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
Machine Learning EngineerMaintain a Streaming Median
You are designing a component that receives integers one at a time and must return the current median after each update. Example: - After processing [...
Coding & Algorithms
4
0
34 people solved
Feb 9, 2026
Medium
Software EngineerDesign an in-memory banking system
Implement an in-memory banking system (e.g., in Java) that supports the following operations on user accounts. Assume user IDs are unique strings and ...
Coding & Algorithms
40
1
432 people solved
Feb 9, 2026
Medium
Machine Learning EngineerInternFind pairs with the minimum absolute difference
Given an integer array (not necessarily sorted), find the minimum absolute difference between any two distinct elements. Return all pairs of values th...
Coding & Algorithms
4
0
75 people solved
Feb 9, 2026
Medium
Software Engineer LockedPredict most likely next word from training data
This question evaluates proficiency in frequency-based language modeling and data-structure design, focusing on token sequence analysis, frequency cou...
Coding & Algorithms
12
0
119 people solved
Feb 9, 2026
Medium
Software EngineerFind the Longest Palindromic Substring in Linear Time
Implement longest_palindromic_substring(s) and achieve O(n) time. Return the longest contiguous substring that reads the same forward and backward. If...
Coding & Algorithms
0
0
1 people solved
Apr 28, 2026
Hard
Software EngineerDesign a Synchronized Live Comment Overlay
Design a Synchronized Live Comment Overlay Design a chat-like comment service whose messages appear as a live overlay synchronized to a video or event...
System Design
1
0
12 people solved
Apr 28, 2026
Medium
Machine Learning EngineerSenior+Solve Decimal Coin Change
Given a list of coin denominations represented as decimal values and a target amount represented as a decimal value, return the minimum number of coin...
Coding & Algorithms
1
0
15 people solved
Apr 28, 2026
Easy
Data ScientistWrite SQL for top categories and highly active users
You are given three tables: 1) impression Event-level table of user impressions. - impression_id BIGINT (PK) - user_id BIGINT (FK → user.user_id) - pi...
Data Manipulation (SQL/Python)
58
2
389 people solved
Dec 5, 2025
Medium
Software EngineerFind spammer with minimal hasMessaged calls
Question You have n accounts labeled 0..n-1 and an oracle API: ` boolean hasMessaged(a, b) // true iff account a has sent at least one message to ac...
Coding & Algorithms
17
0
153 people solved
Aug 14, 2025
Medium
Software EngineerDesign synchronization for water molecule assembly
Concurrency: Build H2O from concurrent H and O actions Context You are given two kinds of threads that repeatedly call the following functions: - hydr...
System Design
21
0
153 people solved
Aug 14, 2025
Medium
Software Engineer LockedSolve Three Coding Problems
This set of problems evaluates competencies in streaming data handling and incremental aggregation, time-dependent grid traversal and reachability und...
Coding & Algorithms
2
0
26 people solved
Feb 8, 2026
Medium
Software EngineerImplement ASCII canvas and solve two data problems
Solve the following coding tasks. 1) ASCII Canvas / Printer Implement a small drawing engine for a fixed-size canvas of width = 10 and height = 6. - E...
Coding & Algorithms
5
1
63 people solved
Feb 8, 2026
Medium
Software Engineer LockedCheck if a binary tree is complete
This question evaluates understanding of binary tree properties and traversal techniques, testing competency in data structures and algorithmic reason...
Coding & Algorithms
6
0
48 people solved
Feb 8, 2026
Medium
Software Engineer LockedDesign a cloud-based global property rental platform
This question evaluates skills in cloud-native system architecture, distributed systems design, scalability, security, data modeling, and operational ...
System Design
7
0
71 people solved
Feb 8, 2026
Medium
Machine Learning Engineer LockedCompute sum over consecutive-step subarrays
This question evaluates proficiency in array processing, detection of consecutive-step arithmetic sequences, and accumulation of subarray sums with at...
Coding & Algorithms
10
1
86 people solved
Feb 8, 2026
Easy
Machine Learning Engineer LockedCompute point-to-segment minimum distance
This question evaluates understanding of computational geometry and numerical robustness, testing the ability to compute Euclidean distances between a...
Coding & Algorithms
17
0
168 people solved
Feb 8, 2026
Easy
Backend EngineerDesign an Elevator Control System
Design an object-oriented elevator control system for a building with multiple floors and multiple elevators. The system should support: - Hall reques...
Software Engineering Fundamentals
16
0
140 people solved
Dec 4, 2025
Medium
Machine Learning EngineerWrite SQL to rank top products per category
You are given two tables: products - product_id (int, primary key) - category (string) order_items - order_id (int) - product_id (int) - quantity (int...
Coding & Algorithms
10
1
119 people solved
Dec 4, 2025
Medium
Software EngineerDebug a driver assignment bug
Given a service that selects the best delivery driver ("dasher") for an order, users report incorrect assignments. With a provided codebase and failin...
Coding & Algorithms
41
0
322 people solved
Aug 13, 2025
Medium
Machine Learning EngineerCompare convolutions and transformers
Compare CNNs and Transformers Task Explain the key differences between convolutional neural networks (CNNs) and transformer architectures. Specificall...
Machine Learning
13
0
140 people solved
Aug 13, 2025