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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
Viridien logo
Viridien
Medium
Data Scientist

Count fillings of a 3x3 grid where every 2x2 block holds 1 to 4

Each cell of a 3×3 grid is filled with one of the numbers 1, 2, 3 and 4. The grid contains four 2×2 blocks of adjacent cells: top-left, top-right, bot...

Statistics & MathPuzzles & BrainteasersMath & Number Theory
0
0
1 people solved
Nov 1, 2026
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
20
0
174 people solved
Apr 2, 2026
Perplexity logo
Perplexity
Medium
Data Scientist Locked

Implement Stratified Sampling by Country

This question evaluates understanding of stratified sampling, proportional allocation across groups, reproducible random sampling, data grouping and e...

Coding & AlgorithmsSampling & Estimation
12
0
168 people solved
Apr 9, 2026
Microsoft logo
Microsoft
Medium
Software EngineerSenior+

Debug a Numerical Underflow in an A/B Testing Analytics Repo When the AI Agent Is Wrong

This round is an AI-assisted coding exercise. You are given a real, multi-file repository for an A/B testing analytics platform, a list of five report...

Software Engineering FundamentalsAI-Assisted DevelopmentDebugging
2
0
17 people solved
Jun 16, 2026
Squarepoint logo
Squarepoint
Hard
Data Scientist

How Does Removing Zeros Affect Sharpe?

Suppose a return series has 2n observations. Exactly n observations are 0, and the remaining n observations are non-zero returns x1, x2, ..., xn with ...

Statistics & MathProbability
19
0
147 people solved
Mar 27, 2026
Databricks logo
Databricks
Hard
Data Scientist

Explain ROC-AUC vs PR-AUC tradeoffs

Question You trained a binary classifier that outputs predicted probabilities. Compare ROC-AUC and PR-AUC (the latter usually reported as Average Prec...

Machine LearningModel Evaluation
14
0
196 people solved
Dec 12, 2025
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Data Scientist

Exploit a Rock-Paper-Scissors Opponent with a Forbidden Gesture

Two rational players play rock-paper-scissors. After observing the opponent's first gesture, you know the opponent cannot use that gesture on the next...

Statistics & MathPuzzles & BrainteasersProbability
0
0
6 people solved
Aug 28, 2026
OpenAI logo
OpenAI
Medium
Machine Learning Engineer

Derive MLE and Bayesian posterior for Bernoulli

Bernoulli/Binomial Inference Task You observe n independent Bernoulli trials with unknown success probability p, and you record k successes (so K ~ Bi...

Statistics & MathSampling & EstimationBayesian Statistics
87
0
763 people solved
Aug 11, 2025
Apple logo
AppleGoogleGoldman Sachs

Also asked at Goldman Sachs, Spinny, Citadel

Medium
Software Engineer

Compute Knight Survival Probability after K Random Moves

Problem A knight starts at (row,column) on an n-by-n board with zero-based coordinates. At each move it chooses uniformly among all eight knight offse...

Coding & AlgorithmsDynamic ProgrammingProbability
1
0
12 people solved
OpenAI logo
OpenAI
Medium
Software Engineer Locked

Design Restart Strategy for Oracle Solver

This question evaluates understanding of probabilistic runtime analysis and restart strategies for randomized (Las Vegas-style) solvers, including exp...

Machine LearningProbability
15
0
121 people solved
Jan 13, 2026
Uber logo
Uber
Medium
Data Scientist

Compare Two Coin Proportions

You are given results from two independent coin-toss experiments: - Coin A was tossed 100 times and landed heads 40 times. - Coin B was tossed 1,000 t...

Statistics & MathHypothesis TestingSampling & Estimation
19
0
170 people solved
Mar 28, 2026
Voleon logo
Voleon
Hard
Machine Learning EngineerNew Grad Locked

Explain ML and statistical modeling

This question evaluates mastery of machine learning and statistical modeling concepts including class-imbalance strategies, loss function behavior and...

Machine LearningML FundamentalsRegression & Statistical Modeling
21
1
279 people solved
Feb 15, 2026
Optiver logo
Optiver
Hard
Software Engineer Locked

Analyze an Unfair-Coin Bankroll Game

A player starts with a bankroll of 10. Explain the assumptions and derivation clearly, check edge cases, and show how the result changes when those as...

Statistics & MathProbabilityPuzzles & Brainteasers
28
0
221 people solved
May 24, 2026
Jane Street logo
Jane Street
Hard
Software Engineer

Design sequential reveal classification and policy

FashionMNIST: Row-wise Reveal Evaluation, Reward-Optimal Masking, Augmentation, and Early Exit Context You have a trained CNN classifier for FashionMN...

ML System DesignComputer VisionModel Evaluation
62
0
545 people solved
Sep 6, 2025
Waymo logo
Waymo
Easy
Data Scientist

Estimate total attendance from size-biased reservation sample

You run a restaurant with N = 10,000 reservations in a day. Each reservation j has: - Reserved party size: \(R_j\) (positive integer) - Actual number ...

Statistics & MathSampling & Estimation
46
0
326 people solved
Nov 11, 2025
Jane Street logo
Jane Street
Medium
Quantitative Trader

Sealed-Bid Auction for a Box of 200 Coin Flips (and an Informed Opponent)

You are one of two bidders in a sealed-bid auction for a box. The box's payout is determined by flipping 200 fair coins: it pays \$1 for every coin th...

Machine LearningProbabilityPuzzles & Brainteasers
29
0
278 people solved
Oct 10, 2025
Waymo logo
Waymo
Easy
Data Scientist

Compute probability match lasts 5 games

Two players play independent games of table tennis. - Player A wins each game with probability \(p\) (constant across games). - They play a best-of-5 ...

Statistics & MathProbabilityHypothesis Testing
29
0
338 people solved
Nov 11, 2025
Netflix logo
Netflix
Medium
Data ScientistIntern

Answer core probability and statistics questions

Answer the following interview-style probability/statistics questions. Provide formulas and short explanations. 1) Bayes’ rule: State Bayes’ rule. Giv...

Statistics & MathProbabilityHypothesis Testing
68
0
453 people solved
Mar 5, 2026
Google logo
GoogleUberLinkedIn

Also asked at LinkedIn, Meta, JPMorgan Chase, Amazon, Goldman Sachs

Medium
Software Engineer

Shuffle an Array and Restore Its Original Order

Shuffle an Array and Restore Its Original Order Implement a Solution object initialized with an integer array of distinct values: - Solution(nums): in...

Coding & AlgorithmsMath & Number TheoryArrays & Strings
0
0
10 people solved
Two Sigma logo
Two Sigma
Hard
Data Scientist

Predict Citi Bike Demand at a Specific NYC Station

Citi Bike is New York City's bike-share system: riders pick up a bike at one docked station and drop it off at another. Operations needs to know how m...

ML System DesignTime Series & ForecastingFeature Engineering
37
1
286 people solved
Nov 28, 2025
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