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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
Vercel logo
Vercel
Medium
Software Engineer Locked

Count Hits in the Past Five Minutes

Implement a five-minute hit counter with ordered timestamped operations, repeated hits, and an explicit 300-second expiration boundary.

Coding & AlgorithmsData Structure DesignStacks & Queues
10
0
87 people solved
Sep 12, 2026
Amazon logo
Amazon
Easy
Data ScientistSenior+

Design and evaluate a RAG system

You are interviewing for an L5 Data Scientist role focused on LLM applications. Design a retrieval-augmented generation (RAG) system for an internal q...

Machine LearningRetrieval-Augmented GenerationEmbeddings & Vector Search
32
0
240 people solved
Jan 12, 2026
OpenAI logo
OpenAI
Medium
Machine Learning Engineer

Explain KV cache in Transformer inference

Question In Transformer-based large-language-model inference, what is a key-value (KV) cache? Give a complete, systems-level explanation that covers: ...

Software Engineering FundamentalsTransformers & AttentionLLM Inference & Serving
328
1
2239 people solved
Jan 6, 2026
Dropbox logo
Dropbox
Medium
Product Manager

Choose the first Dropbox feature to build for distributed teams, and defend the pick

You are interviewing for a product manager role at Dropbox. The interviewer explains that Dropbox wants teams whose members work remotely to find it e...

Product Design & StrategyProduct Design & ImprovementPrioritization & Tradeoffs
0
0
13 people solved
Sep 17, 2026
Ramp logo
Ramp
Medium
Software Engineer Locked

Find User Airport at a Time

This question evaluates the ability to model and query time-interval flight data for multiple users, testing skills in data structures, sorting and se...

Coding & Algorithms
14
0
180 people solved
May 26, 2026
Apple logo
Apple
Medium
Software Engineer

Design Large-Document Uploads and Multi-Device Synchronization

Design a document-sharing service that supports uploading documents, including large files, and synchronizing changes across multiple devices. Clarify...

System DesignFile & Media StorageConsistency & Availability
1
0
14 people solved
Jul 25, 2026
Waymo logo
Waymo
Medium
Software Engineer Locked

Design an Object Storage Service With Buckets, Keys and Durable Blob Storage

Design an object storage service where clients store, read, list and delete blobs by key inside buckets. Covers the API, separating metadata from data...

System DesignFile & Media StorageStorage & Sharding
2
0
34 people solved
Sep 10, 2026
Bloomberg logo
BloombergGoogleMeta

Also asked at Meta, Amazon, Microsoft

Easy
Software Engineer

Check Whether Quarter-Turns Match a Target Matrix

Problem Two square binary matrices mat and target have the same dimensions. Return whether rotating mat by any number of ninety-degree turns, includin...

Coding & AlgorithmsGrids & Matrices
1
0
12 people solved
Coinbase logo
Coinbase
Medium
Software Engineer

Design crypto trading order control API

You are implementing part of a simple crypto trading system that manages client orders. Each order can be in one of several states: NEW, ACTIVE, PAUSE...

Coding & AlgorithmsSimulation & State MachinesData Structure Design
18
0
277 people solved
Dec 8, 2025
Millennium logo
Millennium
Medium
Software EngineerIntern

C++ Atomics, Memory Ordering, and Safe Publication

What is an atomic operation in C++, and how is std::atomic different from protecting shared state with a mutex? Use a shared counter and a producer pu...

Software Engineering FundamentalsConcurrencyProgramming Languages
11
0
88 people solved
Apr 26, 2026
Google logo
Google
Medium
Software EngineerSenior+

Leading an Engineering Team Back From Low Morale

You are interviewing for an engineering manager role, and the interviewer asks about leading people through a hard stretch: tell me about a time a tea...

Behavioral & LeadershipMentoring & Team GrowthLeadership & Influence
1
0
19 people solved
Aug 15, 2026
Point72 logo
Point72
Medium
Quantitative ResearcherIntern

Defend a Quantitative Factor Research Project

Defend a Quantitative Factor Research Project Choose a quantitative research project you have worked on and explain its factor construction, informati...

Machine LearningPortfolio Construction & Alpha ResearchProject Deep Dive
3
0
40 people solved
Sep 7, 2026
Robinhood logo
Robinhood
Medium
Backend Engineer

Describe a Failure and the Change It Prompted

Tell me about a failure in your work. Explain what you were responsible for, what went wrong, how you responded, and what you changed afterward. Const...

Behavioral & LeadershipFailure & Learning
1
0
9 people solved
Sep 29, 2026
Amazon logo
Amazon
Hard
Software Engineer AI

Diagnose Return Eligibility Scoring Bugs

You are working on an e-commerce return-eligibility service. For each return request, the service computes a risk score using signals such as: - how m...

Software Engineering FundamentalsDebugging
15
0
256 people solved
Jan 12, 2026
Shopify logo
Shopify
Medium
Software Engineer Locked

Bank Account Simulation Class With Self-Written Tests at 90% Coverage

A pair-programming exercise: implement a class that simulates bank account operations, write your own tests reaching at least 90% coverage, and then e...

Software Engineering FundamentalsTesting & QualityLow-Level Design (OOP)
5
0
118 people solved
Sep 7, 2026
Capital One logo
Capital One
Medium
Software Engineer Locked

Arrange Match Results in Repeating Win-Draw-Loss Order

Rearrange a multiset of win, draw, and loss markers into repeated W-D-L rounds, skipping any marker once its supply is exhausted. The problem tests ex...

Coding & Algorithms
12
0
103 people solved
Jul 21, 2026
Google logo
Google
Medium
Software EngineerNew Grad

Design a restaurant waitlist system

You are implementing the waitlist system for a restaurant. Parties arrive over time, can cancel, and get seated when a table becomes available. Rules ...

Coding & AlgorithmsData Structure Design
146
2
1688 people solved
Mar 1, 2026
Coreweave logo
Coreweave
Medium
Software Engineer Locked

Design a Human Workflow Distribution System

This Coreweave system design question evaluates a human workflow distribution system with queueing, assignment, and progress tracking concerns. It is ...

System DesignJob Scheduling & WorkflowsDistributed Coordination
18
0
238 people solved
Jul 2, 2026
Juspay logo
JuspayAmazonGoogle

Also asked at Google, Microsoft, Bloomberg, TCS

Hard
Software Engineer

Fewest Replacements for a Consecutive Set

Problem One operation replaces any entry of nums with any integer. Return the fewest replacements needed to make all n entries distinct with maximum m...

Coding & AlgorithmsTwo Pointers & Sliding WindowSorting
0
0
17 people solved
NVIDIA logo
NVIDIA
Medium
Software Engineer

FP32 to Int8 Tensor Quantization: Scale, Zero Point, Clipping and Outliers

You are writing the numeric core of an int8 inference path: FP32 tensors (weights or activations) are converted to signed 8-bit integers so that they ...

Machine LearningML Coding
4
0
65 people solved
Sep 15, 2026
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