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

Patreon

Easy

Data Engineer

Design a Data Processing System for JSON User Records: Batch vs Streaming Input

Your team receives user records as JSON. Each record holds personal data such as a name, a mailing address and one or more payment methods. The round ...

System DesignETL & Data PipelinesBatch & Stream Processing

Software EngineerSenior+ Locked

Find the Lexicographically Maximum Suffix

Return the lexicographically greatest nonempty substring of a lowercase string with up to 400,000 characters. Respect standard prefix ordering without...

Coding & Algorithms

61 people solved

Aug 21, 2026

GoogleAmazonBloomberg

Medium

Software Engineer

Count All Three Salary Categories Including Empty Ones

Problem Return category and accounts_count for all three source categories: Low Salary for income < 20000, Average Salary for 20000 through 50000 incl...

Data Manipulation (SQL/Python)SQL

15 people solved

Microsoft

Medium

Applied ScientistSenior+

Fewest Distinct Values to Delete So at Least Half the Array Is Removed

Given an integer array arr of length n, pick a set of distinct values and delete every occurrence of each picked value from the array. A set is enough...

Coding & AlgorithmsGreedyArrays & Strings

Check JavaScript Prototype Ancestry

Check JavaScript Prototype Ancestry Implement checkIfInstanceOf(obj, classFunction), returning a Boolean that reports whether a value has a specified ...

Coding & AlgorithmsJavaScript & TypeScript

Fewest Insertions When Each Opening Requires a Consecutive Closing Pair

Problem A balanced string is empty,a concatenation of balanced strings,or "("+A+"))" for balanced A. Thus each opening parenthesis must be matched by ...

Coding & AlgorithmsGreedyStacks & Queues

10 people solved

eBay

Medium

Software Engineer Locked

Return the K Smallest Values from Sorted Arrays

Return the requested number of smallest values across multiple sorted arrays while preserving duplicates. The question evaluates frontier-based mergin...

Maximum Cherries Collected by Two Descending Robots

Problem Two robots start at(0,0) and(0,cols-1) of grid. Each step moves to the next row, changing its column by -1,0,or 1 while remaining inside the g...

Coding & AlgorithmsDynamic ProgrammingGrids & Matrices

7 people solved

Yelp

Easy

Data Scientist Locked

Estimate Experiment Duration with Power Analysis

Estimate A/B test sample size and duration for a binary metric. Connect alpha, power, baseline rate, and minimum detectable effect to traffic, trigger...

Analytics & Experimentation

Machine Learning Engineer

Design a Resumable Iterator with Checkpoint and Restore

Design a resumable iterator: an iterator that can serialize its current position into a compact, opaque checkpoint and later be reconstructed from tha...

Software Engineer Locked

Sum Pairwise Remainders Across Two Integer Ranges

Sum every remainder produced by pairing an integer in one inclusive range with each valid divisor in another. This algorithmic exercise emphasizes quo...

Software EngineerSenior+

Design a Secure, Highly Available Real-Time Event Messaging Platform and Defend It

This is a take-home system design followed by a live review. You receive a written set of requirements, design a real-time event messaging system on y...

System DesignMessaging & Event-DrivenFault Tolerance & Failover

Software Engineer Locked

Design a Scheduler for ML Training and Batch Inference Jobs

Design a scheduler for training, batch inference, and lower-priority evaluation jobs across shared compute resources. Model workload-specific needs, a...

Design a Payment Fraud Detection Service

Design a real-time fraud detection service for a payment platform. When a user submits a payment attempt, the platform calls your service before autho...

System DesignSystem Design FundamentalsPayments & Ledgers

Software Engineer Locked

Convert an IP range to minimal CIDRs

This question evaluates understanding of IPv4 address encoding, binary and bitwise operations, and optimal interval covering for expressing consecutiv...

Design a Scalable Job Scheduler

Design an internal job scheduling platform for a large company. The platform lets internal services and engineers submit jobs that run at a specified ...

System DesignJob Scheduling & WorkflowsDistributed Coordination

513 people solved

Apr 8, 2026

SalesforceExpediaNVIDIA

Medium

Software Engineer

Reduce Piles with Repeated Half Removals

Problem Perform exactly k operations on the stone piles. In each operation, choose any pile and remove floor(pileSize/2) stones from its current conte...

Coding & AlgorithmsHeaps & Priority QueuesGreedy

Build a Paging Card Carousel in UIKit with Dataset Switching and Auto-Scroll

In an iOS coding round you build a small app from scratch in Xcode. The interviewer first shows a demo of a horizontally swipeable card carousel; you ...

Software Engineering FundamentalsiOS

Machine Learning Engineer Locked

Compare DCN v1 vs v2 and A/B test

This question evaluates understanding of deep learning model architectures (DCN v1 vs v2), feature interaction modeling, production training and servi...

Machine LearningCTR Prediction & Ads MLExperiment Design (A/B Testing)

Shortest Four-Direction Route With an Obstacle Budget

Problem In the binary grid, 0 is empty and 1 is an obstacle. Starting at the empty top-left cell, move up,down,left or right one cell per step. You ma...

Coding & AlgorithmsGrids & MatricesGraphs

11 people solved

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Tech Interview Questions

Design a Data Processing System for JSON User Records: Batch vs Streaming Input

Find the Lexicographically Maximum Suffix

Count All Three Salary Categories Including Empty Ones

Fewest Distinct Values to Delete So at Least Half the Array Is Removed

Check JavaScript Prototype Ancestry

Fewest Insertions When Each Opening Requires a Consecutive Closing Pair

Return the K Smallest Values from Sorted Arrays

Maximum Cherries Collected by Two Descending Robots

Estimate Experiment Duration with Power Analysis

Design a Resumable Iterator with Checkpoint and Restore

Sum Pairwise Remainders Across Two Integer Ranges

Design a Secure, Highly Available Real-Time Event Messaging Platform and Defend It

Design a Scheduler for ML Training and Batch Inference Jobs

Design a Payment Fraud Detection Service

Convert an IP range to minimal CIDRs

Design a Scalable Job Scheduler

Reduce Piles with Repeated Half Removals

Build a Paging Card Carousel in UIKit with Dataset Switching and Auto-Scroll

Compare DCN v1 vs v2 and A/B test

Shortest Four-Direction Route With an Obstacle Budget

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