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
Software EngineerDesign a user behavior monitoring system
System Design: User Behavior Monitoring System You are asked to design a monitoring/analytics system that collects user behavior events from clients (...
System Design
30
1
309 people solved
Dec 4, 2025
Medium
Software EngineerCount Digit-Reversal Equivalent Pairs
Define flipdigits(x) as the integer produced by reversing the decimal digits of non-negative integer x and removing leading zeroes from the reversed r...
Coding & Algorithms
0
0
10 people solved
Jul 2, 2026
Medium
Software EngineerCalculate Completion Time for a Single-Server Reactor Queue
A laboratory has one molecular reactor. Each accepted sample takes exactly 5 minutes to process. Samples arrive throughout the day at integer timestam...
Coding & Algorithms
1
0
14 people solved
Jul 2, 2026
Easy
Data ScientistDesign a pricing experiment with network effects
Scenario You want to launch a new pricing model that incentivizes shoppers to place/pick up more orders during rush hours in a two-sided marketplace (...
Analytics & Experimentation
27
0
203 people solved
Feb 6, 2026
Medium
Backend Engineer LockedCount and Rank Words in a Paragraph
Count case-insensitive ASCII words in a paragraph and return deterministic frequency rankings. Tokenize maximal letter runs, normalize to lowercase, s...
Coding & Algorithms
1
0
12 people solved
Jun 13, 2026
Easy
Software EngineerSolve binary-tree reverse printing and LPS
You are given a binary tree node definition: - TreeNode { int val; TreeNode left; TreeNode right; } Answer the following two algorithmic questions. 1)...
Coding & Algorithms
12
0
137 people solved
Dec 24, 2025
Hard
Software EngineerDesign product catalog service
Design product catalog service Design a product catalog service for a large e-commerce / grocery platform. The catalog must support a hierarchical cat...
System Design
78
0
601 people solved
Aug 4, 2025
Medium
Software EngineerExplain C++ and GPU Tradeoffs
The interview included several short-answer questions, all discussed in C++: 1. Explain how to reason about the output of a C++ program that uses both...
Software Engineering Fundamentals
7
0
67 people solved
Mar 2, 2026
Medium
Software Engineer LockedDesign Real-Time Trending Likes
This question evaluates skills in designing scalable, low-latency real-time analytics systems, covering stream processing, time-windowed aggregations,...
System Design
4
0
33 people solved
May 26, 2026
Medium
Software Engineer LockedExplain PM collaboration and AI code quality
This question evaluates collaboration and leadership competencies in partnering with Product Managers and in managing code quality risks introduced by...
Behavioral & Leadership
1
0
16 people solved
May 26, 2026
Medium
Software EngineerDesign a distributed tree node counter
Design a distributed tree node counter Distributed Tree Node Count with Two Messages You are given an N-ary tree of machines (one process per node). E...
System Design
50
0
459 people solved
Jul 26, 2025
Easy
Data ScientistDerive E[X^2] from mgf e^{t^2}
Identify Distribution and Compute E[X^2] from an MGF You are given a random variable X with moment-generating function (mgf): - M_X(t) = E[e^{tX}] = e...
Statistics & Math
3
0
62 people solved
Oct 13, 2025
Medium
Data ScientistImplement TF–IDF with sparse matrices
Implement TF–IDF from Scratch (Python + NumPy/SciPy) You are given a list of documents (plain strings). Implement a TF–IDF vectorizer from scratch — n...
Coding & Algorithms
15
0
126 people solved
Oct 13, 2025
Hard
Data ScientistEstimate impact of global launch without holdout
Causal Lift Plan After a Global Launch Without a Holdout Background A new product feature was launched globally on 2025-05-10, with no control or hold...
Analytics & Experimentation
28
0
230 people solved
Oct 13, 2025
Medium
Software EngineerSenior+Design User Re-engagement Notifications
Design a re-engagement system for an AI assistant product. The system should support at least two use cases: 1. Send relevant notifications to inactiv...
System Design
9
0
85 people solved
Apr 10, 2026
Medium
Data EngineerExplain impact and partnership
Prepare for a hiring manager interview and a cross-functional partner conversation. Be ready to answer questions such as: - Why do you want to join th...
Behavioral & Leadership
11
0
110 people solved
Apr 10, 2026
Easy
Software EngineerAnswer conflict, tight deadline, and mentorship prompts
Behavioral Interview Prompts Answer the following with specific examples from your experience: 1. Conflict: Tell me about a time you had a conflict wi...
Behavioral & Leadership
13
0
194 people solved
Mar 1, 2026
Hard
Software EngineerImplement multi-head self-attention correctly
Implement Multi-Head Self-Attention (from scratch) Context You are given an input tensor X with shape (batch_size, seq_len, d_model). Implement a mult...
Machine Learning
28
0
347 people solved
Sep 6, 2025
Medium
Software EngineerAnalyze time complexity for dictionary operations
Analyze the time complexity of the following dictionary/hash map operations. (a) Searching for a key: state average-case and worst-case time, and expl...
Coding & Algorithms
11
0
193 people solved
Sep 6, 2025
Medium
Software EngineerDesign receipt system with combo discounts
Question You are building a point-of-sale ordering UI for a food-ordering workflow. You are given class stubs and a callback you must wire up: - Item(...
Coding & Algorithms
15
0
172 people solved
Sep 6, 2025