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 ScientistSolve the 12-coin balance puzzle
The 12-Coin Counterfeit Puzzle (Three Weighings) You are given 12 visually identical coins. Exactly one of them is counterfeit. The counterfeit coin d...
Statistics & Math
20
0
170 people solved
Oct 13, 2025
Hard
Data ScientistEvaluate concession gift-card policy with DID
Evaluate a Gift-Card Concession Pilot (Causal Impact with Staggered Adoption) Context Several regions piloted a policy: when a shipment is lost or dam...
Analytics & Experimentation
6
0
69 people solved
Oct 13, 2025
Hard
Data ScientistDesign robust A/B test with interference and seasonality
Experiment Design: Redesigned Onboarding with Network Effects and Weekly Seasonality Background You are launching a redesigned onboarding flow for a c...
Analytics & Experimentation
11
0
102 people solved
Oct 13, 2025
Hard
Machine Learning EngineerDesign a low-latency RAG system
Design a Low-Latency RAG System for Customer Support Problem Statement Design a production-grade retrieval-augmented generation (RAG) system that powe...
ML System Design
20
0
270 people solved
Jul 27, 2025
Medium
Data Scientist LockedEvaluate Carousel and Billboard Lift
This question evaluates experiment design, causal inference, metric definition, diagnostic analysis, and measurement validity within the Analytics & E...
Analytics & Experimentation
15
0
123 people solved
Jan 11, 2026
Hard
Software EngineerDetect Currency Arbitrage After a Cycle Fee
Detect Currency Arbitrage After a Cycle Fee You are given a matrix of positive currency exchange rates, where rates[i][j] units of currency j are rece...
Coding & Algorithms
0
0
5 people solved
May 3, 2026
Medium
Software EngineerOrder Classes by Prerequisites with Recursive DFS
Order Classes by Prerequisites with Recursive DFS Implement class_order(classes, prerequisites) using recursive depth-first search. classes contains d...
Coding & Algorithms
1
0
17 people solved
May 3, 2026
Medium
Software Engineer LockedImplement Stable Softmax
This question evaluates understanding of numerical stability, floating-point arithmetic, normalization, and probability distributions when computing s...
Coding & Algorithms
1
0
13 people solved
May 3, 2026
Medium
Data Scientist LockedSolve Probability and Statistics Questions
This question evaluates proficiency in statistical modeling (ordinary least squares linear regression), probability theory (law of large numbers and c...
Machine Learning
6
0
81 people solved
May 3, 2026
Medium
Backend EngineerResolve conflict across teams
Describe a time when you had to coordinate between two teams that were in conflict or seriously misaligned. What caused the disagreement, how did you ...
Behavioral & Leadership
14
0
117 people solved
Feb 18, 2026
Medium
Software EngineerSolve classic troubleshooting & algorithm tasks
Solve classic troubleshooting & algorithm tasks System failure troubleshooting: You can only SSH into the machine and the log file is huge. How would ...
Coding & Algorithms
27
0
207 people solved
Aug 4, 2025
Medium
Machine Learning EngineerDesign Personalized Product Feeds
Design an ML system for personalized product feeds in an e-commerce application. For each user request, the system should return a ranked feed of prod...
ML System Design
9
0
99 people solved
Apr 1, 2026
Medium
Backend EngineerSenior+ LockedDesign a Train Ticket Booking System
This question evaluates a backend engineer's competency in object-oriented design, SOLID principles, API and service design, data modeling, concurrenc...
Software Engineering Fundamentals
3
0
25 people solved
May 20, 2026
Hard
Software Engineer LockedExplain your database experience and debugging approach
This question evaluates a candidate's practical database engineering knowledge, concurrency debugging skills, and ability to integrate and verify AI-a...
Software Engineering Fundamentals
16
0
128 people solved
Feb 4, 2026
Hard
Software EngineerCompute Remaining GPUs With Switching Limits
Suppose you manage n GPU clusters with fixed daily capacities capacity[i]. Each day starts fresh with the full capacity, because all GPUs are returned...
Coding & Algorithms
7
0
45 people solved
Apr 16, 2026
Hard
Data Scientist LockedAssess free-month promotion impact
This question evaluates a data scientist's competency in experimental design, causal inference, metric definition and prioritization, bias identificat...
Analytics & Experimentation
15
0
228 people solved
Jan 22, 2026
Medium
Software Engineer LockedDesign a content moderation system
This question evaluates a candidate's competency in designing large-scale content moderation systems, covering distributed architecture, scalability a...
System Design
7
0
115 people solved
Jan 22, 2026
Hard
Machine Learning EngineerImplement attention and Transformer with backward pass
Implement Scaled Dot-Product Attention and a Transformer Block (No Autograd) Context: Build multi-head self-attention and a Transformer encoder-style ...
Machine Learning
43
0
386 people solved
Aug 12, 2025
Medium
Backend EngineerSenior+ AIDesign Idempotent Due-Date and Hold Notifications
Design Idempotent Due-Date and Hold Notifications Extend a library-management system with two notification workflows: 1. A patron receives a notificat...
System Design
2
0
27 people solved
May 2, 2026
Medium
Machine Learning EngineerExplain CLIP, contrastive losses, and retrieval limits
Answer the following ML questions in the context of multi-modal (text–video/image) retrieval: 1) How does a CLIP-style model work conceptually (archit...
Machine Learning
10
0
123 people solved
Feb 3, 2026