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 ScientistNew Grad LockedCompute CDF from a PDF Function
This question evaluates a candidate's skills in numerical integration, applied numerical methods, and probability/statistics by requiring construction...
Coding & Algorithms
3
0
44 people solved
Apr 30, 2026
Medium
Data ScientistDesign video-ads experiment and handle null results
You are launching a new video-ad format. Design an end-to-end A/B test to evaluate it against the current ad format. Be precise: 1) Define exposure an...
Analytics & Experimentation
4
0
79 people solved
Oct 13, 2025
Hard
Data ScientistSolve the 12-coin balance puzzle
The 12-Coin Counterfeit Puzzle (Three Weighings) You are given 12 visually identical coins. Exactly one of them is counterfeit. The counterfeit coin d...
Statistics & Math
20
0
170 people solved
Oct 13, 2025
Medium
Data ScientistUse pandas to aggregate, pivot, and label
Given two pandas DataFrames, write code to: (1) merge and aggregate revenue; (2) produce a 2x2 pivot; (3) compute per-state counts with value_counts, ...
Data Manipulation (SQL/Python)
8
0
155 people solved
Oct 13, 2025
Hard
Data ScientistDesign and analyze an SBA mini case experiment
Design a 2‑Week Experiment: $100 Credit After ID Verification You are designing a 2‑week pilot in which new accounts receive a $100 credit after ident...
Analytics & Experimentation
5
0
59 people solved
Oct 13, 2025
Medium
Data Scientist LockedDesign Identity & Trust Experiment
This question evaluates a data scientist's experimental design and causal inference skills, specifically A/B testing methodology, metric selection, po...
Analytics & Experimentation
4
0
48 people solved
Jan 21, 2026
Easy
Software EngineerFind Shortest Paths in Road Network
You are reviewing code for a road-network graph. The domain objects are: `java class Location { String name; Location(String name) { this.name...
Coding & Algorithms
2
0
20 people solved
Mar 8, 2026
Medium
Software EngineerExplain how you use AI tools in development
You’re asked about your AI experience in day-to-day software development: - What AI-assisted development tools have you used (e.g., code completion, c...
Software Engineering Fundamentals
7
0
65 people solved
Feb 12, 2026
Hard
Software Engineer LockedDesign a concurrent latency percentile tracker
This question evaluates understanding of concurrent data structures, thread-safety, time-windowed metrics aggregation, and percentile computation for ...
Software Engineering Fundamentals
25
0
357 people solved
Feb 12, 2026
Medium
Machine Learning EngineerWhat are processes vs threads?
Question Explain the difference between multiprocessing and multithreading in the context of building concurrent applications. Cover the following: - ...
Software Engineering Fundamentals
35
0
235 people solved
Feb 12, 2026
Medium
Machine Learning EngineerDescribe projects, conflicts, and tough stakeholders
Manager (HM) behavioral interview prompt You have a 30–45 minute hiring-manager conversation. Expect a discussion centered on your recent work plus a ...
Behavioral & Leadership
5
0
94 people solved
Feb 12, 2026
Medium
Machine Learning Engineer LockedModel an ads ranking system
This question evaluates machine learning modeling, feature engineering, and systems-level ranking competencies for ad selection and monetization, cove...
Machine Learning
10
0
88 people solved
Feb 12, 2026
Medium
Software Engineer LockedDesign an extensible expense rule evaluator
This question evaluates system-design and API/interface skills for rule engines, focusing on data modeling, extensibility, maintainability, and rule/r...
Software Engineering Fundamentals
39
0
472 people solved
Feb 12, 2026
Medium
Software EngineerDescribe a cross-functional project you’re proud of
Describe a project you are most proud of, ideally one that required cross-team (cross-organizational or cross-functional) collaboration. Your answer s...
Behavioral & Leadership
8
0
153 people solved
Feb 12, 2026
Medium
Data EngineerSenior+Defend a Data Pipeline Architecture and Its Trade-offs
Prompt Choose one production data pipeline that you personally designed or substantially changed. Walk through its architecture, the requirements that...
System Design
1
0
17 people solved
Apr 2, 2026
Easy
Software EngineerDesign a Multimodal Training Data Pipeline
Design a backend system for collecting, filtering, and storing training data sent by many clients. Clients upload records that may include large media...
ML System Design
3
0
36 people solved
Apr 2, 2026
Medium
Data Scientist LockedImplement Buffer Parsers and Generic Map Class
This question evaluates proficiency in low-level C++ buffer parsing, memory and pointer management, safe binary deserialization, and template-based ge...
Coding & Algorithms
2
0
45 people solved
Apr 2, 2026
Hard
Data ScientistInvestigate Declining ROI and Propose Effective Solutions
Investigate Declining ROI and Propose Effective Solutions E-commerce Ads Effectiveness and Diagnostics (Analytics & Experimentation) Context You are a...
Analytics & Experimentation
10
0
73 people solved
Aug 4, 2025
Medium
Software EngineerFind linked user records by similarity
You are given a list of user records. Each record has the following fields: - id (integer, unique) - name (string) - email (string) - company (string)...
Coding & Algorithms
8
0
87 people solved
Dec 8, 2025
Medium
Software EngineerImplement run-length encoding and decoding
You are given a string consisting of lowercase English letters. You need to implement run-length encoding (RLE) and its corresponding decoding. 1. Enc...
Coding & Algorithms
44
0
378 people solved
Dec 8, 2025