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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
Tower logo
Tower
Medium
Quantitative ResearcherIntern

Can Pooled Correlation Exceed Every Group Correlation?

A dataset has 100,000 observations with variables x1 and x2. It is divided into three groups of approximately equal size. Within each group, the Pears...

Statistics & MathProbability
2
0
20 people solved
Oct 24, 2026
Pinterest logo
Pinterest
Medium
Machine Learning EngineerIntern

Ensemble Learning Trade-offs and Why Bagging Reduces Overfitting

Two multiple-choice questions in this assessment concerned ensemble methods: one on the advantages and disadvantages of ensemble learning (for example...

Machine LearningSupervised LearningML Fundamentals
1
0
31 people solved
Oct 14, 2026
Mercor logo
Mercor
Medium
Software Engineer

The Worst Possible Sorting Algorithm and How to Enumerate Every Permutation

This is a verbal question from a technical screen with no coding. The interviewer asks for the worst sorting algorithm you can think of and its runnin...

Software Engineering FundamentalsSortingBacktracking & Recursion
5
0
89 people solved
Oct 10, 2026
Waymo logo
Waymo
Medium
Data Scientist

Estimate Event Rates from Unequal-Probability Samples

Estimate Event Rates from Unequal-Probability Samples You have a population table of units and their known probabilities of being selected for inspect...

Statistics & MathSampling & Estimation
6
0
104 people solved
Sep 28, 2026
Mercor logo
Mercor
Hard
Software Engineer

Sort With a 90%-Accurate Paid Comparator: Algorithm, Accuracy and Cost

You are given a set of n objects that must be sorted by an underlying value you cannot read directly. The only way to learn anything about the values ...

Statistics & MathSortingProbability
22
0
201 people solved
Sep 12, 2026
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Quantitative Trader

Probability of Reaching a Chip Target Under Bold Betting

You start with $A$ chips and want to reach $B$ chips, where $A$ and $B$ are integers with $B > A > 0$. Each round you place an even-money bet that you...

Statistics & MathProbabilityPuzzles & Brainteasers
13
0
93 people solved
Sep 19, 2026
OpenAI logo
OpenAI
Hard
Software Engineer Locked

Find a Hidden Number When Each Comparison Answer Arrives One Call Late

Find a hidden integer from 1 to n using a comparison API whose answers arrive one call late: each call submits a new guess but returns the result for ...

Software Engineering FundamentalsBinary Search
49
0
362 people solved
Sep 20, 2026
Squarepoint logo
Squarepoint
Easy
Quantitative ResearcherNew Grad

Probability the Double-Headed Coin Was Drawn After Ten Heads From a Jar of 1,000 Coins

A jar holds 1,000 coins: 999 are fair and one has heads on both sides. Coins are drawn from the jar at random and tossed, and ten heads come up. What ...

Statistics & MathProbabilityPuzzles & Brainteasers
1
0
11 people solved
Nov 2, 2026
Jane Street logo
Jane Street
Hard
Software Engineer Locked

Optimal Stopping with Square-Number Ruin

You repeatedly roll a fair six-sided die and add each roll to a running total. Explain the assumptions and derivation clearly, check edge cases, and s...

Statistics & MathPuzzles & BrainteasersProbability
145
2
1327 people solved
Aug 3, 2026
Tower logo
Tower
Medium
Quantitative ResearcherIntern

Conditional Probability on a Six-Position Circular Arrangement

A circular device has six positions, exactly two marked and four unmarked. A starting position is chosen uniformly at random. You observe that the cur...

Statistics & MathProbabilityPuzzles & Brainteasers
1
0
15 people solved
Oct 24, 2026
Tower logo
Tower
Medium
Quantitative ResearcherIntern

Bound a Third Correlation from Two Known Correlations

Three random variables have finite, positive variances. Their Pearson correlations satisfy corr(X1,X2) = 0.5 and corr(X2,X3) = 0.5. Determine the full...

Statistics & MathProbability
2
0
15 people solved
Oct 24, 2026
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Quantitative Trader

Bayesian Posterior That k Red Parts Came From Factory A

Two factories make the same part in two colors. Factory A's output is $a\%$ red and $(100-a)\%$ black. Factory B's output is $b\%$ red and $(100-b)\%$...

Statistics & MathProbabilityBayesian Statistics
3
0
75 people solved
Sep 19, 2026
Capital One logo
Capital One
Medium
Data Analyst

Compare Two-Year Economics for Renewing or Replacing a Show

Compare Two-Year Economics for Renewing or Replacing a Show A streaming business is considering renewing an existing show, The Analyst, or producing a...

Analytics & ExperimentationBusiness Case AnalysisProbability
10
1
116 people solved
Sep 15, 2026
Cohere logo
Cohere
Medium
Machine Learning Engineer

Implement Greedy, Top-k and Top-p Decoding in NumPy for a Toy Language Model

You are given starter code with a toy language model class, RandomGPT. Its vocabulary has 10 tokens (IDs 0 to 9). Its forward method takes the tokens ...

Machine LearningML CodingLLM Inference & Serving
19
0
136 people solved
Sep 22, 2026
Jane Street logo
Jane Street
Easy
Quantitative TraderIntern

Solve probability and game-theory puzzles

You are interviewing for a quant trading internship. Work through the following probability and game-theory puzzles. There is no need to answer instan...

Statistics & MathPuzzles & BrainteasersProbability
546
0
3965 people solved
Dec 1, 2025
Mercor logo
Mercor
Medium
Software Engineer

Probability That One Customer's Two Coffees Beat Another's Two

A coffee shop's drinks vary in quality from cup to cup. Customer A and customer B each buy two cups. What is the probability that A's two cups taste b...

Statistics & MathProbabilityPuzzles & Brainteasers
7
0
51 people solved
Oct 4, 2026
Squarepoint logo
Squarepoint
Medium
Data Scientist Locked

Find the Probability That Two Uniform Variables Have Product Above One-Half

Compute the probability that two independent uniform variables have product above one-half by conditioning or integrating over the unit square.

Statistics & MathProbability
24
0
207 people solved
Sep 9, 2026
Netflix logo
Netflix
Easy
Machine Learning EngineerIntern Locked

ML Basics Check: Bayes' Rule, Forward-Pass Arithmetic, KNN and Transformer Concepts

A set of basic machine learning checks: a Bayes' rule posterior with a low base rate, forward-pass and parameter-count arithmetic for small neural net...

Machine LearningML FundamentalsNeural Networks & Training
13
2
202 people solved
Sep 11, 2026
Glean logo
Glean
Medium
Data Scientist

Expectation and Variance of a Sum of Two Random Variables, Including Covariance

In a hiring-manager interview for a data scientist role, the statistics question was: how do you compute the expectation and the variance of the sum o...

Statistics & MathProbability
6
0
85 people solved
Sep 30, 2026
Jane Street logo
Jane Street
Medium
Quantitative TraderIntern Locked

Estimate the Number of Florists in Sydney and Make a Market

Estimate Sydney florist businesses with a transparent Fermi model, cross-check the result independently, quote a defensible two-sided market, and upda...

Statistics & MathEstimation & Market SizingProbability
50
0
871 people solved
Aug 24, 2026
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