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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 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
Figure logo
Figure
Easy
Software Engineer

Design a Multimodal Training Data Pipeline

Design a backend system for collecting, filtering, and storing training data sent by many clients. Clients upload records that may include large media...

ML System Design
4
0
53 people solved
Apr 2, 2026
Google logo
Google
Medium
Software EngineerSenior+

Design set with O(1) random access

Design a data structure ("FancySet") that stores unique integers and supports the following operations, each in average O(1) time: - add(x): Insert va...

Coding & AlgorithmsData Structure Design
17
0
202 people solved
Jan 1, 2026
C3 AI logo
C3 AI
Medium
Software EngineerNew Grad

Maximum-Sum Star with at Most K Arms

Given a simple undirected graph with an integer value on each node and an integer k, return the largest node-value sum of any nonempty star subgraph w...

Coding & AlgorithmsGraphsGreedy
1
0
22 people solved
Jan 23, 2026
Roblox logo
Roblox
Medium
Data Scientist

Implement streaming CTR with deduplication

Implement a Python function to compute streaming, per-campaign CTR over a sliding 24-hour window with click de-duplication and late-arriving events. R...

Coding & AlgorithmsBatch & Stream ProcessingArrays & Strings
12
0
123 people solved
Oct 13, 2025
Shopify logo
Shopify
Easy
Software Engineer

Simulate rover movement on a grid

You are building a rover navigation simulator. The exercise is incremental: you implement a single rover on a 2D grid, then extend the design to many ...

Coding & AlgorithmsSimulation & State MachinesLow-Level Design (OOP)
75
1
652 people solved
Jan 27, 2026
Valon logo
Valon
Easy
Software Engineer Locked

Design employee and company classes with tests

This question evaluates object-oriented design, API modeling, and unit testing competencies by requiring an Employee and Company model, CRUD operation...

Software Engineering FundamentalsLow-Level Design (OOP)Testing & Quality
20
0
188 people solved
Jan 20, 2026
Harvey logo
Harvey
Medium
Software Engineer

Handle multi-source string matching and tagging

Question Given an LLM output string and a list of source strings, design an algorithm to count how many times each source appears in the output. Exten...

Coding & Algorithms
27
0
181 people solved
Jul 29, 2025
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Design a Text-to-Video Generation Service

This question evaluates understanding of ML system design, distributed scheduling, durable asynchronous job pipelines, GPU resource orchestration, and...

ML System DesignGPU InfrastructureJob Scheduling & Workflows
16
0
176 people solved
May 22, 2026
OpenAI logo
OpenAI
Hard
Machine Learning Engineer

Design a regional surge pricing strategy

Scenario You operate a ride-hailing platform. You need to design a system that sets surge multipliers (dynamic pricing) for a given region. Task Desig...

System DesignML System Design
43
0
304 people solved
Dec 15, 2025
Uber logo
Uber
Hard
Software Engineer

Check if each prefix forms 1..k permutation

You are given an integer array arr of length n that is a permutation of the numbers 1..n (each number appears exactly once), but in arbitrary order. F...

Coding & AlgorithmsArrays & Strings
27
0
276 people solved
Feb 11, 2026
Yelp logo
Yelp
Easy
Data Scientist Locked

Estimate Experiment Duration with Power Analysis

Estimate A/B test sample size and duration for a binary metric. Connect alpha, power, baseline rate, and minimum detectable effect to traffic, trigger...

Analytics & Experimentation
2
0
19 people solved
Aug 27, 2026
Amazon logo
Amazon
Medium
Software Engineer Locked

Find and Fix the Root Cause of a Problem

Describe how you found and fixed a problem's root cause by tracing symptoms through competing hypotheses and evidence to the causal chain, recovery pr...

Behavioral & Leadership
1
0
22 people solved
Aug 16, 2026
Datadog logo
Datadog
Medium
Software Engineer

Implement log storage and querying

Design a data structure to record log entries and support efficient queries. Each log has a timestamp (milliseconds), severity (INFO/WARN/ERROR), serv...

Coding & Algorithms
9
0
122 people solved
Sep 6, 2025
Two Sigma logo
Two Sigma
Hard
Data ScientistIntern Locked

Why use the t-statistic?

This question evaluates understanding of the t-statistic as a standardized test measure connecting effect size, variance, and sample size, and probes ...

Statistics & MathHypothesis TestingSampling & Estimation
16
0
151 people solved
Apr 2, 2026
Google logo
Google
Hard
Software Engineer

Design quota enforcement for high concurrency

System Design: Quota Enforcement Service at Very High QPS Context You are designing a multi-tenant quota and rate-limiting service used by many backen...

System DesignRate LimitingAPI Design
17
0
172 people solved
Sep 6, 2025
DoorDash logo
DoorDash
Hard
Software Engineer

Deep-dive a project architecture

Question Pick one of your recent, non-trivial projects and conduct a deep, end-to-end technical review. This is an open-ended architecture deep-dive: ...

System DesignProject Deep DiveSystem Design Fundamentals
30
0
424 people solved
Jul 31, 2025
Pinterest logo
Pinterest
Hard
Data Scientist Locked

Design and Interpret a Video Pin Experiment

Design and interpret an experiment intended to increase video Pin creation while protecting content quality. Evaluate randomization, metric definition...

Analytics & ExperimentationExperiment Design (A/B Testing)Experiment Analysis & Readout
11
0
95 people solved
May 17, 2026
Meta logo
Meta
Medium
Software Engineer

Find kth largest element in array

Question Given an unsorted array of integers nums and an integer k, return the k-th largest element in the array. The 1st largest element is the maxim...

Coding & Algorithms
7
0
107 people solved
Dec 8, 2025
Uber logo
Uber
Medium
Data Scientist

Design Pricing Model Experiment

You work as a data scientist for a ride-hailing marketplace. The company wants to launch a new pricing model that may change the price shown to riders...

Analytics & ExperimentationExperiment Design (A/B Testing)Metrics & KPIs
8
1
133 people solved
Mar 28, 2026
Airbnb logo
Airbnb
Medium
Software Engineer

Implement Connect Four with win detection

Implement a Connect Four game engine. Support a general m×n board (default 6× 7) and a win condition of k in a row (default 4). Provide an API: Connec...

Coding & AlgorithmsSimulation & State MachinesGrids & Matrices
30
0
194 people solved
Jul 31, 2025
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