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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
Anthropic logo
Anthropic
Medium
Software Engineer Locked

Time-Based Key-Value Store

This question evaluates the ability to design a data structure that supports versioned storage and efficient point-in-time lookups. It tests binary se...

Coding & Algorithms
7
0
55 people solved
Jun 23, 2026
Tradedesk logo
Tradedesk
Medium
Frontend Engineer

Object-Oriented Design of an Elevator Control System

Design an elevator control system using object-oriented design. Identify the classes and their responsibilities, show how a button press becomes an el...

Software Engineering FundamentalsLow-Level Design (OOP)Simulation & State Machines
1
0
14 people solved
Sep 15, 2026
Airbnb logo
Airbnb
Medium
Data Scientist

Design a network-aware Wi‑Fi badge experiment

You work on a two‑sided travel search marketplace and product wants to add a “High Wi‑Fi” badge/filter in the search bar to help remote workers. Recom...

Analytics & ExperimentationExperiment Design (A/B Testing)Causal Inference
43
0
308 people solved
Oct 13, 2025
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Design an AI playground editor

This question evaluates full-stack system design competencies including real-time response streaming, rich-text editor data modeling, backend APIs, pe...

System DesignSystem Design FundamentalsLLM Applications
29
0
331 people solved
Apr 2, 2026
Cloudflare logo
Cloudflare
Medium
Software Engineer

Design an encrypted key-value store with login

Prompt Design a small key–value store that supports user login and ensures values are encrypted at rest using a user-provided password. You may assume...

Software Engineering FundamentalsKey-Value StoresCryptography
9
0
119 people solved
Oct 4, 2025
Discord logo
Discord
Hard
Software EngineerSenior+

Implement User Sessionization From Event Stream

You are building a backend data-processing component that consumes a stream of newline-delimited JSON events. Each event represents a user sending a m...

Coding & Algorithms
14
0
157 people solved
Dec 16, 2025
Upstart logo
Upstart
Easy
Software Engineer Locked

Report Where a Value Appears

Report four flags showing whether a target appears at an even index, an odd index, in the first half, and in the second half of an even-length list. U...

Coding & Algorithms
4
0
42 people solved
Jul 5, 2026
J.P. Morgan logo
J.P. Morgan
Medium
Software Engineer II Locked

Explain a Project Architecture End to End

Walk through a real project architecture from trigger to output, including interfaces, data ownership, operations, failure handling, personal contribu...

System Design
1
0
25 people solved
Aug 8, 2026
NVIDIA logo
NVIDIA
Easy
Software Engineer

Return all file paths via DFS

You are given an in-memory representation of a file system as a tree. Each node has: - name (string) - isFile (boolean) - children (list of nodes, emp...

Coding & AlgorithmsTrees
26
0
186 people solved
Mar 4, 2026
Citadel logo
Citadel
Medium
Software Engineer

Design a Thread-Safe Shared Counter

Design and implement a per-key call counter: a component that tracks how many times each distinct key has been seen. The API is a single method, for e...

Software Engineering FundamentalsConcurrencyData Structure Design
31
1
483 people solved
Mar 7, 2026
Shopify logo
Shopify
Medium
Software Engineer AI Locked

Scaling a Collision-Free Rover Fleet to a Million Robots

This system design question evaluates a candidate's ability to scale a stateful, invariant-preserving service across distributed machines, using a sha...

System DesignDistributed CoordinationDistributed Transactions & Idempotency
14
0
199 people solved
Jun 13, 2026
Rippling logo
Rippling
Hard
Software Engineer

Design poker-like hand comparison with custom ranking

Problem Design an object-oriented solution to compare two players' hands in a card game similar to poker. You are given two hands (each a fixed number...

Software Engineering FundamentalsLow-Level Design (OOP)
109
0
833 people solved
Oct 22, 2025
DoorDash logo
DoorDash
Hard
Software Engineer Locked

Explain Why You Are Changing Roles

Craft a credible, respectful reason for changing roles that links proven experience with specific growth and ownership goals.

Behavioral & Leadership
2
0
26 people solved
Sep 1, 2026
Box logo
Box
Hard
Software Engineer

Implement a leaky-bucket rate limiter

Implement a leaky-bucket rate limiter Implement a Leaky-Bucket Rate Limiter with Tests and Distributed Design Context and Assumptions - Implement in a...

Coding & AlgorithmsRate LimitingConcurrency
59
0
412 people solved
Aug 1, 2025
Rippling logo
Rippling
Medium
Software Engineer

Design delivery driver payment system

Design a delivery-driver payment system Design and implement an in-memory, object-oriented service that tracks delivery-driver work and computes payro...

System DesignLow-Level Design (OOP)Payments & Ledgers
128
1
1752 people solved
Jul 29, 2025
C3 AI logo
C3 AI
Hard
Data Scientist Locked

Compare PCA and Autoencoders Under the Curse of Dimensionality

Compare PCA and autoencoders through the curse of dimensionality. Cover sparse neighborhoods, linear versus nonlinear compression, leakage-safe evalua...

Machine Learning
1
0
22 people solved
Aug 21, 2026
Applied Intuition logo
Applied Intuition
Medium
Software Engineer Locked

Parse a protobuf-like schema and answer queries

This question evaluates proficiency in parsing grammar-like schemas, scope-based name resolution for nested types, symbol-table construction, and desi...

Coding & Algorithms
8
0
70 people solved
Jan 8, 2026
Databricks logo
Databricks
Hard
Software Engineer Locked

Design Snapshot Set Iteration and Clarify Durable Writes

Design a mutable set whose iterators preserve an exact, deterministic creation-time snapshot, then frame the missing requirements for a separate durab...

Software Engineering FundamentalsData Structure DesignSystem Design Fundamentals
31
0
317 people solved
Jul 26, 2026
Instacart logo
Instacart
Medium
Software Engineer

Make a Variable Resolver Safe for Production Use

A variable resolver accepts definitions whose right-hand sides are either integer literals or other variable names. Discuss its time complexity and ho...

Software Engineering FundamentalsCode Quality & MaintainabilityGraphs
1
0
17 people solved
Sep 11, 2026
Upstart logo
Upstart
Medium
Software Engineer Locked

Sum Multiples of Three, Five, or Seven

Compute the sum of distinct positive integers below a limit that are divisible by three, five, or seven. Account for values shared by several divisor ...

Coding & AlgorithmsMath & Number Theory
15
1
107 people solved
Jul 27, 2026
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