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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
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
C3 AI logo
C3 AI
Medium
Data ScientistIntern

Find the Most Likely Stopping Sum When Rolling a Die

Find the Most Likely Stopping Sum When Rolling a Die Roll a fair six-sided die repeatedly and add the outcomes. Stop as soon as the running sum is at ...

Statistics & MathProbabilityPuzzles & Brainteasers
1
0
23 people solved
Sep 15, 2026
Capital One logo
Capital One
Medium
Data Scientist

Choose Evaluation Metrics and a Decision Threshold for a Binary Classifier

During a resume deep dive on a project in which you trained a binary classifier, the interviewer asks how you evaluated the model and, because the app...

Machine LearningModel Evaluation
0
0
3 people solved
Oct 23, 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
EliseAI logo
EliseAI
Easy
Software Engineer

Read and Critique a Short Python Function That Randomly Swaps List Elements

At the end of a 30-minute software engineer phone screen, the interviewer shares a short snippet and asks what you think of it. It is reproduced here ...

Software Engineering FundamentalsMath & Number TheoryCode Quality & Maintainability
4
0
33 people solved
Jul 5, 2026
Snapchat logo
Snapchat
Medium
Software Engineer Locked

Design a Metrics System

Design a metrics system with clear measurement semantics, scalable ingestion and queries, controlled label cardinality, retention, and visible failure...

System DesignObservabilityData Ingestion & CDC
3
0
65 people solved
Aug 22, 2026
Google logo
Google
Medium
Product Manager

Average or Median? Choosing the Summary Statistic for Google Search Metrics

You are interviewing for a product manager role on Google Search. The interviewer asks: when you summarize the metrics you care about, should you focu...

Analytics & ExperimentationMetrics & KPIsExperiment Analysis & Readout
0
0
11 people solved
Sep 1, 2026
Two Sigma logo
Two Sigma
Easy
Data Scientist

Answer four core statistics questions

Problem set (timed) Answer the following four questions. 1) Covariance of order statistics Let \(X\) and \(Y\) be independent \(\mathrm{Unif}(0,1)\). ...

Statistics & MathProbabilitySampling & Estimation
57
1
397 people solved
Dec 15, 2025
Jain Global logo
Jain Global
Easy
Data Scientist Locked

Define the p-Value, Then Explain How to Test Two Price Series for Cointegration

Two statistics questions from a systematic trading screen: give a precise definition of the p-value and its common misreadings, then explain what coin...

Statistics & MathHypothesis TestingTime Series & Forecasting
1
0
21 people solved
Sep 4, 2026
Optiver logo
Optiver
Medium
Software Engineer

Optiver Beat The Odds: Five Rapid-Fire Probability Brainteasers (Dice, Cards, Coins, Pigeonhole)

You are taking a timed online quantitative assessment (in the style of Optiver's "Beat The Odds" test). It consists of rapid-fire probability question...

Software Engineering FundamentalsProbabilityPuzzles & Brainteasers
43
0
586 people solved
Dec 18, 2025
Jane Street logo
Jane Street
Hard
Quantitative TraderIntern

Alternating Die-Roll Game: Optimal Accept/Reject Strategy

Two players, A and B, play the following game with a fair 21-sided die whose faces are labeled with the integers $-10, -9, \ldots, 9, 10$ (one integer...

Software Engineering FundamentalsPuzzles & BrainteasersProbability
62
1
450 people solved
Nov 20, 2025
Mercor logo
Mercor
Easy
Software Engineer

Design a Deliberately Inefficient Sorting Algorithm and Analyze Its Complexity

Design a sorting algorithm that is as inefficient as you can make it while still being correct: given a list of n elements, it must return them in sor...

Software Engineering FundamentalsSorting
2
0
21 people solved
Aug 8, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Generate uniform 0–6 from biased coin

You are given a function: - int getRandom01Biased() returns 0 with probability p and 1 with probability 1-p, where p is unknown and may be any value i...

Coding & AlgorithmsMath & Number TheoryProbability
31
0
254 people solved
Feb 18, 2026
Maven Securities logo
Maven Securities
Hard
Quantitative TraderNew Grad

Solve Graduate Trader Probability Questions

A graduate trader online assessment reportedly included the following quantitative reasoning, probability, and logic questions. Solve each problem. 1....

Software Engineering FundamentalsProbabilityPuzzles & Brainteasers
14
0
271 people solved
Jan 22, 2026
OpenAI logo
OpenAI
Hard
Software Engineer

Model particle hits on a screen

A point source at (0, 0) emits particles toward an infinite vertical screen located at x = 1. For each particle, sample an angle theta uniformly from ...

Software Engineering FundamentalsProbability
57
0
510 people solved
Feb 22, 2026
Mistral AI logo
Mistral AI
Medium
Software Engineer Locked

Solve Probability and Logic Puzzles Under Interview Pressure

This Mistral AI statistics and math question prepares candidates for probability and logic puzzles under time pressure. It evaluates structured reason...

Statistics & MathPuzzles & BrainteasersProbability
24
0
233 people solved
Jul 2, 2026
Hudson River Trading logo
Hudson River Trading
Medium
Software Engineer Locked

Choose Mean or Median for Trading Profit Metrics

This Hudson River Trading statistics question asks candidates to choose between mean and median for trading profit metrics. It is useful for practicin...

Statistics & MathSampling & Estimation
21
1
245 people solved
Jul 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
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
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
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