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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 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
Amazon logo
Amazon
Medium
Data Scientist

Compute an A/B test p-value by hand

In an A/B test on a game feature, you measure conversion rate (binary outcome). - Control: n₁ = 1000 users, x₁ = 120 conversions - Treatment: n₂ = 980...

Statistics & MathHypothesis TestingExperiment Design (A/B Testing)
16
0
128 people solved
Nov 4, 2025
Medium
Quantitative Researcher

Choose a Numbered Deck Against an Optimal Repeated Guesser

Build a deck using any number of copies of cards labeled 1 through 5. An opponent knows its composition. Each round, the opponent names a number i and...

Statistics & MathPuzzles & BrainteasersProbability
1
0
16 people solved
Jun 2, 2026
Point72 logo
Point72
Medium
Machine Learning Engineer Locked

Design Features for Residual Volatility

This question evaluates competency in feature engineering for financial time-series, volatility forecasting after removing systematic market effects, ...

Machine Learning
6
0
79 people solved
Apr 14, 2026
Upstart logo
Upstart
Medium
Data Scientist

Estimate Family Proportions and Explain Regression Anomalies

Estimate Family Proportions and Explain Regression Anomalies On-site Statistics Round Task Overview You are given a population of families that have e...

Statistics & MathSampling & EstimationRegression & Statistical Modeling
89
0
272 people solved
Aug 4, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Implement LRUCache with O(1) Operations and Thread Safety

Scenario High-traffic API needs constant-time eviction cache. Question Implement an LRUCache supporting get(key) and put(key,val) in O( 1). Describe ...

Coding & Algorithms
20
0
102 people solved
Jul 12, 2025
Meta logo
Meta
Medium
Software EngineerSenior+ Locked

Solve Tree Diameter and Palindromic Counts

This two-problem prompt evaluates proficiency in tree algorithms and recursion for computing longest paths in binary trees, along with string processi...

Coding & Algorithms
5
0
39 people solved
May 21, 2026
Roku logo
Roku
Medium
Backend Engineer Locked

Explain concurrency and distributed fundamentals

This question evaluates understanding of concurrency and synchronization in multithreaded Java, Java hashing and equals/hashCode semantics, garbage co...

Software Engineering FundamentalsConcurrencyMemory Management
11
0
105 people solved
Feb 25, 2026
Pinterest logo
Pinterest
Medium
Machine Learning Engineer Locked

Solve prefix, array, and string problems

This set of problems evaluates proficiency in string and array algorithm design—covering prefix search, subsequence matching, and maximal-area computa...

Coding & Algorithms
8
0
61 people solved
Apr 9, 2025
ByteDance logo
ByteDance
Medium
Software Engineer

Find Maximum Candies With Two Types

You are given a row of candies represented by an array candies, where candies[i] is the type of the candy at position i. You may choose any starting p...

Coding & Algorithms
3
0
47 people solved
Apr 22, 2026
Dropbox logo
Dropbox
Medium
Product Manager

Driverless Vehicle Hire: Renter Journey, Feature Priorities and Success Metrics

Imagine a rental service whose cars drive themselves. Design the experience of renting one of these cars, from booking it to giving it back. Choose th...

Product Design & StrategyProduct SenseMetrics & KPIs
1
0
9 people solved
Dec 21, 2025
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Design an SSH-Based Cloud Development Environment

Design an SSH-accessed cloud development platform with persistent workspaces and scheduled build, test, and run tasks. Work through identity, host pla...

System Design
10
0
78 people solved
Jun 25, 2026
Robinhood logo
Robinhood
Medium
Software Engineer

Walk through project scope, ownership, and decisions

Walk through project scope, ownership, and decisions Behavioral: Walk Through a Significant Project (Technical Screen — Software Engineer) Provide a d...

Behavioral & LeadershipProject Deep DiveOwnership & Execution
19
0
193 people solved
Aug 7, 2025
DoorDash logo
DoorDash
Medium
Data Scientist

Investigate Pop-up Impact on Partner Referral Conversions

Investigate Pop-up Impact on Partner Referral Conversions Partner-Referral Conversions Fell After App Pop-up: Diagnose, Quantify, and Decide Context Y...

Analytics & ExperimentationExperiment Design (A/B Testing)Causal Inference
12
0
135 people solved
Aug 4, 2025
Microsoft logo
Microsoft
Medium
Software Engineer

Find lowest common ancestor in tree

You are given the root of a binary search tree (BST) and two distinct nodes p and q that are guaranteed to exist in the tree. Task (BST case): - Find ...

Coding & Algorithms
8
0
78 people solved
Nov 19, 2025
TikTok logo
TikTok
Medium
Software Engineer

Design LRU cache with O(1) operations

Design and implement an in-memory cache that evicts the least recently used entry when capacity is reached. Support get(key) and put(key, value) in O(...

Coding & Algorithms
5
0
47 people solved
Sep 6, 2025
Walmart Labs logo
Walmart Labs
Medium
Software Engineer Locked

Check whether brackets are balanced

This question evaluates a candidate's competency in string processing and bracket-matching concepts, testing familiarity with linear-time algorithms a...

Coding & Algorithms
9
0
69 people solved
Mar 1, 2026
NVIDIA logo
NVIDIA
Hard
Data Scientist

Design and secure a REST inference API

Design a REST API for Image Inference with Grad-CAM You are designing a public REST API for an image-inference service that accepts large images and r...

Coding & Algorithms
6
0
96 people solved
Oct 13, 2025
Microsoft logo
Microsoft
Medium
Software Engineer Locked

Design an Event Booking System

This question evaluates system architecture, distributed systems, data modeling, concurrency control for seat inventory, transactional integrity for b...

System Design
4
0
79 people solved
Feb 22, 2026
Upstart logo
Upstart
Easy
Data Scientist

Assess Probability of Heads in Coin Tosses

Assess Probability of Heads in Coin Tosses Probability with Coin Tosses and the Normal Distribution Context Onsite data scientist screening question a...

Statistics & MathProbability
33
0
120 people solved
Aug 4, 2025
Expedia logo
Expedia
Hard
Software Engineer

How do you learn new knowledge quickly?

Behavioral questions 1. How do you learn new knowledge/technology quickly? Provide a concrete example. 2. What was the most challenging project you wo...

Behavioral & Leadership
6
0
92 people solved
Jan 6, 2026
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