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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
Stripe logo
Stripe
Medium
Data Scientist

Write SQL for snapshot features and labels

Use 'today' = 2025-09-01. Invented schema (UTC): users(u_id INT, signup_dt DATE, country STRING) events(u_id INT, event_time TIMESTAMP, arrival_time T...

Data Manipulation (SQL/Python)
5
0
46 people solved
Oct 13, 2025
Anthropic logo
Anthropic
Medium
Software Engineer Locked

Implement an in-memory DB with TTL backup/restore

This question evaluates implementation and reasoning skills for an in-memory nested key→field→value store with TTL-based expirations, snapshot backup/...

Coding & AlgorithmsData Structure Design
94
2
1038 people solved
Feb 11, 2026
Amazon logo
AmazonGoogleBloomberg
Medium
Software Engineer

Minimum Moves to Collect Classroom Litter

Minimum Moves to Collect Classroom Litter You are given a rectangular grid classroom and a positive integer energy. The grid contains: - S: the starti...

Coding & AlgorithmsGrids & MatricesGraphs
0
0
8 people solved
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Design Online Chess Matchmaking

This question evaluates a candidate's ability to design scalable, low-latency matchmaking backend systems, covering distributed service decomposition,...

System DesignMultiplayer Game SystemsDistributed Coordination
28
0
398 people solved
May 24, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer

Design an in-memory database

Design an in-memory database System Design: In-Memory Key–Value Database for Ultra–Low Latency Context You are designing an in-memory, per-node key–va...

System DesignKey-Value StoresDatabase Internals
38
0
260 people solved
Jul 15, 2025
Google logo
GoogleUberRoku

Also asked at Roku, Adobe, Airbnb, PhonePe

Hard
Software Engineer

Find the Fewest Grid Moves Needed to Collect Every Key

Problem In grid, @ is the single start, . is empty floor, and # is a wall. Lowercase letters are keys and their uppercase versions are locks. Move one...

Coding & AlgorithmsGrids & MatricesGraphs
0
0
7 people solved
IBM logo
IBMAmazon
Medium
Software Engineer

Measure the Longest Substring Advancing One Alphabet Letter at a Time

Problem An alphabetical continuous substring is a contiguous piece of the ordinary alphabet abcdefghijklmnopqrstuvwxyz. In lowercase s, return the gre...

Coding & AlgorithmsArrays & Strings
0
0
9 people solved
OpenAI logo
OpenAI
Hard
Software Engineer

Debug a failing ML classifier

Debugging a Churn Prediction Pipeline With Poor Generalization Context You have inherited a binary churn prediction system. The goal is to predict whe...

Machine LearningML FundamentalsModel Evaluation
85
0
714 people solved
Jul 28, 2025
ByteDance logo
ByteDance
Medium
Software EngineerNew Grad Locked

Explain Composite and Covering Indexes in MySQL

Explain how a MySQL composite B-tree index on tenant, status, and creation time serves different query shapes. Cover the leftmost-prefix rule, equalit...

Software Engineering Fundamentals
3
0
30 people solved
Aug 13, 2026
xAI logo
xAI
Medium
Software Engineer Locked

Flatten and unflatten nested Python structures

This question evaluates proficiency in manipulating nested data structures, deterministic traversal and mapping between hierarchical shapes and flat i...

Coding & AlgorithmsBacktracking & RecursionProgramming Languages
14
0
165 people solved
Mar 1, 2026
Meta logo
Meta
Medium
Product Manager

Product Sense: Fixing a Core Pain Point in WhatsApp Group Chats

You are a product manager at Meta working on WhatsApp. Design a product or feature that improves how people communicate in WhatsApp groups. Choose whi...

Product Design & StrategyProduct Design & ImprovementMetrics & KPIs
1
0
14 people solved
Sep 25, 2026
Google logo
GoogleMicrosoft
Medium
Software Engineer

Maximum Grid Path Score Within a Budget

Problem You are given an m by n integer grid and an integer budget k. Start at the top-left cell (0,0) and reach the bottom-right cell (m-1,n-1), movi...

Coding & AlgorithmsDynamic ProgrammingGrids & Matrices
1
0
9 people solved
Uber logo
Uber
Medium
Data ScientistNew Grad Locked

Compute 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
6
0
76 people solved
Apr 30, 2026
ByteDance logo
ByteDance
Hard
Data ScientistIntern

Predict Short-Video Engagement with Skewed Data

Predict Short-Video Engagement with Skewed Data You need to predict a future engagement quantity for a short video. Explain what data you would reques...

Machine LearningSupervised LearningFeature Engineering
1
0
22 people solved
Sep 11, 2026
Shopify logo
Shopify
Medium
Software Engineer AI

Implement a Constant-Time LRU Cache

Implement a Constant-Time LRU Cache Implement a fixed-capacity least-recently-used cache. The captured source identifies an LRU cache coding problem b...

Coding & Algorithms
18
0
126 people solved
Apr 28, 2026
Meta logo
MetaAmazonGoogle

Also asked at Google, Microsoft, Apple, Nuro, Goldman Sachs, Waymo, LinkedIn, Uber, Coinbase, TikTok, Two Sigma, Liftoff, Bloomberg, Criteo, PayPal

Medium
Software Engineer

Design weighted random index picker

Design and implement a data structure that, given an array of positive integer weights w[0..n−1], supports pick() that returns index i with probabilit...

Coding & Algorithms
11
0
100 people solved
Zscaler logo
Zscaler
Medium
Software EngineerSenior+ Locked

Reason About Remote Browser Isolation and Secure Media Delivery

Compare remote browser isolation, Zero Trust access, and VPN connectivity, then design secure delivery for large blobs and partially playable media. K...

Software Engineering Fundamentals
2
0
38 people solved
Jul 30, 2026
Shopify logo
Shopify
Easy
Software EngineerSenior+ AI

Build a Local URL Shortener

Implement a local URL shortener that runs on a single machine. Design a small library or service with two core operations: - shorten(long_url) -> shor...

Coding & AlgorithmsData Structure Design
89
0
637 people solved
Jan 24, 2026
Meta logo
Meta
Medium
Data Engineer Locked

Write queries for follows and bookings

This question evaluates the ability to manipulate temporal event logs, enforce bidirectional relational integrity, and implement efficient graph and i...

Coding & AlgorithmsSQLIntervals & Scheduling
30
2
207 people solved
Mar 1, 2026
Bloomberg logo
BloombergGoogle
Medium
Software Engineer

Count Ordered Equal-Distance Point Triples

Count Ordered Equal-Distance Point Triples You are given distinct points in the plane. Count ordered triples of distinct point indices (i,j,k) for whi...

Coding & AlgorithmsMath & Number TheoryArrays & Strings
0
0
5 people solved
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