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

"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

Qube Research & Technologies

Medium

Software Engineer

Implement a type-erased function wrapper

Implement a minimal std::function-like callable wrapper in C++ using type erasure via inheritance and a virtual call. Define a template Function<R(Arg...

Coding & AlgorithmsProgramming LanguagesMemory Management

Find the Longest Palindromic Substring in Linear Time

Implement longest_palindromic_substring(s) and achieve O(n) time. Return the longest contiguous substring that reads the same forward and backward. If...

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

Assess Fundamental Statistics Knowledge in Data-Science Interviews

Fundamental Statistics for a Data Science Interview You are given several standard statistics tasks commonly used in a data-science technical screen. ...

Statistics & MathSampling & EstimationProbability

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

Design an order-matching engine

In-Memory Limit Order-Matching Engine (Limit Order Book) Context Design and implement an in-memory, single-instrument limit order book that supports l...

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

Minimize a String Using Allowed Swaps

You are given a string s of lowercase English letters and an array pairs, where each element pairs[i] = [a, b] means you may swap the characters at in...

Data EngineerSenior+ Locked

Build a Firmware Data Quality and Release-Feedback Framework

Design a firmware telemetry quality framework that brings data and firmware teams together around versioned contracts, pre-release tests, canary check...

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

Count Squares Formed by Segments

Count Squares Formed by Segments You are given axis-aligned line segments with integer coordinates. Each segment is represented by two endpoints. One ...

Count permutations with exactly n inversions

You are given two integers m and n. Consider all permutations of the array [1, 2, ..., m] (each number from 1 to m appears exactly once). A permutatio...

Coding & AlgorithmsDynamic ProgrammingMath & Number Theory

Design a distributed rate limiter

Design a Rate Limiter with Burst Allowance and Distributed Coordination Context You are designing a rate limiter for an API gateway that serves high Q...

System DesignRate LimitingConcurrency

Find users with multi-country successful logins

Given a table login_attempts with columns: user_id (TEXT), timestamp (TIMESTAMP), status (TEXT), and country (TEXT), write an SQL query to return the ...

Data Manipulation (SQL/Python)SQL

Implement a multi-step form in React

Build a Multi‑Step Form Component in React Context You are implementing a multi‑step web form in React. The form gathers user data over several steps ...

Software Engineering FundamentalsReact & UI FrameworksState Management

Backend EngineerIntern Locked

Explain Backend Fundamentals and AI Tooling

This question evaluates understanding of core backend and AI tooling topics including operating system concepts (processes vs threads), networking (TC...

Software Engineering FundamentalsAI-Assisted DevelopmentNetworking

Software Engineer Locked

Design an n x n Tic-Tac-Toe Game

This question evaluates a candidate's ability to design a class-based data structure that tracks game state and efficiently detects a win condition af...

Find earliest time password becomes irrecoverable

You are given a password string of length n and an attack order array attackOrder[1..n], a permutation of 1..n. At second i (1-indexed), the virus rep...

Find motion intervals above threshold

You are processing data from a single security camera. You are given: - A threshold value T (a real number). - A vector (array) of time-stamped motion...

Coding & AlgorithmsArrays & Strings

Design camera access-control service

Design camera access-control service Design an Access-Control Service (Users, Cameras, Nested Groups) Context You are building a multi-tenant access-c...

System DesignAuthentication & AuthorizationStorage & Sharding

229 people solved

Aug 8, 2025

Tech Interview Questions

Implement a type-erased function wrapper

Find the Longest Palindromic Substring in Linear Time

Design LLM search handling long token inputs

Assess Fundamental Statistics Knowledge in Data-Science Interviews

Design a Read-Once Chat System

Design an order-matching engine

Design loan application system

Minimize a String Using Allowed Swaps

Build a Firmware Data Quality and Release-Feedback Framework

Return all root-to-leaf tree paths

Count Squares Formed by Segments

Count permutations with exactly n inversions

Design a distributed rate limiter

Find users with multi-country successful logins

Implement a multi-step form in React

Explain Backend Fundamentals and AI Tooling

Design an n x n Tic-Tac-Toe Game

Find earliest time password becomes irrecoverable

Find motion intervals above threshold

Design camera access-control service

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