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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
12.1k
Companies
579
Updated
10.10.2026
12.1k Questions 579 Companies10.10.2026
PLTCHK testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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 testimonial
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_ testimonial
_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"

Chris testimonial
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 testimonial
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."

Jake testimonial
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 testimonial
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."

Carlos testimonial
CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes testimonial
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."

Andy testimonial
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 testimonial
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."

Shruti testimonial
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 testimonial
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."

Bianca testimonial
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 testimonial
tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa testimonial
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
Revolut logo
Revolut
Easy
Data Scientist

Define Ultra success metrics and detect suspicious transactions

You work on a fintech product with these existing tables (UTC timestamps). You may only use these tables/columns; if a metric cannot be measured direc...

Analytics & ExperimentationMetrics & KPIsSQL
33
0
306 people solved
Feb 4, 2026
Zoox logo
Zoox
Medium
Software Engineer Locked

Three Array Problems for Trading Geometry and Grouping

Solve three independent array and grouping tasks: one buy/sell profit, a four-value line witness using distinct indices, and deterministic nickname-sa...

Coding & Algorithms
5
0
79 people solved
May 11, 2026
Sig logo
Sig
Easy
Data Scientist

Count Cookie Flavor Combinations

Count Cookie Flavor Combinations You will bake exactly 5 cookies using 4 available flavors. A flavor may be used for any number of cookies, including ...

Statistics & Math
1
0
14 people solved
Aug 16, 2026
Waymo logo
Waymo
Medium
Data Scientist

Implement a Safe Average Function in Python

Write a Python function average(table) that returns the arithmetic mean of a list of numbers and returns 0 when the list is empty. Explain the functio...

Data Manipulation (SQL/Python)
16
0
150 people solved
Mar 14, 2026
Squarepoint logo
Squarepoint
Medium
Software Engineer

Parse payroll file and answer queries

You are given a payroll "file" as a StringIO (file-like) object in Python. The underlying text represents manually-entered payroll data. Assume the fo...

Coding & AlgorithmsData Cleaning & WranglingParsing & Interpreters
10
0
176 people solved
Dec 8, 2025
Versemedical logo
Versemedical
Medium
Software Engineer Locked

Build a Paginated Provider Search Backend and React Filter UI

Build a paginated provider search feature spanning a PostgreSQL query, backend route, and React interface. The question tests safe optional filters, n...

Software Engineering Fundamentals
9
0
64 people solved
Jul 1, 2026
OpenAI logo
OpenAI
Medium
Software Engineer

Clarify and Design Social-Graph Milestones

Clarify and Design Social-Graph Milestones An interview exercise progresses through a social graph with snapshots, a milestone for retrieving follower...

Software Engineering FundamentalsData Structure DesignGraphs
32
0
224 people solved
Jul 17, 2026
Apple logo
Apple
Medium
Frontend Engineer Locked

Explain JavaScript Scope, Closures, Timers, and the Event Loop

Explain JavaScript execution order through scope, closures, host APIs, the event loop, task queues, and microtasks. The interview also examines var ve...

Software Engineering Fundamentals
3
0
57 people solved
Jul 13, 2026
Uber logo
Uber
Medium
Software Engineer

Determine balanced k values in a permutation

You are given a permutation p of the integers 1..n. For a number k (where 1 <= k <= n), call k balanced if there exists a contiguous subarray p[l..r] ...

Coding & AlgorithmsTwo Pointers & Sliding Window
45
0
367 people solved
Feb 11, 2026
Gimlet Labs logo
Gimlet Labs
Medium
Member of Technical Staff, ML Systems

Design CPU-Cycle Window Alignment for Misaligned Time Series

Interview Prompt Design and implement an algorithm that buckets two CPU-cycle time series whose timestamps do not align and produces time windows on a...

Software Engineering Fundamentals
3
0
47 people solved
Apr 15, 2026
Alibaba logo
Alibaba
Medium
Software Engineer

Fixed-Capacity Key-Value Cache That Evicts the Least Recently Used Key

Implement a key-value cache with a fixed capacity. When the cache is full and a new key has to be inserted, the cache evicts the key that was used lea...

Coding & AlgorithmsData Structure DesignLinked Lists
0
0
1 people solved
Oct 7, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer

Design a production RAG system

Question Design a production retrieval-augmented generation (RAG) system for enterprise document QA. Walk through the end-to-end architecture and just...

ML System DesignRetrieval-Augmented GenerationEmbeddings & Vector Search
48
0
468 people solved
Aug 11, 2025
Capital One logo
Capital One
Medium
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
25
0
189 people solved
May 31, 2026
Databricks logo
Databricks
Medium
Software EngineerSenior+

Design Messaging With Message Deletion

Design a real-time messaging application with channels or conversations, message history, and message deletion. Focus especially on how deletion behav...

System Design
11
0
135 people solved
Apr 7, 2026
Google logo
Google
Medium
Software EngineerSenior+ Locked

Build a Custom CompletableFuture: Async Primitive and Parallel Array Processing

This question evaluates a candidate's understanding of concurrency primitives, specifically the internal mechanics of future/promise abstractions such...

Software Engineering FundamentalsConcurrency
27
0
193 people solved
Jun 29, 2026
Wells Fargo logo
Wells Fargo
Hard
Data ScientistIntern

Core Components of an LLM-Based AI Agent and How They Interact

What are the components of an AI agent? Name each component, explain what it does, and show how the components work together when the agent carries ou...

Machine LearningAI AgentsLLM Applications
0
0
1 people solved
Oct 6, 2026
Crusoe logo
Crusoe
Easy
Software Engineer Locked

Design a Slack-Like Messaging Platform

This question evaluates a candidate's competency in designing scalable, low-latency distributed messaging architectures, covering conversation modelin...

System DesignReal-Time SystemsMessaging & Event-Driven
28
0
297 people solved
May 2, 2026
Remitly logo
Remitly
Easy
Software Engineer

Design an IP Address Filtering Service

Design an IP Address Filtering Service Design a service that decides whether network requests should be allowed or denied based on source or destinati...

System DesignApplication SecurityNetworking
15
0
128 people solved
Apr 14, 2026
Google logo
Google
Medium
Software EngineerSenior+ Locked

Implement Multi-Player Tic-Tac-Toe

Implement multi-player Tic-Tac-Toe on a configurable board with strict turn order, validated moves, and a fixed three-mark win condition. Define exact...

Coding & AlgorithmsLow-Level Design (OOP)Simulation & State Machines
13
0
127 people solved
Jul 17, 2026
Microsoft logo
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
0
0
8 people solved
Aug 27, 2026
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