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

Airbnb

Hard

Data Scientist

Estimate impact of global launch without holdout

Causal Lift Plan After a Global Launch Without a Holdout Background A new product feature was launched globally on 2025-05-10, with no control or hold...

Analytics & ExperimentationCausal InferenceLaunch Evaluation

Design scalable inventory system and avoid races

System Design: Scalable, Highly Available Inventory Management Context Design an inventory management system for a high-traffic e-commerce platform th...

System DesignTransactions & IsolationDistributed Transactions & Idempotency

Machine Learning Engineer

Implement attention and Transformer with backward pass

Implement Scaled Dot-Product Attention and a Transformer Block (No Autograd) Context: Build multi-head self-attention and a Transformer encoder-style ...

Machine LearningML CodingTransformers & Attention

Maximize profit with transaction fees

You are given an array prices where prices[i] is the price of a stock on day i and an integer fee representing the commission charged when you sell. Y...

Coding & AlgorithmsDynamic Programming

Answer SQL MCQs with reasoning

Answer multiple-choice questions covering SQL topics: INNER vs LEFT vs RIGHT JOIN semantics; GROUP BY and HAVING; NULL handling in comparisons and agg...

Data Manipulation (SQL/Python)

Design elevator scheduling for small building

Design elevator scheduling for small building Design the control policy for a single elevator serving a small building: 3 floors plus 1 basement (stop...

System DesignSimulation & State MachinesSystem Design Fundamentals

Risk Technology Software EngineerSenior+ Locked

Find a Target Sum Using Two Sorted Arrays

Determine whether two sorted arrays contain one value each that sum to a target using opposite-end pointers and overflow-safe arithmetic.

Versioned Key-Value Store with Nested Transactions (Begin, Commit, Rollback)

Implement an in-memory versioned key-value database that supports transactional writes with three transaction-control operations: begin (start a trans...

Present and defend your data challenge end-to-end

10–12 Minute Interviewer-Driven Walkthrough: Recent Data Challenge Provide a concise, structured walkthrough of a real project you led end-to-end. Ass...

Design a multi-timer using single underlying timer

You are given a Timer class that has access to a single underlying system timer API that can only keep one active timer at a time. Underlying single-t...

Software Engineering FundamentalsHeaps & Priority QueuesData Structure Design

Software Engineer Locked

Implement multiple coding round problems

This multi-part question evaluates algorithmic problem-solving skills including efficient lookup/search, stable ordering and priority management, stre...

Coding & AlgorithmsParsing & InterpretersBinary Search

Implement Python Function for Longest Unique Substring Length

Scenario Real-time text analytics service enforcing uniqueness constraints Question Implement a Python function returning the length of the longest su...

Connect Points With Minimum Total Distance

This question evaluates a candidate's competency in graph modeling, geometric distance metrics, and algorithmic complexity analysis for optimizing tot...

Software EngineerSenior+ Locked

Design a Distributed Cron Job Scheduler

Design a distributed cron scheduler that creates recurring runs, dispatches work, tracks attempts, and recovers from crashes and partitions. Address d...

Software EngineerSenior+ Locked

Implement store, evaluator, and parser

This question evaluates implementation skills in data structures and algorithms, covering time-based versioning and TTL in an in-memory key-value stor...

Coding & AlgorithmsKey-Value StoresParsing & Interpreters

Design Slack-like chat system

Question Design the chat subsystem for an app like Slack/Discord. State your assumptions (scale, retention, consistency needs) and propose an end-to-e...

System DesignReal-Time SystemsStorage & Sharding

Data ScientistSenior+

Calculate Monthly Customer Retention

Calculate Monthly Customer Retention Write one PostgreSQL SELECT statement or CTE query. Do not create, alter, or modify tables. Schema orders | colum...

Data Manipulation (SQL/Python)

Design Siri-vs-GPT query routing

You are a Data Scientist at Apple designing a feature that decides whether a user's natural-language query should be routed to Siri or to a GPT-based ...

Machine LearningML System DesignModel Evaluation

Software EngineerSenior+ Locked

Defend the Trade-Offs in One Project

Defend the major trade-offs in one project by connecting original constraints, architecture, alternatives, evidence, implementation details, and what ...

Behavioral & Leadership

Compute maximum sum in a tree without adjacency

Given a tree where each node has an integer value, select a subset of nodes to maximize the sum under the constraint that if you choose a node, you ca...

Coding & AlgorithmsDynamic Programming

253 people solved

Aug 12, 2025

Tech Interview Questions

Estimate impact of global launch without holdout

Design scalable inventory system and avoid races

Implement attention and Transformer with backward pass

Maximize profit with transaction fees

Answer SQL MCQs with reasoning

Design elevator scheduling for small building

Find a Target Sum Using Two Sorted Arrays

Versioned Key-Value Store with Nested Transactions (Begin, Commit, Rollback)

Present and defend your data challenge end-to-end

Design a multi-timer using single underlying timer

Implement multiple coding round problems

Implement Python Function for Longest Unique Substring Length

Connect Points With Minimum Total Distance

Design a Distributed Cron Job Scheduler

Implement store, evaluator, and parser

Design Slack-like chat system

Calculate Monthly Customer Retention

Design Siri-vs-GPT query routing

Defend the Trade-Offs in One Project

Compute maximum sum in a tree without adjacency

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