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
Machine Learning Engineer AIBuild an Ollama Eval Harness
Design and implement a lightweight evaluation harness for a language model served locally through Ollama. The harness should: - Read a dataset of eval...
ML System Design
19
0
181 people solved
Mar 19, 2026
Medium
Frontend EngineerDesign a ChatGPT Playground
Design a web-based AI playground — a prompt-testing console similar to the OpenAI / ChatGPT Playground. A signed-in user types a prompt, picks a model...
System Design
25
0
217 people solved
Apr 25, 2026
Hard
Software EngineerDesign an ad frequency capping system
Design a real-time ad frequency capping system for an ads platform. When the ad server is deciding whether to show an ad to a user, it must enforce ca...
System Design
206
0
1616 people solved
Mar 9, 2026
Hard
Machine Learning Engineer LockedBias-Variance Tradeoff and Vanishing Gradients in Feedforward Networks
This question evaluates conceptual understanding of the bias-variance tradeoff and the vanishing-gradient problem in deep feedforward networks, two co...
Machine Learning
8
0
117 people solved
Jun 12, 2026
Medium
Software EngineerSenior+Design an Ad Assignment API
Design an HTTP API that exposes an ad-assignment function as a production service. The underlying function is given a user, a list of browser position...
System Design
34
0
287 people solved
Apr 13, 2026
Hard
Software EngineerDesign a Cloud DevBox Platform
Design a cloud DevBox platform: a service that gives developers disposable or persistent remote development machines, accessible through a browser, SS...
System Design
57
0
477 people solved
Apr 20, 2026
Hard
Software EngineerDesign a low-latency trading system
System Design: Low-Latency Electronic Trading Platform (Equities) You are designing a single-region electronic trading platform (exchange/ATS-like) th...
System Design
109
0
1141 people solved
Aug 9, 2025
Medium
Data Scientist LockedDefine Churn and Design Onboarding Experiment
This question evaluates the ability to define and operationalize churn metrics and design rigorous controlled experiments for onboarding flows, includ...
Analytics & Experimentation
10
0
79 people solved
May 29, 2026
Medium
Software EngineerDesign a Thread-Safe Shared Counter
Design and implement a per-key call counter: a component that tracks how many times each distinct key has been seen. The API is a single method, for e...
Software Engineering Fundamentals
24
1
368 people solved
Mar 7, 2026
Medium
Data ScientistAssess Routing Experiment Validity
A ride-hailing team runs an A/B test in San Francisco in July 2024 for a new routing algorithm intended to reduce time to pickup, abbreviated TTP. You...
Statistics & Math
32
0
255 people solved
Mar 7, 2026
Medium
Software EngineerAdd Dramatic Punctuation to Text
Add Dramatic Punctuation to Text Implement add_drama(text). Preserve all whitespace exactly. For each maximal non-whitespace token, first replace ever...
Coding & Algorithms
3
0
30 people solved
Jul 27, 2026
Hard
Machine Learning Engineer LockedFind A Low-Quality Annotator From Label Data
Practice a pandas-style data analysis prompt for identifying a low-quality annotator from label data. The question emphasizes cleaning, agreement or g...
Data Manipulation (SQL/Python)
5
0
60 people solved
Jun 2, 2026
Hard
Software EngineerFind the Probability That the Three Smallest Dice Sum to Three
Roll four independent fair six-sided dice. Sort the four results and sum the three smallest values. What is the probability that this sum equals 3? De...
Statistics & Math
1
0
16 people solved
May 24, 2026
Medium
Data Scientist LockedCommuter Ride-Choice Probability: Committed and Permanent Riders
This question tests a data scientist's ability to apply probability theory to multi-event, multi-day behavioral models, covering independence, complem...
Statistics & Math
8
1
60 people solved
Jun 6, 2026
Easy
Software EngineerDesign a restaurant reservation system
Problem Design a restaurant reservation system similar to common booking products. The system should allow customers to search availability and book t...
System Design
18
0
215 people solved
Nov 7, 2025
Medium
Software EngineerGroup Events by an Ordered Attribute List
Group Events by an Ordered Attribute List Problem Implement groupEventCounts(fieldNames, events, groupBy) -> resultJson. Each row in events is a porta...
Coding & Algorithms
2
0
19 people solved
May 11, 2026
Medium
Data ScientistDesign a Real-vs-Fake DNA Classifier
Question You are given DNA sequences over the alphabet {A, C, G, T}, where sequence lengths may vary. You have: - a small labeled dataset containing b...
Machine Learning
18
0
311 people solved
Jan 27, 2026
Medium
Software Engineer LockedSliding Window Average After Dropping the Largest Values
Compute one average per fixed-size sliding window after removing exactly the largest k values, counting duplicates separately. Support negative number...
Coding & Algorithms
19
1
146 people solved
May 23, 2026
Medium
Data Scientist LockedExplain Your Product Motivation and Transferable Experience
Prepare a concise explanation of your product motivation and the experience you would transfer into a data-science role. This behavioral interview que...
Behavioral & Leadership
4
0
33 people solved
May 23, 2026
Medium
Software EngineerSenior+ LockedDesign a Real-Time Chat System
This system design question tests a candidate's ability to architect a scalable real-time messaging platform, focusing on transport protocol selection...
System Design
9
0
87 people solved
Jun 19, 2026