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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.2k
Companies
569
Updated
10.14.2026
12.2k Questions 569 Companies10.14.2026
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
Capital One logo
Capital One
Medium
Machine Learning Engineer

Return all root-to-leaf tree paths

Given the root of a binary tree, return all root-to-leaf paths. - A leaf is a node with no children. - A path should be represented as a string with n...

Coding & AlgorithmsTreesBacktracking & Recursion
16
0
123 people solved
Dec 15, 2025
xAI logo
xAI
Medium
Software Engineer Locked

Implement a parallelized sort

This question evaluates understanding of parallel algorithms, shared-memory concurrency primitives, synchronization, workload partitioning, and perfor...

Coding & Algorithms
9
0
66 people solved
Jan 22, 2026
Grammarly logo
Grammarly
Medium
Software Engineer

Design a Read-Once Chat System

Design a chat messaging system where one sender can select multiple recipients at send time, but the message is not a group chat message. Instead, the...

System DesignReal-Time SystemsMessaging & Event-Driven
35
0
277 people solved
Apr 6, 2026
Snapchat logo
Snapchat
Medium
Machine Learning Engineer

Design short-video retrieval with sparse text

You are designing the candidate-generation (retrieval) and recommendation system for a short-video app. Constraints and setting: - Users can search wi...

ML System Design
13
0
101 people solved
Feb 3, 2026
Salesforce logo
Salesforce
Medium
Software Engineer

Find a Celebrity from a Knows Matrix

Problem Among n people, a celebrity knows nobody else and is known by everybody else. Determine the celebrity's index, or return -1 if no celebrity ex...

Coding & Algorithms
1
0
30 people solved
Feb 22, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer

Design LLM search handling long token inputs

Design an LLM-powered search and question-answering system over a large corpus of documents such as internal wikis, PDFs, logs, contracts, and web pag...

ML System DesignRetrieval-Augmented GenerationLLM Applications
24
0
241 people solved
Apr 6, 2025
Parafin logo
Parafin
Hard
Software Engineer

Design loan application system

Design an End-to-End Loan Application Platform You are a software engineer at a small lending startup. Design a scalable, compliant loan origination s...

System DesignSystem Design FundamentalsDistributed Transactions & Idempotency
76
0
546 people solved
Aug 4, 2025
Oscar logo
Oscar
Medium
Software Engineer

Design Telehealth Consultation Queue

Design a web-based queuing application for a health-insurance company that offers free 24/7 telehealth access to its members through a website and mob...

System Design
5
0
72 people solved
Apr 15, 2026
Roblox logo
Roblox
Medium
Data Scientist

How to estimate a feature’s causal impact on time spent

You work on a Roblox-like game platform. A new product change ("feature") is rolled out and you want to estimate its causal impact on user engagement,...

Analytics & ExperimentationCausal InferenceRegression & Statistical Modeling
13
0
237 people solved
Jan 13, 2026
Capital One logo
Capital One
Easy
Machine Learning Engineer Locked

How would you improve card-type detection?

This question evaluates a candidate's ability to design robust detection logic, covering system design, data modeling, validation, and operational con...

Software Engineering FundamentalsPayments & LedgersCode Quality & Maintainability
15
0
128 people solved
Feb 11, 2026
PayPal logo
PayPal
Medium
Data Scientist

Design elevator scheduling for small building

Design elevator scheduling for small building Design the control policy for a single elevator serving a small building: 3 floors plus 1 basement (stop...

System DesignSimulation & State MachinesSystem Design Fundamentals
10
0
120 people solved
Jul 31, 2025
Uber logo
Uber
Medium
Software EngineerSenior+

Design cart management lifecycle service

Scenario You are designing the backend for an on-demand delivery app (restaurants and grocery). Users can create a cart, modify items from multiple de...

System DesignDistributed Transactions & IdempotencyTransactions & Isolation
146
0
1077 people solved
Mar 1, 2026
Amazon logo
Amazon
Medium
Software EngineerIntern Locked

Resolve Conflict and Challenge Project Decisions

This question evaluates conflict resolution, ownership, stakeholder management, technical judgment, and the ability to earn trust and influence within...

Behavioral & LeadershipConflict & CollaborationAmbiguity & Decision Making
24
0
206 people solved
May 19, 2026
Amazon logo
Amazon
Medium
Software EngineerIntern

Describe Deadline, Mistake, Problem-Solving, and AI Experiences

You are interviewing for a Software Engineer (Intern) role at Amazon, in an on-site loop of two back-to-back 60-minute rounds. Each round mixes a beha...

Behavioral & LeadershipOwnership & ExecutionAI-Assisted Development
30
0
477 people solved
Apr 20, 2026
Waymo logo
Waymo
Medium
Frontend EngineerSenior+ Locked

Debug an Angular UI from User Reports

Debug an existing Angular component from concrete user reports without inventing missing source details. Reproduce each failure, trace state and lifec...

Software Engineering Fundamentals
5
0
48 people solved
May 11, 2026
Amazon logo
Amazon
Medium
Software Engineer

Rearrange a String So Adjacent Characters Differ

Problem Rearrange the characters of a lowercase string so that no two adjacent characters are equal. Return the lexicographically smallest valid rearr...

Coding & Algorithms
5
0
39 people solved
May 1, 2026
Instacart logo
Instacart
Hard
Software Engineer

Troubleshoot a production incident end-to-end

Troubleshoot a production incident end-to-end Incident Troubleshooting: Intermittent Failures and Elevated Latency in Transfers Context A microservice...

System DesignDebuggingObservability
15
0
140 people solved
Aug 1, 2025
Google logo
Google
Hard
Software Engineer Locked

Design street-view image ingestion and storage system

This question evaluates understanding of large-scale system design for media ingestion, covering distributed ingestion pipelines, durable storage and ...

System DesignFile & Media StorageAuthentication & Authorization
28
0
310 people solved
Jan 22, 2026
Airbnb logo
Airbnb
Medium
Software Engineer

Check inorder subsequence and edit tree minimally

Given a binary tree whose nodes store integers and an array target, determine whether target is a subsequence of the tree's inorder traversal (element...

Coding & AlgorithmsTreesDynamic Programming
26
1
241 people solved
Sep 6, 2025
Citadel logo
Citadel
Easy
Software Engineer Locked

Implement LRU/LFU cache with custom eviction

This question evaluates proficiency in cache design and data-structure implementation, focusing on eviction policies (LRU, LFU), metadata tracking for...

Coding & AlgorithmsData Structure Design
30
0
289 people solved
Feb 11, 2026
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