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

"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_

"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"

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

"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."

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

"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."

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

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."

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

"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."

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

"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."

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

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

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

_The_TaNk_

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

"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."

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

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

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."

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

"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."

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

"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."

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

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

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

GoogleAmazonBloomberg

Easy

Software Engineer

Recognize Powers of Three without Iteration

Problem Return whether signed integer n is 3 raised to a nonnegative integer power. `cpp bool isPowerOfThree(int n); ` Examples `text n = 81 -> true n...

Coding & AlgorithmsMath & Number Theory

10 people solved

Revolut

Medium

Software EngineerNew Grad

Explain DB concurrency, debugging slowness, DDD and CQRS

Backend fundamentals: concurrency, performance investigation, and architecture terms Answer the following backend questions: 1. How do databases handl...

Software Engineering FundamentalsTransactions & IsolationDebugging

Frontend Engineer Locked

Selection-State Class for an Infinite-Scroll Checkbox List with Select All

A front-end design and coding question asking for a class that manages data and selection state for an infinite-scrolling list, with a checkbox on eve...

Software Engineering FundamentalsState ManagementUI Components & Accessibility

Software EngineerIntern Locked

Reveal a Minesweeper Region with Adjacent-Mine Counts

Implement a Minesweeper reveal operation that counts all eight neighboring cells, opens connected zero-mine regions, and stops expansion at numbered b...

Product design for a vertical takeoff and landing flying car

Design a car that can fly, lifting off and touching down vertically rather than using a runway. `hint Pick the trip before the machine Think about whi...

Product Design & StrategyProduct Sense

Self-Introduction, Why This Role, Two Strengths and a Weakness, and a Java Self-Rating

On a short screening call for a software engineer position that involves Java, the recruiter asks a sequence of standard questions, then probes how st...

Behavioral & LeadershipSelf-Awareness & GrowthMotivation & Fit

Software EngineerSenior+ Locked

Find Unique Zero-Sum Triplets

Find unique zero-sum triplets with distinct indices, deterministic ordering, careful duplicate suppression, and explicit time and space analysis.

Coding & AlgorithmsTwo Pointers & Sliding WindowSorting

100 people solved

Sep 10, 2026

AmazonGoogleMicrosoft

Easy

Software Engineer

Count Distinct Active Users in the Inclusive Thirty-Day Window

Problem Report day and active_users for dates in the 30-day period ending 2019-07-27 inclusive. A user is active after any activity of the listed type...

Data Manipulation (SQL/Python)SQL

9 people solved

Medium

Software Engineer Locked

Design a Scalable Calendar Service

Design calendar event storage and time-range reads, explain concurrent edits and scaling, and clarify recurrence and notification requirements.

System DesignSystem Design FundamentalsStorage & Sharding

85 people solved

Sep 12, 2026

Easy

Data ScientistSenior+

Evaluate a Following-Only Home Feed and Measure Its Impact

A professional social network is considering changing its home feed so that it shows only posts from accounts the member follows. Assume today's ranke...

Analytics & ExperimentationExperiment Design (A/B Testing)Metrics & KPIs

Machine Learning Engineer

Design a recommendation system end-to-end

Design a Recommendation System End-to-End You are asked to design a large-scale recommendation system that powers a personalized feed — for example, a...

ML System DesignRecommendation SystemsRanking Models

Select a Kth-Largest Occurrence without Full Sorting

Problem Return the kth largest value in an integer array, counting repeated values separately. This means position k in descending sorted order, not t...

Coding & AlgorithmsHeaps & Priority QueuesSorting

Decide the Winner of Optimal End-Pile Stone Selection

Problem Two players alternately take an entire pile from either end of a row, with the first player moving first. Both maximize their final stone tota...

Coding & AlgorithmsMath & Number TheoryDynamic Programming

Largest Share from the Circular Pizza Selection Game

Problem The circular slices array has length 3*n. Repeatedly choose any remaining slice for yourself; Alice then takes its immediate remaining anticlo...

Coding & AlgorithmsDynamic ProgrammingArrays & Strings

Design a Real-Time Online Typing Game With Fair Races and Crash Recovery

Design an online typing game. The report names only the problem; the discussion it describes covered the read and write paths, changes needed at scale...

System DesignMultiplayer Game SystemsFault Tolerance & Failover

Software Engineer Locked

Design a Pre-Login Risk and Challenge Service

Design a pre-login challenge service with risk-based selection, versioned challenge definitions, server-side verification, replay controls, and recove...

System DesignApplication SecurityAPI Design

Machine Learning EngineerSenior+

Explain SFT, DPO, PPO, and the Role of KL Regularization

Explain the objectives and practical differences among supervised fine-tuning (SFT), Direct Preference Optimization (DPO), and PPO-based language-mode...

Machine LearningFine-Tuning & Alignment TechniquesReinforcement Learning

Design a Peer-to-Peer Money Transfer System

Design a peer-to-peer money-transfer product. Users can hold an account, send money to another user, view transfer history, and see an accurate balanc...

System DesignPayments & LedgersDistributed Transactions & Idempotency

Implement a Versioned Key-Value File Store

Implement an in-memory file store that supports progressive requirements. Operations include set(key, value), get(key), delete(key), scan(), scan_pref...

Software Engineer Locked

Arrange Nonnegative Integers to Form the Largest Number

Arrange nonnegative integers so their decimal strings form the largest possible concatenation. The prompt requires every value exactly once, returns a...

Coding & Algorithms

79 people solved

Aug 19, 2026

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Tech Interview Questions

Recognize Powers of Three without Iteration

Explain DB concurrency, debugging slowness, DDD and CQRS

Selection-State Class for an Infinite-Scroll Checkbox List with Select All

Reveal a Minesweeper Region with Adjacent-Mine Counts

Product design for a vertical takeoff and landing flying car

Self-Introduction, Why This Role, Two Strengths and a Weakness, and a Java Self-Rating

Find Unique Zero-Sum Triplets

Count Distinct Active Users in the Inclusive Thirty-Day Window

Design a Scalable Calendar Service

Evaluate a Following-Only Home Feed and Measure Its Impact

Design a recommendation system end-to-end

Select a Kth-Largest Occurrence without Full Sorting

Decide the Winner of Optimal End-Pile Stone Selection

Largest Share from the Circular Pizza Selection Game

Design a Real-Time Online Typing Game With Fair Races and Crash Recovery

Design a Pre-Login Risk and Challenge Service

Explain SFT, DPO, PPO, and the Role of KL Regularization

Design a Peer-to-Peer Money Transfer System

Implement a Versioned Key-Value File Store

Arrange Nonnegative Integers to Form the Largest Number

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