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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
18.6k
Companies
980
Updated
11.12.2026
18.6k Questions 980 Companies11.12.2026
PLTCHK testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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."

PLTCHK testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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
Apple logo
Apple
Medium
Software Engineer Locked

Multiply Two Sparse Matrices

Multiply two sparse integer matrices without performing work for known zero contributions. Preprocess nonzero rows, join compatible inner indices, acc...

Coding & Algorithms
8
0
61 people solved
May 14, 2026
Meta logo
Meta
Medium
Software Engineer

Design an online chess platform

Design an online chess platform. Requirements: - User matchmaking (ranked/unranked). - Real-time gameplay with low latency moves. - Enforce game rules...

System DesignMultiplayer Game SystemsSystem Design Fundamentals
8
0
73 people solved
Feb 25, 2026
Affirm logo
Affirm
Medium
Software Engineer Locked

Design an A/B testing platform

This question evaluates the ability to design an end-to-end A/B testing platform, assessing competencies in distributed systems architecture, data mod...

System DesignExperiment Design (A/B Testing)Experiment Analysis & Readout
30
0
271 people solved
Mar 7, 2026
Revolut logo
Revolut
Medium
Product Manager

Launch In-Person Cash Deposits for Revolut Top-Ups, Then Diagnose a Falling KPI

You are a product manager on Revolut's top-up team, the team responsible for the ways customers add money to their accounts. Answer two questions: how...

Product Design & StrategyRequirements & Launch ExecutionMetric Diagnostics
1
0
12 people solved
Oct 17, 2025
Twitch logo
Twitch
Medium
Data Scientist

Write robust SQL for streaming analytics

Write efficient PostgreSQL SQL for the following streaming analytics tasks. Use the invented schema and sample data below. Handle duplicates, out-of-o...

Data Manipulation (SQL/Python)
2
0
28 people solved
Oct 13, 2025
Meta logo
Meta
Medium
Product Manager

Handling a Rival Team Building an Overlapping Product

You find out that another team is building a product that competes head-on with yours. How do you respond? `hint Diagnose before you react Before choo...

Product / Decision MakingAmbiguity & Decision MakingConflict & Collaboration
0
0
9 people solved
Mar 1, 2026
Otter.Ai logo
Otter.Ai
Medium
Software Engineer

Fixed-Width Text Display

Fixed-Width Text Display You are building a text display that renders a sequence of words inside a viewport of a fixed character width maxWidth. The d...

Coding & Algorithms
6
0
70 people solved
Mar 24, 2026
Meta logo
Meta
Medium
Data Scientist

Propose an ads recommendation model for shop ads

You need to propose a modeling approach for recommending/ranking shop ads (i.e., which shop ads to show and in what order) for a marketplace app. Desc...

Machine Learning
7
0
59 people solved
Oct 14, 2025
Reddit logo
Reddit
Medium
Machine Learning Engineer

Build and evaluate click prediction models

Click-Through Rate (CTR) Prediction: Build, Compare, and Justify Models Context You are given a tabular dataset for binary click prediction (click = 1...

Machine LearningCTR Prediction & Ads MLModel Evaluation
18
0
231 people solved
Sep 6, 2025
Meta logo
Meta
Medium
Software Engineer AI

Maximum Length of a Word Selection With All Unique Characters

You are given an array of lowercase strings words. Select a subset of these words (zero or more, chosen in any order) and concatenate them. The select...

Coding & Algorithms
4
0
41 people solved
Mar 6, 2026
Snapchat logo
Snapchat
Medium
Machine Learning Engineer Locked

Model an ads ranking system

This question evaluates machine learning modeling, feature engineering, and systems-level ranking competencies for ad selection and monetization, cove...

Machine LearningRanking ModelsCTR Prediction & Ads ML
12
0
106 people solved
Feb 12, 2026
Snapchat logo
Snapchat
Hard
Software Engineer

Implement LRU cache and prime products array

You are given two separate coding tasks. Task 1: Implement an LRU cache Implement an in-memory cache with a fixed capacity that evicts the least recen...

Coding & AlgorithmsData Structure DesignBacktracking & Recursion
18
0
138 people solved
Oct 28, 2025
Voleon logo
Voleon
Easy
Data Scientist

Solve Markov, OLS-rotation, and coin-toss probability

Answer the following three interview questions. 1) Basic properties of a Markov (transition) matrix Let \(P\) be a transition matrix of a (time-homoge...

Statistics & MathProbabilityRegression & Statistical Modeling
80
0
713 people solved
Oct 6, 2025
Capital One logo
Capital One
Hard
Data Scientist

Evaluate and monitor a credit risk model

Credit-Risk PD Model: Evaluation Priorities and End-to-End Plan Context: You are deploying a consumer credit probability-of-default (PD) model for 12-...

Machine LearningModel EvaluationModel Monitoring & Drift
19
0
156 people solved
Oct 13, 2025
DoorDash logo
DoorDash
Hard
Data Scientist

Determine Optimal Dasher Compensation Model and Diagnose Metric Drops

Determine Optimal Dasher Compensation Model and Diagnose Metric Drops Time-Based Dasher Pay Pilot and Marketplace Root-Cause Analysis Context DoorDash...

Analytics & ExperimentationExperiment Design (A/B Testing)Metric Diagnostics
11
0
153 people solved
Aug 4, 2025
DoorDash logo
DoorDash
Medium
Software Engineer

Debug round-robin request router

Debug round-robin request router Round-Robin Request Router with Health and Dynamic Membership You are given a list of backend servers and an incoming...

System DesignDebuggingData Structure Design
47
1
568 people solved
Aug 9, 2025
Airwallex logo
Airwallex
Medium
Data ScientistSenior+

Explaining a KYC Submit-Rate Rise From 25% to 35% Among New Business Signups

A fintech platform for businesses tracks its KYC submit rate: the share of new signups that go on to submit Know Your Customer (KYC) verification docu...

Analytics & ExperimentationMetric DiagnosticsCausal Inference
0
0
2 people solved
Aug 15, 2026
Google logo
Google
Easy
Software Engineer

Answer leadership and quality tradeoff questions

Answer the following behavioral questions with specific examples. 1. Describe a project you led. Why was it challenging? 2. Have you changed any hobbi...

Behavioral & LeadershipLeadership & InfluenceMentoring & Team Growth
8
2
119 people solved
Feb 11, 2026
Capital One logo
Capital One
Medium
Data Scientist

Refactor code and enforce robustness

Code Review and Refactor: Summing a CSV Column Context You are reviewing a short Python script that sums a numeric column from a CSV using pandas. You...

Coding & AlgorithmsCode Quality & MaintainabilityPandas & Python Data
10
0
163 people solved
Oct 13, 2025
Samsung logo
Samsung
Medium
Machine Learning Engineer

Maximize sum of non-adjacent values

Problem You are given an integer array nums representing the amount of money available at each house along a street. If you take money from house i, y...

Coding & Algorithms
7
0
71 people solved
Mar 1, 2026
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