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

GoDaddyDoorDashMicrosoft

Medium

Software Engineer

Count Deletions that Balance Index-Parity Sums

Problem Delete exactly one entry from nums and close the gap, giving the remaining entries new zero-based indices. Count the original indices whose de...

Coding & AlgorithmsArrays & Strings

Detect Fraud by Propagating Suspicious PII

Detect Fraud by Propagating Suspicious PII Process a stream of underwriting and fraud_flag events in order. Maintain a set of suspicious PII values dr...

Machine Learning Engineer Locked

Design a Personalized Feed and Compare Ranking Objectives

Design a personalized professional feed across data, features, and serving, and compare pointwise, pairwise, and listwise learning-to-rank approaches.

ML System DesignRanking ModelsRecommendation Systems

87 people solved

Sep 9, 2026

AmazonMicrosoftGoogle

Easy

Software Engineer

Recolor the Connected Component of a Pixel

Problem Starting at image[sr][sc], recolor every pixel reachable through side-adjacent pixels of that starting pixel's original color. Diagonal contac...

Coding & AlgorithmsGrids & Matrices

Write Selenium Code That Locates Two Page Elements and Returns Their Text Values

In a QA engineer interview, the coding exercise was: write Selenium code that fetches and returns the text values of two elements on a web page. The e...

Software Engineering FundamentalsTesting & Quality

Software Engineer Locked

Minimum Cars for Rental Requests

You receive rental requests, each with a unique request identifier, pickup time, and return time. Work through the function contract, boundary cases, ...

Coding & AlgorithmsIntervals & SchedulingHeaps & Priority Queues

Software EngineerSenior+ Locked

From a Monorepo Commit to an Over-the-Air Vehicle Update, and Choosing What to Build

Trace everything that happens between an engineer pushing a commit to a monorepo and the resulting software being installed on customers' cars, then e...

System DesignCI/CD & DeploymentGraphs

Implement a Mutual-Exclusion Lock Without Built-In Locks

Implement a lock: a mutual-exclusion primitive with lock() and unlock(). You may not call any existing lock, mutex, semaphore, monitor or condition va...

Software Engineering FundamentalsConcurrencyOperating Systems

Software Engineer Locked

Design a Ledger Recording and Query System

Design an auditable ledger record-and-query subsystem with immutable entries, idempotent writes, consistent balances, reconciliation, and failure reco...

Split n People Into Two Groups So No Pair Who Dislike Each Other Shares a Group

There are n people, labeled from 1 to n, and you want to split them into two groups of any size. Some people dislike others, and a person must not end...

Coding & AlgorithmsGraphs

Implement time-versioned KV store with restore

Design and implement an in-memory key–value store where every operation is associated with a timestamp (monotonically increasing integer). The store m...

Coding & AlgorithmsKey-Value StoresData Structure Design

Present Insights from Course Supply and Participation Data

Present Insights from Course Supply and Participation Data You are given one table showing the current number of courses by category and another showi...

Analytics & ExperimentationBI & Reporting SystemsMetrics & KPIs

Leading an AI-Powered Feature From Problem Discovery Through Launch

Choose an AI-powered feature that you shipped and take the interviewer through it from beginning to end: where the idea came from, how it was built an...

Behavioral & LeadershipProject Deep DiveAI Product Management

Design a single-node persistent in-memory cache

Scenario Design a single-machine in-memory cache used by a web service to serve concurrent read and write requests. This is a deliberately low-level s...

System DesignData Structure DesignConcurrency

Pushing Back on a Decision That Hurt Your Team: Process, Review and Delivery Impact

Tell me about a time when you pushed back against a decision that negatively impacted your team. What was the issue? How did it turn out? This was one...

Behavioral & LeadershipConflict & CollaborationLeadership & Influence

Software EngineerSenior+

Design a URL-Shortening Service

Design a URL-shortening service. Explain how a long URL receives a short identifier, how redirects are served, and how the service preserves correct m...

System DesignSystem Design FundamentalsAPI Design

Design a Loan System with Borrower Repayments and Periodic Investor Payouts

Design the backend of a loan system. Borrowers hold loans and make repayments on them, and the system periodically pays out to the investors who own t...

System DesignPayments & LedgersDistributed Transactions & Idempotency

Implement a CSAT Sliding Window Tracker

Design and implement a class that tracks customer satisfaction scores over a sliding time window. A customer support conversation has: - conversation_...

Coding & AlgorithmsData Structure DesignStacks & Queues

391 people solved

Apr 1, 2026

Goldman SachsMicrosoftGoogle

Medium

Software Engineer

Smallest String Reachable Through Allowed Index Swaps

Problem Each pair gives two zero-based positions whose characters may be swapped any number of times. Return the lexicographically smallest string rea...

Coding & AlgorithmsGraphsSorting

13 people solved

Hudson River Trading

Medium

Site Reliability Engineer Locked

Compare Python Generators, Decorators, and Context Managers

Compare Python generators, decorators, and context managers through their protocols and execution timing, then combine them in a synchronous lazy file...

Software Engineering Fundamentals

192 people solved

Aug 16, 2026

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Tech Interview Questions

Count Deletions that Balance Index-Parity Sums

Detect Fraud by Propagating Suspicious PII

Design a Personalized Feed and Compare Ranking Objectives

Recolor the Connected Component of a Pixel

Write Selenium Code That Locates Two Page Elements and Returns Their Text Values

Minimum Cars for Rental Requests

From a Monorepo Commit to an Over-the-Air Vehicle Update, and Choosing What to Build

Implement a Mutual-Exclusion Lock Without Built-In Locks

Design a Ledger Recording and Query System

Split n People Into Two Groups So No Pair Who Dislike Each Other Shares a Group

Implement time-versioned KV store with restore

Present Insights from Course Supply and Participation Data

Leading an AI-Powered Feature From Problem Discovery Through Launch

Design a single-node persistent in-memory cache

Pushing Back on a Decision That Hurt Your Team: Process, Review and Delivery Impact

Design a URL-Shortening Service

Design a Loan System with Borrower Repayments and Periodic Investor Payouts

Implement a CSAT Sliding Window Tracker

Smallest String Reachable Through Allowed Index Swaps

Compare Python Generators, Decorators, and Context Managers

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