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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.1k
Companies
579
Updated
10.10.2026
12.1k Questions 579 Companies10.10.2026
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
Salesforce logo
Salesforce
Hard
Software Engineer Locked

Design an async job system and cache layer

This question evaluates system design competencies including asynchronous job orchestration, reliable background processing (state transitions, retrie...

System DesignSystem Design FundamentalsCaching
16
0
163 people solved
Jan 22, 2026
Goldman Sachs logo
Goldman Sachs
Medium
Product Manager

Word Compression Algorithm

Algorithm Prompt: String Compression and Decompression with Run-Length Encoding Design algorithms to compress and decompress a string using run-length...

Product / Decision MakingArrays & StringsParsing & Interpreters
10
0
139 people solved
Jul 4, 2025
Airbnb logo
Airbnb
Hard
Software Engineer

Design a group chat system

Question Design the backend for a real-time group chat / messaging system at Airbnb scale — the in-app messaging that connects guests and hosts, inclu...

System DesignReal-Time Systems
23
0
268 people solved
Jan 19, 2026
Kneron logo
Kneron
Medium
Software Engineer

Count IoT devices matching date and threshold

Implement function numDevices(statusQuery, threshold, dateStr) that returns the number of IoT devices from a paginated REST API that were added in the...

Data Manipulation (SQL/Python)
3
0
38 people solved
Jul 26, 2025
Citadel logo
Citadel
Medium
Data Scientist

Implement Infinite Fibonacci Generator Using Lazy Evaluation

Scenario Testing understanding of Python lazy evaluation and generators. Question Explain what lazy evaluation means in Python and implement a generat...

Coding & Algorithms
27
0
114 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Hard
Machine Learning EngineerSenior+ Locked

Design a real-time home feed ranker

This question evaluates an engineer's ability to design scalable, low-latency real-time recommendation and ranking systems that integrate personalizat...

ML System DesignRecommendation SystemsPersonalization
19
0
148 people solved
Jan 12, 2026
Rippling logo
Rippling
Medium
Software Engineer Locked

Design personalized news aggregation service

The question evaluates the ability to design a large-scale personalized content delivery system, testing competencies in distributed systems architect...

System DesignSearch & Feed SystemsPersonalization
10
0
90 people solved
Oct 4, 2025
Squarepoint logo
Squarepoint
Medium
Data Scientist

Compute drawdown, profit, and coin change

Question What is the maximum drawdown of a cumulative PnL (profit and loss) series, and when did it occur? Implement a function mdd(pnl) that returns ...

Coding & Algorithms
11
0
94 people solved
Aug 4, 2025
ByteDance logo
ByteDance
Medium
Machine Learning Engineer

Compute Sentence Similarity

Given two text inputs, design and implement a method to compute their semantic similarity. You may use either of the following approaches: 1. Encode e...

Machine Learning
3
0
48 people solved
Jan 7, 2026
Uber logo
Uber
Medium
Data Scientist

Evaluate Rider-Incentive Program Impact with Key Metrics

Evaluate a Rider-Incentive Program in a Ride-Hailing Marketplace A ride-hailing team plans to launch a new rider-incentive program and needs to evalua...

Analytics & ExperimentationExperiment Design (A/B Testing)Metrics & KPIs
80
0
223 people solved
Jul 12, 2025
Microsoft logo
Microsoft
Easy
Data ScientistNew Grad

Compute and plot a precision–recall curve

You are given model outputs for a binary classifier: - y_true: an array of 0/1 ground-truth labels of length n. - y_score: an array of predicted score...

Coding & AlgorithmsModel EvaluationSorting
11
1
115 people solved
Nov 24, 2025
Hard
Software Engineer

Implement a multi-button click detector

Implement a click detector for multiple physical buttons. You receive button state updates as a stream. Each update provides: - button_id (integer) - ...

Coding & Algorithms
8
0
63 people solved
Feb 3, 2026
Apple logo
Apple
Medium
Software Engineer Locked

Explain Runnable vs Callable and thread-safe Singleton

This question evaluates a candidate's knowledge of Java concurrency and design patterns, specifically distinctions between Runnable and Callable, mech...

Software Engineering FundamentalsConcurrencyProgramming Languages
17
0
140 people solved
Jan 17, 2026
Intuit logo
Intuit
Medium
Data Scientist

Design an idempotent churn ETL pipeline

You must build a daily pipeline that produces month-end churn metrics (logo churn, gross revenue churn, net revenue retention) from streaming subscrip...

Data Manipulation (SQL/Python)
2
0
29 people solved
Oct 13, 2025
Amazon logo
Amazon
Medium
Software EngineerSenior+ Locked

Design an Online Minesweeper Platform

This question evaluates competency in designing scalable, low-latency, real-time stateful systems, covering data modeling, API design, persistence, co...

System Design
5
0
58 people solved
Nov 17, 2025
Amazon logo
Amazon
Medium
Applied Scientist

Find shortest path in a grid with obstacles

You are given a 2D grid of size m x n representing a maze. Each cell in the grid is either empty (0) or blocked (1). You are also given two coordinate...

Coding & AlgorithmsGrids & Matrices
7
0
91 people solved
Dec 8, 2025
TikTok logo
TikTok
Hard
Software Engineer

Design a reusable React comment component

Design and Implement a Reusable Comment Input-and-Feed Component in React Goal Build a reusable React component that provides a comment input and feed...

System Design
9
0
80 people solved
Sep 6, 2025
Google logo
Google
Medium
Software Engineer

Answer product, collaboration, and prioritization scenarios

Behavioral / Leadership prompts Answer the following (you can assume a 35–40 minute behavioral interview): 1. Intro (5 minutes): Walk through your bac...

Behavioral & Leadership
4
0
59 people solved
Oct 14, 2025
DoorDash logo
DoorDash
Medium
Data Scientist

Identify Challenges and Solutions for Bike-Delivery Program

Identify Challenges and Solutions for a Bike-Delivery Program A food-delivery platform is considering a bike-based delivery option for couriers in sel...

Behavioral & LeadershipProduct StrategyBusiness Case Analysis
22
0
148 people solved
Jul 12, 2025
Amazon logo
Amazon
Medium
Applied Scientist

Explain Transformers and MoE in LLMs

You are interviewing for a role working with large language models (LLMs). Explain the following concepts and how they relate to building and scaling ...

Machine LearningTransformers & AttentionGPU Infrastructure
17
0
125 people solved
Dec 8, 2025
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