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 ScientistSolve drunk-passenger probability and simulate outcome
Lost Boarding Pass Puzzle: Last Passenger's Seat Context: Technical screen for a Data Scientist (Statistics & Math). Setup - There are n passengers la...
Statistics & Math
17
0
174 people solved
Oct 13, 2025
Hard
Data ScientistHandle PM Ambiguity and Drive Outcomes
Behavioral + Incident Response Interview Prompt Part A — Leadership Under Ambiguity Tell me about a time a PM dominated a discussion with ambiguous go...
Behavioral & Leadership
4
0
32 people solved
Oct 13, 2025
Hard
Data ScientistDesign a News Feed with APIs
Personalized News Feed System Design (Push + Pull) Context You are designing a large-scale personalized news feed for a consumer application. The feed...
Machine Learning
3
0
58 people solved
Oct 13, 2025
Medium
Data ScientistSegment 500k users into three groups
Churn-Risk Segmentation to Maximize Expected 90-Day Revenue You must segment 500,000 users into three contiguous groups along a churn-risk score, orde...
Analytics & Experimentation
3
0
56 people solved
Oct 13, 2025
Hard
Data ScientistDiagnose rising delivery cost precisely
Problem: Delivery Cost per Order Increased — Design an Analysis Plan Context A restaurant reports a significant increase in delivery cost per order in...
Analytics & Experimentation
7
0
49 people solved
Oct 13, 2025
Hard
Data ScientistDesign a hierarchical MF delinquency forecasting system
Forecasting 90+ Day Delinquency Rates for Multifamily Loans: Hierarchical, Leakage-Safe System Design Context You need to forecast 90+ day delinquency...
Machine Learning
4
0
60 people solved
Oct 13, 2025
Medium
Data Scientist LockedDesign profitability growth plan
This question evaluates a data scientist's skills in business analytics, experimentation design, and strategic framework development for profitability...
Analytics & Experimentation
3
0
41 people solved
Oct 13, 2025
Hard
Data ScientistExplain life story, project leadership, and negotiation
Behavioral & Leadership — HR Screen (Data Scientist) In a single, structured answer, address all items below with specific dates, names, and quantifie...
Behavioral & Leadership
9
0
78 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute and correct correlation significance inflation
This question evaluates statistical inference for correlations, multiple testing control (false discovery rate), power and sample-size calculations, a...
Statistics & Math
3
0
40 people solved
Oct 13, 2025
Hard
Data ScientistDesign a production face recognition system
Design an On-Device Face Recognition System for Mobile Access Control Context You are designing a face-based access control system for mobile devices ...
Machine Learning
4
0
71 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate motivation, feedback, and prioritization
Behavioral & Leadership STAR Prompts (Data Scientist — Technical Screen) Context: You are preparing for a Data Scientist technical screen at Atlassian...
Behavioral & Leadership
7
0
71 people solved
Oct 13, 2025
Hard
Data ScientistDesign an experiment with marketplace network effects
Causal Experiment Design for a Two‑Sided Marketplace with Interference You are designing a causal experiment for a new networked product in a two‑side...
Analytics & Experimentation
7
0
76 people solved
Oct 13, 2025
Hard
Data ScientistApply Double ML with text-address features
Estimate the ATE of a First Reminder on CSAT via Double Machine Learning (DML) Context You have observational data on customer satisfaction (CSAT) sur...
Machine Learning
7
0
58 people solved
Oct 13, 2025
Medium
Data Scientist LockedBuild a leak-free sklearn pipeline
This question evaluates a candidate's ability to construct a leak-free scikit-learn pipeline encompassing column-wise preprocessing, imbalanced binary...
Machine Learning
9
0
79 people solved
Oct 13, 2025
Medium
Data ScientistExplain AUC, activations, ensembles, and imbalance
Machine Learning Metrics and Modeling Choices — Multi-part You are given model scores and binary labels for a small dataset and asked to compute ROC A...
Machine Learning
16
0
115 people solved
Oct 13, 2025
Hard
Data ScientistSenior+ LockedDesign fraud detection across channels with unknowns
This question evaluates a data scientist's competence in designing and operationalizing multi-channel fraud detection systems, covering cost-sensitive...
Machine Learning
5
0
43 people solved
Oct 13, 2025
Medium
Data ScientistImplement scalable prime generator
Write a function first_n_primes(n) that returns the first n prime numbers in ascending order. Constraints: - 1 ≤ n ≤ 100,000. - Aim for O(n log log n)...
Coding & Algorithms
4
0
55 people solved
Oct 13, 2025
Hard
Data ScientistExplain a favorite model end-to-end
Predictive Model Deep-Dive (End-to-End) Pick one predictive model you know deeply (e.g., logistic regression, gradient-boosted trees, transformer clas...
Machine Learning
4
0
62 people solved
Oct 13, 2025
Medium
Data ScientistFix dash dates and aggregate watch time
You receive a CSV of ad viewing logs where the date column repeats only on the first row of each block and subsequent rows use a single dash '-' to in...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data ScientistMaintain target margin with fixed costs
Target Profit Margin With a Mixed-Product Portfolio Context You sell two burger products (classic and vegan) at the same price but with different unit...
Statistics & Math
3
0
46 people solved
Oct 13, 2025