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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
ByteDance logo
ByteDance
Easy
Site Reliability Engineer Locked

Validate Matching Brackets

Determine whether a long string of parentheses, square brackets, and braces is correctly nested and type-matched. The problem tests stack discipline, ...

Coding & Algorithms
1
0
34 people solved
Sep 1, 2026
Meta logo
Meta
Medium
Data Scientist Locked

Evaluate a Live-Stream Group Notification Under Network Effects

Design an evaluation for live-stream group notifications that measures product impact beyond clicks. Define an intent-to-treat effect, address network...

Analytics & ExperimentationExperiment Design (A/B Testing)Causal Inference
29
1
231 people solved
Jul 6, 2026
Purestorage logo
Purestorage
Medium
Software Engineer

Design a thread-safe event dispatcher

Problem: "Event fire" / event dispatcher with multithreading Design an in-memory event system that supports registering listeners and firing events. C...

Software Engineering FundamentalsConcurrencyData Structure Design
45
0
520 people solved
Nov 5, 2025
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Design an Asynchronous Text-to-Video Generation Service

Design an asynchronous text-to-video service with durable jobs, long-running generation workers, and retrievable media assets. The case asks whether S...

System Design
8
0
79 people solved
Jul 19, 2026
Yelp logo
Yelp
Easy
Data Scientist

Recommend a Decision After a Nonsignificant Experiment

An A/B test estimates a 2.0% relative improvement in a primary metric, with a two-sided 95% confidence interval from -0.5% to 4.5% and (p=0.12). Guard...

Analytics & Experimentation
9
0
115 people solved
Aug 27, 2026
OpenAI logo
OpenAI
Hard
Software Engineer

Implement a Contiguous Memory Allocator with Primitive Lists

Implement a Contiguous Memory Allocator with Primitive Lists Simulate an allocator over the contiguous address range [0, capacity), initially one free...

Coding & Algorithms
8
0
99 people solved
Feb 19, 2026
Mercor logo
Mercor
Medium
Machine Learning Engineer Locked

Evaluate Noisy Data for LLM Post-Training

This question evaluates competency in post-training data curation and experimental judgment for large language models, including assessing noisy datas...

Machine LearningFine-Tuning & Alignment TechniquesAnnotation & Label Quality
29
0
301 people solved
May 31, 2026
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Design the GPU Job Scheduler for a Text-to-Video Generation Service

This system design question evaluates a candidate's ability to design a resource-scheduling layer for scarce, expensive compute under sustained overlo...

System DesignGPU InfrastructureJob Scheduling & Workflows
70
1
1276 people solved
Jun 26, 2026
Perceptyx logo
Perceptyx
Medium
Software Engineer

Demonstrate a Project and Defend Its Design

Choose a work or personal project for a technical demonstration and deep dive. Explain enough of the design and implementation for an interviewer to e...

Software Engineering FundamentalsProject Deep DiveSystem Design Fundamentals
1
0
23 people solved
Aug 27, 2026
Sig logo
Sig
Medium
Quantitative Trader

Counting Up-Right Grid Paths With No k Consecutive Moves in One Direction

A frog starts at $(0, 0)$ and wants to reach $(X, Y)$, where $X$ and $Y$ are nonnegative integers. Each move takes it one unit right or one unit up. T...

Statistics & MathDynamic ProgrammingMath & Number Theory
0
0
5 people solved
Sep 19, 2026
Stripe logo
Stripe
Medium
Software Engineer

Implement Luhn-based card validation and inference

Question Implement a set of utilities for credit-card validation and inference using the Luhn checksum algorithm and standard brand patterns. Brand pa...

Coding & Algorithms
17
1
226 people solved
Sep 6, 2025
Instacart logo
Instacart
Medium
Software Engineer

Respond to Negative Feedback About Your Work

Describe a time you received negative feedback about your work. What was the feedback, how did you determine what was valid, and what did you do in re...

Behavioral & LeadershipConflict & CollaborationCommunication & Stakeholders
2
0
23 people solved
Aug 28, 2026
Squarepoint logo
Squarepoint
Easy
Software EngineerIntern

Explain Database Indexes and Why Every Column Should Not Be Indexed

Explain what a database index does and why creating an index on every column can make a database perform worse. Use a relational table with frequent i...

Software Engineering FundamentalsIndexing & Query PerformanceDatabase Internals
2
0
33 people solved
Jun 20, 2026
Datadog logo
Datadog
Easy
Software Engineer

Implement buffered file writer with concurrency support

You are given a simple file writer class that writes data directly to disk: `cpp class FileWriter { public: // Append data to the file on disk imm...

Coding & AlgorithmsData Structure DesignConcurrency
91
0
964 people solved
Dec 2, 2025
Citadel logo
Citadel
Medium
Software Engineer Locked

Top-K Largest Elements in Every Sliding Window

This question evaluates the ability to design and maintain an ordered data structure that efficiently tracks the top K largest values within a moving ...

Coding & Algorithms
11
0
124 people solved
Jun 22, 2026
Amazon logo
Amazon
Easy
Software Engineer Locked

Design a Reliable AI Chatbot Architecture

Design a reliable multi-turn AI chatbot grounded in an approved knowledge corpus, with authorization-aware retrieval, visible uncertainty, responsive ...

ML System DesignRetrieval-Augmented GenerationAuthentication & Authorization
16
0
208 people solved
Aug 19, 2026
Google logo
Google
Medium
Software Engineer Locked

Rearrange Tasks With Cooldown

This question evaluates task-scheduling and constraint-handling skills, testing algorithmic reasoning about arranging repeated jobs with cooldown cons...

Coding & Algorithms
11
0
89 people solved
Jun 3, 2026
Amazon logo
Amazon
Medium
Software EngineerIntern

Find a valid dependency order

You are given n tasks labeled from 0 to n - 1 and a list of dependency pairs dependencies, where each pair [a, b] means task b must be completed befor...

Coding & AlgorithmsGraphs
22
0
261 people solved
Feb 15, 2026
Amazon logo
Amazon
Medium
Software Engineer Locked

Improve an Inefficient Team Process

Explain how you improved an inefficient team process, including evidence of the original problem, participation from its users, workflow changes, and ...

Behavioral & Leadership
1
0
23 people solved
Aug 16, 2026
Databricks logo
Databricks
Medium
Software Engineer Locked

Design a Book Price Aggregator

This question evaluates skills in distributed systems design, fault tolerance, scalability, integration with external services, transactional consiste...

System DesignSystem Design FundamentalsDistributed Transactions & Idempotency
139
2
1386 people solved
May 6, 2026
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