unique CTR for campaign_id=100 by variant, deduplicating to the earliest send per...
Data Manipulation (SQL/Python)
0
0
4 people solved
Oct 13, 2025
Medium
Data ScientistWrite monthly new-vs-returning requests SQL
Given the schema and sample data below, write a single PostgreSQL query (no dynamic SQL) that returns, for every calendar month present in requests, t...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistWrite complex joins and window functions
You are given a simplified Thumbtack-like marketplace schema in PostgreSQL. Assume UTC timestamps and weeks start on Monday. Treat "today" as 2025-09-...
Data Manipulation (SQL/Python)
0
0
5 people solved
Oct 13, 2025
Medium
Data ScientistCompute shop visibility and intent metrics in SQL
Schema (PostgreSQL). Tables: users(user_id) shops(shop_id, shop_name, merchant_type) posts(post_id, shop_id, is_shoppable BOOLEAN, created_at TIMESTAM...
Data Manipulation (SQL/Python)
0
0
7 people solved
Oct 13, 2025
Medium
Data ScientistChoose group-call participant cap via distribution
Group Call Cap Decision: QoS vs Reach You are deciding whether to cap the maximum number of participants in a group call. You have the past 28-day dis...
Statistics & Math
6
0
44 people solved
Oct 13, 2025
Hard
Data ScientistDesign cluster-randomized test under network effects
A/B Test Design for a New Group Call Feature with Network Effects You are designing an experiment for a Group Call feature where social network effect...
Analytics & Experimentation
7
0
49 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL to infer group-call demand
You are given only 1:1 call logs and a user table. Use SQL to estimate latent demand for a 'Group Call' feature by detecting 10-minute 'call loops' wh...
Data Manipulation (SQL/Python)
1
0
4 people solved
Oct 13, 2025
Medium
Data ScientistTrain and evaluate logistic model with regularization
Binary Classification with Logistic Regression and Regularization Data - Two CSVs: a training set x and a test set x_test. - Each has 7 columns: - C...
Machine Learning
4
0
63 people solved
Oct 13, 2025
Medium
Data ScientistLabel game performance by margin
Given a games DataFrame (or R data.frame) with columns: team_id, opponent_team_id, team_score, opponent_team_score, write code to: (1) Define a functi...
Data Manipulation (SQL/Python)
2
0
18 people solved
Oct 13, 2025
Medium
Data ScientistRank each team’s top 3 scores in 2024
Using the same schema, compute each team’s top 3 highest-scoring games for season_year = 2024, treating each game from BOTH teams’ perspectives (i.e.,...
Data Manipulation (SQL/Python)
0
0
6 people solved
Oct 13, 2025
Medium
Data ScientistFind 2023 NCAA championship winner
You are given two tables. Schema: team(team_id INT PRIMARY KEY, team_name TEXT); game(game_id INT PRIMARY KEY, team_id INT, opponent_team_id INT, date...
Data Manipulation (SQL/Python)
1
0
8 people solved
Oct 13, 2025
Medium
Data ScientistCompute churn metrics and rank top students
You have two tasks. Part A (R): You receive a Customers CSV with columns: id (INT), signup_date (YYYY-MM-DD), last_active_date (YYYY-MM-DD), churned (...
Data Manipulation (SQL/Python)
0
0
4 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for fares and age-band counts
You have two tables. Schema: - drivers(driver_id VARCHAR PRIMARY KEY, name VARCHAR, date_of_birth DATE) - trips(trip_id VARCHAR PRIMARY KEY, driver_id...
Data Manipulation (SQL/Python)
3
1
43 people solved
Oct 13, 2025
Medium
Data ScientistCheck anagrams under real-world constraints
Given two strings s and t, determine whether they contain exactly the same multiset of characters (e.g., 'abc' and 'cab' → true; 'aab' and 'ab' → fals...
Coding & Algorithms
4
0
84 people solved
Oct 13, 2025
Medium
Data ScientistSeparate demand from supply for jeans
Scenario You are a Data Scientist at a multi-category marketplace. The Jeans category is underperforming. You must diagnose whether the primary bottle...
Analytics & Experimentation
3
0
28 people solved
Oct 13, 2025