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 ScientistSenior+How would you mentor junior teammates?
Question You are interviewing for a senior-level data science role at DoorDash. The interviewer asks: > As a senior, how would you mentor others (espe...
Behavioral & Leadership
16
0
122 people solved
Feb 28, 2026
Medium
Software EngineerExplain a promotion and key project impact
You’re discussing your resume with an interviewer. - Describe a recent promotion (or strong performance review): what changed in scope/expectations, a...
Behavioral & Leadership
4
0
68 people solved
Feb 28, 2026
Easy
Software EngineerHandle payment-service outages
You own a service that computes courier payouts and then submits payout requests to a downstream payment processor. What should your system do if the ...
Software Engineering Fundamentals
12
0
194 people solved
Jan 28, 2026
Hard
Software EngineerDesign a scalable tagging system
Design a scalable, multi-tenant tagging system that lets users attach multiple tags to arbitrary resources ("items") and query them efficiently. The s...
System Design
25
0
195 people solved
Aug 4, 2025
Medium
Software EngineerFind LCA in organization tree
Find LCA in organization tree Given an organizational hierarchy tree, return the lowest common organization (parent node) for two or more employees (≥...
Coding & Algorithms
13
1
98 people solved
Aug 4, 2025
Hard
Software EngineerDesign an in-memory database
Design an in-memory database System Design: In-Memory Database Engine (Single-Node Core, Scale-Out Aware) Context Design the core of an in-memory, sin...
System Design
32
0
393 people solved
Aug 4, 2025
Hard
Software EngineerDesign a Cryptocurrency Trading System with Third-Party Exchanges
Design a Cryptocurrency Trading System with Third-Party Exchanges Design a cryptocurrency trading platform that routes client orders to one or more th...
System Design
29
0
238 people solved
Aug 4, 2025
Hard
Data ScientistIntern LockedMerge two sorted linked lists
This question evaluates proficiency with linked list data structures, pointer manipulation, in-place merging concepts, and algorithmic efficiency with...
Coding & Algorithms
4
0
52 people solved
Apr 2, 2026
Medium
Software EngineerIntern LockedValidate Bracket Sequence
This question evaluates proficiency with stack data structures, string parsing and matching logic, and the ability to reason about algorithmic time an...
Coding & Algorithms
2
0
22 people solved
Apr 2, 2026
Easy
Data ScientistCalculate Annual Profit of Credit Card Portfolio
Credit Card Portfolio Annual Profit You manage a portfolio of 500,000 active credit-card accounts. Each active card generates multiple revenue streams...
Statistics & Math
25
0
110 people solved
Jul 12, 2025
Hard
Data ScientistPredicting Stock Prices from Twitter Data
Predicting Stock Prices from Twitter Data Suppose you have access to a large stream of Twitter data — tweets with their text, timestamps, and author m...
ML System Design
5
0
37 people solved
Dec 2, 2025
Medium
Software Engineer LockedImplement a Task Processor
This question evaluates understanding of priority-based scheduling and dependency resolution, focusing on data structures and graph-ordering concepts ...
Coding & Algorithms
30
0
259 people solved
Feb 27, 2026
Easy
Machine Learning EngineerSenior+ LockedDesign an Online Coding Judge
This question evaluates system design and scalability skills for building a high-throughput, low-latency online coding judge, covering distributed arc...
System Design
2
0
43 people solved
Feb 27, 2026
Easy
Software EngineerAdd Two Signed Decimal Character Arrays
Add Two Signed Decimal Character Arrays Add two signed decimal integers supplied as strings without converting the complete inputs to built-in integer...
Coding & Algorithms
0
0
2 people solved
May 9, 2026
Hard
Software Engineer LockedDesign a High-Availability Load Balancer
This question evaluates knowledge of distributed systems and load balancing principles, covering high-availability architecture for HTTP/HTTPS traffic...
System Design
19
0
187 people solved
May 9, 2026
Medium
Software Engineer LockedLeaf Domain Cumulative Scores
This question evaluates a candidate's ability to model hierarchical string data and aggregate values along a tree structure, a common pattern in codin...
Coding & Algorithms
1
0
12 people solved
Jun 23, 2026
Medium
Software EngineerThe Celebrity Problem
The Celebrity Problem At a party there are n people, labeled 0 to n - 1. Among them there may be exactly one celebrity — a person who satisfies both o...
Coding & Algorithms
2
0
9 people solved
Jun 23, 2026
Medium
Software Engineer LockedImplement Server Number Allocation
This question evaluates the ability to design efficient stateful data structures and algorithms for resource allocation, focusing on management of per...
Coding & Algorithms
2
0
20 people solved
Apr 1, 2026
Medium
Software EngineerSenior+ LockedDesign AI-Powered Document Search
This question evaluates system-design and machine-learning engineering skills for building a scalable AI-enabled document ingestion pipeline, covering...
ML System Design
3
1
60 people solved
Apr 1, 2026
Easy
Frontend Engineer LockedWhich CSS function supports opacity?
This question evaluates a candidate's understanding of CSS color functions and opacity handling, specifically familiarity with color channel values an...
Software Engineering Fundamentals
8
0
68 people solved
Apr 1, 2026