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
Software Engineer LockedFind Optimal Property Combination
This question evaluates combinatorial optimization and algorithmic problem-solving skills, focusing on subset selection under capacity constraints and...
Coding & Algorithms
2
1
53 people solved
May 26, 2026
Medium
Machine Learning EngineerSenior+ LockedDesign Personalized Promotion Recommendations
This question evaluates a candidate's ability to design end-to-end machine learning recommendation systems, covering competencies such as data collect...
ML System Design
2
0
24 people solved
May 26, 2026
Hard
Software EngineerDesign a listing connectivity ingestion service
Scenario You are designing a Connectivity Service that allows external service providers (partners) to create or update listings in your company’s pla...
System Design
5
0
100 people solved
Nov 5, 2025
Hard
Software EngineerDesign a search autocomplete system
Design a Search Autocomplete System Design a planet-scale search autocomplete (type-ahead) service. As a user types into a search box, the service ret...
System Design
17
0
228 people solved
Jul 15, 2025
Medium
Software EngineerExplain Transformers and QKV matrices
Transformer Self-Attention: Q, K, V, Multi-Head, and Positional Encoding You are given a sequence of token embeddings $X$ (sequence length $n$, model ...
Machine Learning
16
0
173 people solved
Jul 15, 2025
Hard
Software EngineerBuild an API aggregator with concurrency and retries
Build an API aggregator with concurrency and retries Build an Aggregation Service with Parallel Calls, Timeouts, Retries, and Observability Context Yo...
System Design
19
0
141 people solved
Jul 15, 2025
Hard
Backend EngineerDesign Webhooks and Metric Aggregation
The interview report described two system design rounds: a webhook delivery platform and a vehicle metrics aggregation system. Constraints & Assumptio...
System Design
15
0
134 people solved
Feb 4, 2025
Easy
Data ScientistFind top countries by population per continent
Table world_population - continent VARCHAR - country VARCHAR - population BIGINT Assume each row is a country’s latest population and (continent, coun...
Data Manipulation (SQL/Python)
4
1
67 people solved
Feb 1, 2026
Easy
Software EngineerRemove Target Values from a Linked List
Given the head of a singly linked list and an integer target, remove every node whose value equals target and return the new head of the list. The tar...
Coding & Algorithms
4
0
55 people solved
Mar 25, 2026
Medium
Software EngineerExplain what happens when you run ls
In Linux, explain the end-to-end flow of what happens when a user types ls in a shell and presses Enter. Include: - What the shell does - How the exec...
Software Engineering Fundamentals
8
0
62 people solved
Feb 1, 2026
Medium
Software Engineer LockedDesign an hourly call-agent scheduler
This question evaluates algorithmic scheduling, capacity planning, and time-windowed resource allocation skills, along with handling practical constra...
Software Engineering Fundamentals
2
0
29 people solved
Feb 1, 2026
Medium
Software EngineerDesign API that aggregates three downstream APIs
You are given three existing HTTP JSON APIs owned by other backend services: - Service A: GET /service-a?user_id={id} → returns basic user profile dat...
System Design
25
0
389 people solved
Nov 4, 2025
Medium
Software Engineer LockedDesign a Scalable Like Counter
This question evaluates a candidate's competence in large-scale system design, covering scalability, high-throughput write handling, read-optimized co...
System Design
7
0
89 people solved
Sep 25, 2025
Medium
Software Engineer4.2 Design a Collaborative Document Editor
Real-time collaborative editing is one of those features that feels magical when it works — and absolutely nightmarish to build from scratch. Google D...
System Design
15
1
184 people solved
Jan 31, 2026
Medium
Data ScientistEvaluating and launching Instagram Stories
Evaluating and Launching Instagram Stories You are evaluating the rollout and impact of Stories, an ephemeral sharing format similar to Snapchat, acro...
Analytics & Experimentation
74
1
277 people solved
Jul 12, 2025
Medium
Data ScientistCompare Logistic Regression and Random Forest in Limited Data Scenarios
Compare Logistic Regression and Random Forest in Limited Data Scenarios You are designing a binary classifier with limited labeled data. The signal ma...
Machine Learning
98
0
265 people solved
Jul 12, 2025
Medium
Data ScientistCalculate Profitability and Evaluate Partnership for Credit Card Portfolio
Calculate Profitability and Evaluate a Partnership for a Credit Card Portfolio You are analyzing a mature credit-card portfolio to assess current prof...
Analytics & Experimentation
100
0
333 people solved
Jul 12, 2025
Easy
Data ScientistCalculate Expected Users Linking Coinbase Wallets
Expected Coinbase Wallet Linking When users sign up for Coinbase, each of the n users is independently prompted to link a crypto wallet. Each user lin...
Statistics & Math
10
0
80 people solved
Jul 12, 2025
Medium
Business Intelligence EngineerIdentify Most Popular First-Watched Movie in Viewing History
MOVIE_VIEWS +------------+--------------------+------------+ | customer_id| title | date | +------------+--------------------+-----...
Data Manipulation (SQL/Python)
6
0
25 people solved
Jul 12, 2025
Medium
Data ScientistBuild a model to predict wine quality
Modeling task: Predict wine quality from a CSV You are given a clean CSV dataset about red wine. The target (dependent) variable is: - quality (intege...
Machine Learning
12
0
138 people solved
Sep 24, 2025