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
Medium
Data ScientistOptimize thresholds under fraud costs
Cost-sensitive Thresholding for Fraud (ATO) Classifier Context You are evaluating a binary classifier for account takeover (ATO) fraud on a large vali...
Statistics & Math
9
0
71 people solved
Oct 13, 2025
Hard
Data Scientist LockedEstimate and validate weights for engagement actions
This question evaluates statistical modeling and inference skills including constrained weighting, uncertainty quantification, multicollinearity and s...
Statistics & Math
4
0
37 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for social feed metrics and ties
You are given the following schema (PostgreSQL) and sample rows. Assume UTC timestamps and that friendships are static over the sample window. users(u...
Data Manipulation (SQL/Python)
2
0
15 people solved
Oct 13, 2025
Hard
Data Scientist LockedDiagnose and reduce cold-food refund costs
This question evaluates data science competencies in analytics, experimentation, and causal inference, including cost modeling, diagnostic analysis, p...
Analytics & Experimentation
5
0
76 people solved
Oct 13, 2025
Hard
Data ScientistRecover causal effect without a control group
Post-hoc Causal Estimation After a Failed A/B Rollout Context An intern accidentally shipped a feature to 100% of eligible users for 5 consecutive day...
Analytics & Experimentation
16
0
104 people solved
Oct 13, 2025
Medium
Data ScientistDiagnose and fix low conversion rigorously
Diagnose a Checkout Conversion Drop After a Promo Banner Launch Scenario Week-over-week, checkout conversion fell from 42% to 35% after a new promo ba...
Analytics & Experimentation
5
0
54 people solved
Oct 13, 2025
Medium
Data ScientistCompute GSP vs VCG payments with reserves
Sponsored Search Auction with Quality Scores and Reserve You are analyzing a single-query auction with 2 ad slots. Position CTR multipliers are [0.10,...
Statistics & Math
6
0
71 people solved
Oct 13, 2025
Hard
Data ScientistDesign real-time payments fraud model under constraints
Real-Time ML Policy Design: Prevent Unauthorized Purchases by Minors Context: You need to reduce unauthorized purchases by minors using their parents'...
Machine Learning
15
0
103 people solved
Oct 13, 2025
Hard
Data ScientistDesign real-time live-stream recommendations
Design a Real-Time Recommendation System for Live Streams Context: You are designing a recommender for a large live-streaming platform. Assume you hav...
Machine Learning
5
0
52 people solved
Oct 13, 2025
Medium
Data ScientistExplain motivation and behavioral principles
Behavioral & Leadership — Data Scientist Technical Screen Instructions Provide specific, first-person examples with quantifiable outcomes and the conc...
Behavioral & Leadership
3
0
37 people solved
Oct 13, 2025
Medium
Data ScientistChoose and compute correct t-test
A/B Test: Watch Time per Impression (seconds) You ran an experiment with two independent groups and want to assess whether the new experience increase...
Statistics & Math
1
0
34 people solved
Oct 13, 2025
Hard
Data ScientistDesign and analyze ads A/B test this week
Experiment Test Plan: Ad Scheduling Policy B vs A Context - Objective: Evaluate a new ad scheduling policy (B) against status quo (A). - Readout windo...
Analytics & Experimentation
3
0
42 people solved
Oct 13, 2025
Easy
Data Scientist LockedCalculate Year-1 profit margin
This question evaluates a candidate's ability to perform applied financial math, including profit margin calculation, classification of costs into fix...
Statistics & Math
5
0
44 people solved
Oct 13, 2025
Medium
Data ScientistInterpret p=0.10 rigorously
A/B Test on Monthly Churn: Inference, Power, and Testing Choices You ran a 28-day A/B test to reduce monthly churn among subscribers, randomizing 150,...
Statistics & Math
3
0
37 people solved
Oct 13, 2025
Medium
Data ScientistDecide goal under ambiguity
Choose the Primary Goal for a New Subscriber-Only Benefit You are the PM/data lead for a subscription product planning a new subscriber-only benefit. ...
Behavioral & Leadership
3
0
37 people solved
Oct 13, 2025
Medium
Data ScientistAlign with PM on ranking goals
Stakeholder Alignment and De-risking a Home Page Product Ranking Initiative Context You are a data scientist asked by a PM to "rank products on the ho...
Behavioral & Leadership
6
0
66 people solved
Oct 13, 2025
Medium
Data ScientistLearn complex topic fast under deadline
Behavioral Prompt: Rapid Ramp-Up on a New Analytical Framework You had to learn a new analytical framework in under a week to deliver a high-stakes re...
Behavioral & Leadership
2
0
25 people solved
Oct 13, 2025
Hard
Data ScientistResolve teammate feeling unwelcome with measurable steps
Behavioral Scenario: Psychological Safety Concern Within a Subgroup You are a senior individual contributor or team lead on a remote-first data team. ...
Behavioral & Leadership
6
0
52 people solved
Oct 13, 2025
Medium
Data ScientistCompute multi-account activity and unread percentages in SQL
You are given two tables. Use them as the source of truth and do not assume any other data. Table: notifications +--------+------------+------------+-...
Data Manipulation (SQL/Python)
2
0
26 people solved
Oct 13, 2025
Hard
Data ScientistBuild ETA prediction and simulate impact
Predicting Delivery ETA (Minutes) Context You are given a take-home dataset with order-, store-, and dasher-level features. The goal is to predict del...
Machine Learning
15
0
170 people solved
Oct 13, 2025