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 EngineerImplement a nested object validator
Implement a helper function validate(object, required_style) that checks whether a possibly nested object matches a provided schema. The object may co...
Data Manipulation (SQL/Python)
16
0
230 people solved
Sep 6, 2025
Medium
Software EngineerDesign a persistent key-value store
Design and implement an in-memory key-value store with a 'medium' layer that serializes the store to bytes for persistence. Provide four functions: se...
Coding & Algorithms
36
0
435 people solved
Sep 6, 2025
Hard
Backend EngineerNew Grad LockedDetermine If One Binary Tree Is a Substructure of Another
This question evaluates practical tree traversal skills and the ability to implement structural matching between two binary trees. It tests recursive ...
Coding & Algorithms
0
1
15 people solved
Jun 15, 2026
Medium
Software EngineerNew Grad LockedMinimum Bills and Coins to Make Change
This question tests a candidate's grasp of greedy algorithms applied to a classic coin-change problem with fixed denominations. It evaluates practical...
Coding & Algorithms
1
0
12 people solved
Jun 15, 2026
Medium
Software EngineerDesign real-time modules communication and overload handling
You are designing a real-time system running on a single machine with two modules (e.g., producer -> consumer) that must communicate with low latency....
System Design
3
0
40 people solved
Feb 6, 2026
Easy
Software EngineerDesign an Attendance Payroll Service
Design the backend service for an employee attendance system. The service should support: - Employees clocking in and clocking out. - Computing each e...
System Design
2
0
35 people solved
Apr 26, 2026
Easy
Software EngineerSpell Out a Nonnegative Integer
Given a nonnegative integer, return its English words representation. Implement a function that handles numbers from 0 through 2,147,483,647 inclusive...
Coding & Algorithms
0
0
11 people solved
Apr 26, 2026
Medium
Machine Learning Engineer LockedDesign a pin search engine
Design a Pinterest-style pin search engine with hybrid candidate generation, dual-encoder retrieval, multimodal ranking, pairwise/listwise losses, off...
ML System Design
4
0
82 people solved
Apr 9, 2025
Hard
Data Scientist LockedDesign a Homepage Store Recommender
This question evaluates system-level machine learning and recommender competencies, including candidate retrieval, filtering and ranking, feature-stor...
Machine Learning
21
0
226 people solved
Mar 15, 2026
Medium
Software EngineerCompute top three scores per student
Compute top three scores per student You are given a list of (student_id, score) records. Return, for each student, their highest three scores in desc...
Coding & Algorithms
8
0
88 people solved
Aug 9, 2025
Hard
Data ScientistCompute Heavy-Caller Percentages
You are given two tables that track voice calls and daily active users for a messaging app. Table: call_events - call_id BIGINT — unique call identifi...
Data Manipulation (SQL/Python)
7
0
62 people solved
Jan 2, 2026
Hard
Data ScientistInterpret p-values and common pitfalls
In a Fraud Data Science interview, you are asked “some p-value questions.” Answer the following in a fraud/experimentation context: 1) Define a p-valu...
Statistics & Math
6
0
60 people solved
Jan 2, 2026
Hard
Data ScientistExplain fraud types and evaluate a fraud model
You are interviewing for a Fraud Data Scientist role at PayPal. Answer the following: 1) List common fraud types relevant to payments (e.g., account t...
Machine Learning
4
0
95 people solved
Jan 2, 2026
Medium
Data ScientistDiagnose Cold Food Deliveries with Key Metrics Analysis
Diagnose Cold Food Deliveries and Test a Fix A food-delivery platform is receiving a spike in customer complaints that delivered meals arrive cold. Yo...
Analytics & Experimentation
44
0
208 people solved
Jul 12, 2025
Hard
Machine Learning Engineer LockedCount Islands in a Grid
This question evaluates skills in graph traversal and grid connectivity detection, testing competency in reasoning about adjacency, state management, ...
Coding & Algorithms
2
0
26 people solved
Mar 14, 2026
Medium
Data ScientistSenior+ LockedHow would you measure impact?
This question evaluates competency in causal inference and experimental design for production analytics, covering delayed outcomes, interference, conf...
Analytics & Experimentation
4
0
55 people solved
Mar 14, 2026
Medium
Data ScientistSenior+ LockedWhy does the CLT matter?
The question evaluates a candidate's understanding of the Central Limit Theorem and related competencies in probabilistic reasoning, estimation, and c...
Statistics & Math
5
0
49 people solved
Mar 14, 2026
Medium
Software EngineerDesign a Retrieval-Augmented Generation (RAG) System
Design a retrieval-augmented generation (RAG) system for a production question-answering product. Users ask natural-language questions, and the system...
ML System Design
2
0
34 people solved
Aug 7, 2025
Medium
Software EngineerDemonstrate project impact and teach something
In a hiring-manager or behavioral interview: 1. Pick one recent project and explain: - the problem and why it mattered, - your role and scope, ...
Behavioral & Leadership
14
0
100 people solved
Feb 4, 2026
Hard
Software EngineerFind final URL by crawling until “congrats”
You are given a starting HTTP URL. Implement a function that repeatedly calls URLs returned by previous responses until you reach a response that indi...
Coding & Algorithms
52
0
382 people solved
Feb 4, 2026