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

Jane Street

Medium

Machine Learning Engineer

Connect-N on an Infinite Board with Gravity

You are asked to implement a variant of the classic Connect Four game, played on an unbounded board. Game Rules - The board consists of vertical colum...

Implement a persistent sharded key-value store

Problem Implement a simple key–value store that persists data on disk. You must store the data in fixed-size shards, where each shard is saved in one ...

Coding & AlgorithmsKey-Value Stores

Software Engineer Locked

Process Calendar Events with Deletion, Pagination, and Overlap Queries

Practice implementing an in-memory calendar that supports inserts, deletions, stable ordering, zero-based pagination, and half-open interval overlap q...

Decide Whether a Parenthesis String With Star Wildcards Can Be Balanced

Given a string made only of the characters (, ) and `, decide whether it can be turned into a balanced parenthesis string by replacing every , indepen...

Coding & AlgorithmsGreedy

Software Engineer Locked

Design a Multi-Service Workflow Engine

Design a locally runnable workflow engine made of collaborating services, with durable state, retries, idempotency, and failure recovery.

Applied ScientistSenior+

Insert Spaces to Rebuild a Sentence from Dictionary Words

You are given a string s whose spaces were lost and a list of dictionary words. Insert spaces into s so that it splits into a sequence of words that a...

Coding & AlgorithmsDynamic ProgrammingString Algorithms

Quantitative Researcher Locked

Maintain a Fixed-Window Rolling Mean in Constant Time

Implement rolling_means(values, window) for signed integer values, returning a double-precision mean for every complete consecutive window. Work throu...

Design an Online Tic-Tac-Toe Service with REST-Only APIs, Matchmaking and Multi-Region

Design an online Tic-Tac-Toe game. Two players are paired through online matchmaking and then play a game against each other, each from their own devi...

System DesignMultiplayer Game SystemsAPI Design

27 people solved

Aug 4, 2026

GoogleAmazonBloomberg

Easy

Software Engineer

Count Exam Attendance for Every Student-Subject Pair

Problem Return student_id, student_name, subject_name and attended_exams for every combination of a Students row and a Subjects row. Count all matchin...

Data Manipulation (SQL/Python)SQL

Solve Five OA Coding Tasks

This is an online-assessment screen consisting of five independent coding tasks. Each task is self-contained — there is no shared state between them —...

Coding & AlgorithmsArrays & StringsMath & Number Theory

Machine Learning EngineerSenior+ Locked

Diagnose a Production Classifier and Defend Its Systems Design

A production machine-learning troubleshooting and system-design interview focused on diagnosing a classifier whose offline and online behavior do not ...

Machine Learning Engineer Locked

Compare Batch Normalization and Layer Normalization

Compare batch and layer normalization by their axes, learned parameters, running statistics, batch-size effects, and training-to-inference debugging.

Machine LearningNeural Networks & TrainingDebugging

Design More Accurate Live Order Tracking and Arrival Estimates for DoorDash

You are a product manager at DoorDash. Design a feature that helps customers follow their orders in real time with better accuracy. Explain which cust...

Product Design & StrategyProduct Design & ImprovementMetrics & KPIs

Software EngineerSenior+ Locked

Design a Low-Latency Metrics and Alerting Platform

Design a multi-tenant metrics and alerting platform for time-series ingestion, dashboards, SLO evaluation, and notifications with critical detection u...

System DesignObservabilityStorage & Sharding

Machine Learning Engineer

ML Concepts: Overfitting, Bias-Variance Trade-off, Class Imbalance, Missing Data

A machine learning knowledge round consisted of standard concept questions: overfitting and underfitting, the bias-variance trade-off, class imbalance...

Machine LearningML FundamentalsFeature Engineering

Software EngineerSenior+ Locked

Determine Whether One Point Can Reach Another

Determine whether a target point with positive integer coordinates can be reached from a starting point using two coordinate-addition moves. Account f...

Decide Whether Letter-Variable Equalities and Inequalities Are Consistent

Problem Each four-character equation has the form x==y or x!=y, with lowercase single-letter variables that may be the same letter. Return whether int...

Coding & AlgorithmsGraphs

11 people solved

Rippling

Medium

Backend EngineerSenior+ Locked

Senior Backend Hiring Manager Deep Dive: Idempotency, SLAs, Changed Decisions, and Pushback

Senior backend hiring manager round covering your proudest project with deep dives on idempotency and SLA definition and monitoring, a technical decis...

Behavioral & LeadershipProject Deep DiveAmbiguity & Decision Making

Software Engineer Locked

Design a Multi-Organization Advertising Platform with Performance Statistics

Design ad management, serving, event collection, deduplicated statistics, and fair performance comparisons across organizations and campaigns.

System DesignAds SystemsBatch & Stream Processing

Maximize weighted subsequence pairs with wildcards

You are given a string s of length n consisting only of characters '0', '1', and '!'. Each '!' can be replaced by either '0' or '1'. For the final bin...

Coding & AlgorithmsDynamic Programming

135

1209 people solved

Jan 27, 2026

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Tech Interview Questions

Connect-N on an Infinite Board with Gravity

Implement a persistent sharded key-value store

Process Calendar Events with Deletion, Pagination, and Overlap Queries

Decide Whether a Parenthesis String With Star Wildcards Can Be Balanced

Design a Multi-Service Workflow Engine

Insert Spaces to Rebuild a Sentence from Dictionary Words

Maintain a Fixed-Window Rolling Mean in Constant Time

Design an Online Tic-Tac-Toe Service with REST-Only APIs, Matchmaking and Multi-Region

Count Exam Attendance for Every Student-Subject Pair

Solve Five OA Coding Tasks

Diagnose a Production Classifier and Defend Its Systems Design

Compare Batch Normalization and Layer Normalization

Design More Accurate Live Order Tracking and Arrival Estimates for DoorDash

Design a Low-Latency Metrics and Alerting Platform

ML Concepts: Overfitting, Bias-Variance Trade-off, Class Imbalance, Missing Data

Determine Whether One Point Can Reach Another

Decide Whether Letter-Variable Equalities and Inequalities Are Consistent

Senior Backend Hiring Manager Deep Dive: Idempotency, SLAs, Changed Decisions, and Pushback

Design a Multi-Organization Advertising Platform with Performance Statistics

Maximize weighted subsequence pairs with wildcards

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