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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
11.9k
Companies
570
Updated
10.05.2026
11.9k Questions 570 Companies10.05.2026
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
Lyft logo
Lyft
Medium
Software Engineer Locked

Smallest Covering Window in a String

This question evaluates a candidate's ability to apply the sliding window technique to substring search problems. It tests understanding of two-pointe...

Coding & Algorithms
5
0
87 people solved
Jun 28, 2026
OpenAI logo
OpenAI
Hard
Software Engineer

Build a Reliable Streaming Chat UI

You are building a React-based chat interface where assistant responses stream into the UI token by token in real time (the same UX as a typical LLM c...

Software Engineering FundamentalsReact & UI FrameworksReal-Time Systems
22
0
250 people solved
Apr 4, 2026
Millennium logo
Millennium
Medium
Software EngineerIntern

How a C++ Mutex Protects Shared State

How does a mutex work in C++, and what must an application do for it to protect shared state correctly? Explain the language-level guarantee, a possib...

Software Engineering FundamentalsConcurrencyProgramming Languages
2
0
30 people solved
Apr 26, 2026
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Implement Social Graph Snapshot Queries

This question evaluates understanding of graph data structures, query-efficient indexing, and algorithmic trade-offs for static directed graphs, inclu...

Coding & AlgorithmsGraphsData Structure Design
10
0
127 people solved
Apr 13, 2026
Wayfair logo
Wayfair
Hard
Software Engineer

Maximize the Product of Pair Distance and Minimum Value

Implement maximum_pair_score(nums). Choose two distinct indices i and j and maximize: $$ \min(nums[i], nums[j])\,|i-j|. $$ Return the maximum score, n...

Coding & AlgorithmsTwo Pointers & Sliding WindowGreedy
5
0
50 people solved
Sep 9, 2026
OpenAI logo
OpenAI
Medium
Machine Learning Engineer

Design a Resumable Iterator with Checkpoint and Restore

Design a resumable iterator: an iterator that can serialize its current position into a compact, opaque checkpoint and later be reconstructed from tha...

Coding & Algorithms
14
0
160 people solved
Oct 18, 2025
Rippling logo
Rippling
Medium
Software Engineer Locked

Implement Food Delivery Billing

This question evaluates proficiency in implementing business billing rules, time and distance-based fee calculations, timestamp arithmetic, numerical ...

Coding & AlgorithmsArrays & Strings
23
0
256 people solved
Mar 12, 2026
Capital One logo
Capital One
Medium
Product Manager

Redesign the DMV Experience

You are asked to improve the DMV customer experience. You are given a short overview of DMV operations and several negative customer reviews. Answer: ...

Product Design & StrategyProduct Design & Improvement
27
0
415 people solved
Jun 12, 2025
Anthropic logo
Anthropic
Medium
Software Engineer

Parse and Reconstruct Stack Trace

Given a multi-line stack trace string from a single thread (e.g., each frame is in the form 'at Module::Function(file:line)'), design and implement a ...

Coding & AlgorithmsParsing & InterpretersTrees
62
1
934 people solved
Sep 6, 2025
Sig logo
Sig
Easy
Data Scientist

Count Grid Paths with No Three Equal Moves

Count Grid Paths with No Three Equal Moves A frog moves from (0, 0) to (5, 5). Every step is either one unit right or one unit up. The frog refuses to...

Statistics & Math
4
0
31 people solved
Aug 16, 2026
Zoox logo
Zoox
Medium
Software Engineer Locked

Three Array Problems for Trading Geometry and Grouping

Solve three independent array and grouping tasks: one buy/sell profit, a four-value line witness using distinct indices, and deterministic nickname-sa...

Coding & Algorithms
5
0
78 people solved
May 11, 2026
Meta logo
Meta
Medium
Software Engineer Locked

Explain an AI System You Designed and the Problem It Solved

Explain an AI system through its original problem, architecture, evaluation, safeguards, operational design, and measured impact. The prompt tests whe...

ML System Design
2
0
30 people solved
Aug 24, 2026
Jane Street logo
Jane Street
Hard
Machine Learning Engineer

Design an end-to-end training framework

Design an end-to-end training framework Design an End-to-End Time-Series Forecasting Framework (PyTorch) You are tasked with designing a production-gr...

ML System DesignMLOps & Model ServingModel Monitoring & Drift
53
0
522 people solved
Aug 1, 2025
Amazon logo
Amazon
Medium
Software EngineerSenior+ Locked

Resolve a Conflict Between Metrics and Customer Feedback

Analyze a decision where quantitative metrics and direct customer feedback appeared to disagree. Check instrumentation, segmentation, timing, and samp...

Analytics & Experimentation
3
0
47 people solved
Aug 22, 2026
Meta logo
Meta
Medium
Software Engineer Locked

Sum Numbers Formed by Root-to-Leaf Paths

Sum all numbers formed by root-to-leaf digit paths in a binary tree represented as a heap array. Carry each decimal prefix through the traversal, add ...

Coding & AlgorithmsTrees
5
0
93 people solved
Aug 8, 2026
Pinduoduo logo
Pinduoduo
Hard
Software EngineerSenior+

Count Longest Substrings After Character Replacements

You are given an uppercase English string s and a nonnegative integer k. A nonempty contiguous substring is valid if you can make all of its character...

Coding & AlgorithmsTwo Pointers & Sliding WindowArrays & Strings
1
0
14 people solved
Aug 22, 2026
Worldquant logo
Worldquant
Hard
Software Engineer Locked

Compare Functional and Object-Oriented Python Design

Compare functional and object-oriented approaches for a Python component that transforms records while maintaining configuration and optional cached s...

Software Engineering Fundamentals
4
0
41 people solved
Aug 3, 2026
Revolut logo
Revolut
Medium
Software EngineerNew Grad

Implement a random fixed-size load balancer

Problem: Build a simple load balancer Implement a minimal in-memory load balancer that routes each incoming request to one backend node chosen uniform...

Coding & AlgorithmsData Structure Design
40
0
321 people solved
Feb 11, 2026
DoorDash logo
DoorDash
Medium
Software Engineer Locked

Design Food Reviews, Votes, and Reviewer Rewards

Design food ratings, written reviews, review votes, and race-safe reviewer rewards with clear schema boundaries. Enforce one current vote per user and...

System DesignDistributed Transactions & IdempotencySystem Design Fundamentals
39
0
272 people solved
Jul 10, 2026
ByteDance logo
ByteDance
Medium
Software EngineerNew Grad Locked

Prevent a Cache Stampede on a Hot Key

Design protection against a cache stampede when a hot key expires across many application instances. Compare request coalescing, distributed refresh o...

System Design
3
0
26 people solved
Aug 13, 2026
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