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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
357
Companies
980
Updated
11.10.2026
357 Questions 980 Companies11.10.2026
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
Mercor logo
Mercor
Hard
Software Engineer Locked

Compare Merge Sort with Factorial and Randomized Inefficient Sorts

Explain merge sort, adaptive merging, permutation sorting, and random-shuffle sorting while distinguishing expected complexity from worst-case guarant...

Software Engineering FundamentalsSorting
5
0
84 people solved
Sep 3, 2026
Bloomberg logo
Bloomberg
Medium
Software Engineer

Design a Card Deck with Shuffling, Dealing, and Five-Card Poker Comparison

Design an object-oriented playing-card system that can shuffle a deck, deal cards, and compare the strength of two five-card poker hands. Explain the ...

Software Engineering FundamentalsLow-Level Design (OOP)Math & Number Theory
4
0
57 people solved
Aug 1, 2026
Mistral AI logo
Mistral AI
Medium
Software Engineer Locked

Explain the Forward and Reverse Processes of Diffusion Models

Explain Gaussian diffusion corruption, timestep-conditioned denoising, noise-prediction training, iterative reverse sampling, latent representations, ...

Machine LearningGenerative ModelsNeural Networks & Training
4
0
72 people solved
Sep 1, 2026
Apple logo
Apple
Medium
Machine Learning EngineerSenior+ Locked

Forecast Storage Demand Across 100 Data Centers

Forecast daily storage demand for one data center, scale models to 100 sites, and handle new-site cold starts with shared information and uncertainty.

ML System DesignTime Series & ForecastingModel Evaluation
6
0
92 people solved
Aug 24, 2026
Glean logo
Glean
Medium
Data Scientist

Expectation and Variance of the Sum of Two Random Variables

Let X and Y be two random variables. How do you calculate $E[X + Y]$ and $\operatorname{Var}(X + Y)$? The report asks only for the two calculations. T...

Statistics & MathProbability
0
0
4 people solved
Oct 25, 2026
Wayfair logo
Wayfair
Medium
Applied Scientist Locked

Simulate and Compare Multi-Armed Bandit Strategies

Compare epsilon-greedy, UCB1, and Thompson sampling in a reproducible Bernoulli bandit simulation with reward, pseudo-regret, and repeated-run uncerta...

Machine LearningSequential & Adaptive TestingProbability
3
0
53 people solved
Sep 10, 2026
DRW logo
DRW
Hard
Quantitative ResearcherNew Grad Locked

Expected Rounds Until a Shopping-Cart Line Empties Under Random Transfers

Markov chain expectation question in which two lines start with 6 and 7 shopping carts and each round one cart moves from a uniformly chosen line to a...

Statistics & MathProbabilityPuzzles & Brainteasers
6
0
44 people solved
Sep 13, 2026
DRW logo
DRW
Hard
Quantitative ResearcherNew Grad Locked

Posterior Probability of a Two-Headed Coin After Three Heads

Bayesian probability question with three coins: a fair coin, a coin that lands heads with probability 0.8, and a two-headed coin. After a randomly sel...

Statistics & MathProbabilityBayesian Statistics
4
0
33 people solved
Sep 13, 2026
Headlands logo
Headlands
Medium
Data Scientist Locked

t-Stat With an Added Orthogonal Regressor, Live Sharpe Check, and Absolute-Loss Estimator

Three written quantitative questions: how an OLS t-statistic changes when an orthogonal regressor is added, how many flat live trading days should mak...

Statistics & MathHypothesis TestingRegression & Statistical Modeling
8
0
62 people solved
Aug 30, 2026
Capital One logo
Capital One
Medium
Data Scientist

Analyze Subscription, Insurance, App, and Card Cases

You are in a Data Scientist "power day" interview for a product analytics role. The interviewer gives you four independent business cases. For each on...

Analytics & ExperimentationBusiness Case Analysis
43
0
770 people solved
Apr 12, 2026
Zoox logo
Zoox
Easy
Data Scientist

Solve estimation and probability brainteasers

This is a set of independent estimation and probability brainteasers of the kind asked rapid-fire from a slide deck. Treat each one separately. For ev...

Statistics & MathPuzzles & Brainteasers
179
1
2368 people solved
Nov 13, 2025
DRW logo
DRW
Hard
Quantitative ResearcherNew Grad Locked

Expected Dart Score for a Bivariate Normal Throw with Ring Scoring

Expected-value question about a dart whose landing point has independent zero-mean normal coordinates, calibrated so it lands within 1 unit of the ori...

Statistics & MathProbability
4
0
35 people solved
Sep 13, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer Locked

Transform Biased and Uniform Random Bits Exactly

Construct uniform values from biased bits and a chosen bias from fair bits, with probability proofs, exact sampling, and explicit source assumptions.

Statistics & MathProbabilityMath & Number Theory
8
0
59 people solved
Sep 9, 2026
Imc logo
Imc
Hard
Quantitative TraderNew Grad

Compute the Probability for Two Uniform Variables

Let \(X\) and \(Y\) be independent random variables, each uniformly distributed on \([0,1]\). Define: - \(L = \max(X,Y)\) - \(S = \min(X,Y)\) What is ...

Software Engineering FundamentalsProbabilityPuzzles & Brainteasers
19
0
196 people solved
Mar 5, 2026
Apple logo
Apple
Medium
Software Engineer

Distinguish Endpoint and Survival Probabilities in a 3D Diagonal Walk

A walk starts at an integer position (x,y,z) in an8x8x8 grid, with0<=x,y,z<8. On each step it independently chooses one of the eight vectors (±1,±1,±1...

Statistics & MathProbabilityDynamic Programming
0
0
11 people solved
Aug 26, 2026
Google logo
Google
Easy
Data Scientist

Build a Next-Word Predictor

Implement a simple next-word model over tokenized training sentences. You need to write two functions: 1. train(sentences): receives a list of tokeniz...

Coding & AlgorithmsML CodingNatural Language Processing
46
1
400 people solved
Feb 8, 2026
Deshaw logo
Deshaw
Easy
Data Scientist

Variance of an Equal-Weight Portfolio with Uncorrelated and Equicorrelated Assets

A portfolio holds n assets. The return of every asset has variance 1, and the portfolio is equally weighted, with weight 1/n on each asset. Find the v...

Statistics & MathPortfolio Construction & Alpha ResearchProbability
2
0
33 people solved
Aug 6, 2026
Mercor logo
Mercor
Medium
Machine Learning Engineer Locked

Implement a Referral Network

This question evaluates skills in modeling and manipulating directed acyclic graphs, implementing graph-based ranking metrics (reachability and flow c...

Coding & AlgorithmsGraphsData Structure Design
27
0
291 people solved
May 2, 2026
Meta logo
Meta
Hard
Software Engineer Locked

Design and Evaluate a Solver for a 36-Card Sum-Fifteen Game

Clarify a 36-card triple-sum game, compare legal search and heuristic strategies, and evaluate reproducible win rates and runtime across many games.

Software Engineering FundamentalsBacktracking & RecursionSimulation & State Machines
4
0
38 people solved
Sep 4, 2026
Mercor logo
Mercor
Hard
Software Engineer Locked

Find the Probability That One Shop Supplies the Top Two Coffees

Compute the probability that two coffees from one shop outrank both from another under an explicit exchangeable no-ties model.

Statistics & MathProbabilityPuzzles & Brainteasers
7
0
82 people solved
Sep 3, 2026
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