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

Microsoft

Medium

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

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

35 people solved

Aug 28, 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

12 people solved

Google

Medium

Software Engineer Locked

Expand Recursive Key-Value Placeholders in a Template

Expand %KEY% placeholders in a template, recursively resolving placeholders inside mapped values. Use memoized dependency traversal to preserve litera...

Coding & AlgorithmsGraphsParsing & Interpreters

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

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

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...

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

36 people solved

Sep 30, 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

BloombergApplied Intuition

Hard

Software Engineer

Count Hidden Ships Inside a Rectangle

Count Hidden Ships Inside a Rectangle Ships occupy integer-coordinate points on a plane, with at most one ship at any point. Their positions are hidde...

Coding & AlgorithmsBacktracking & RecursionMath & Number Theory

Replace a Range of Nodes in a Linked List with Another Linked List

You are given two singly linked lists, list1 and list2, and two indices i and j. Replace the nodes of list1 numbered i through j (inclusive) with the ...

Coding & AlgorithmsLinked Lists

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 Engineer Locked

Content Safety Filter

This coding question tests string parsing, tokenization logic, and pattern-matching algorithm design in a practical content moderation context. It eva...

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

Design a Data Puller for a Third-Party API Capped at 3 Requests per Second

Design a service that pulls data from a third-party provider's API into your own system and keeps it up to date. The provider enforces a hard rate lim...

System DesignRate LimitingAPI Integration & HTTP Clients

Data ScientistSenior+ Locked

Compare Logistic Regression and Random Forest in Python

Compare logistic regression and random forest for a binary classification problem implemented in Python. Cover preprocessing pipelines, regularization...

Machine LearningSupervised LearningModel Evaluation

Software Engineer Locked

Fastest Rolling One-Kilometer Average Speed from 5-Second Distance Samples

Given the meters a runner covers in each 5-second interval, find the fastest average speed over a rolling one-kilometer stretch, defined as the shorte...

Coding & AlgorithmsTwo Pointers & Sliding Window

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

Build Any Balanced BST from a Strictly Increasing Array

Problem Build a height-balanced binary search tree containing the integers in the strictly increasing array nums. Return its root. A tree is height-ba...

Coding & AlgorithmsTrees

12 people solved

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Tech Interview Questions

Insert Spaces to Rebuild a Sentence from Dictionary Words

Implement a Mutual-Exclusion Lock Without Built-In Locks

Recolor the Connected Component of a Pixel

Expand Recursive Key-Value Placeholders in a Template

Design a URL-Shortening Service

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

Design a Ledger Recording and Query System

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

Smallest String Reachable Through Allowed Index Swaps

Count Hidden Ships Inside a Rectangle

Replace a Range of Nodes in a Linked List with Another Linked List

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

Content Safety Filter

Design a single-node persistent in-memory cache

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

Design a Data Puller for a Third-Party API Capped at 3 Requests per Second

Compare Logistic Regression and Random Forest in Python

Fastest Rolling One-Kilometer Average Speed from 5-Second Distance Samples

Compare Python Generators, Decorators, and Context Managers

Build Any Balanced BST from a Strictly Increasing Array

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