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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
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Quantitative Trader

Expected Spins of an Unequal Spinner to Land in K Distinct Regions

A spinner has $N$ regions. Each spin lands in region $i$ with probability $p_i$, independently of all other spins, where $p_1 + p_2 + \dots + p_N = 1$...

Statistics & MathProbabilityDynamic Programming
3
0
36 people solved
Sep 19, 2026
OpenAI logo
OpenAI
Medium
Machine Learning Engineer

Compute entropy and implement 1-NN

You are given two short ML coding problems from a machine-learning engineer screen. Both are implementation-focused but probe whether you understand t...

Machine LearningML Coding
190
4
1802 people solved
Apr 24, 2026
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Quantitative Trader

Expected Number of Same-Rank Pairs in a Hand Dealt Without Replacement

A deck contains $M$ ranks with $N$ cards of each rank, so it holds $MN$ cards in total. You are dealt $K$ cards from the shuffled deck, without replac...

Statistics & MathProbabilityPuzzles & Brainteasers
1
0
27 people solved
Sep 19, 2026
Akuna Capital logo
Akuna Capital
Medium
Quantitative ResearcherIntern

Compute an Exact Head Count Probability with Dynamic Programming

A biased coin has probability 0.7 of heads and 0.3 of tails on each independent toss. Compute the probability of exactly five heads in ten tosses, the...

Coding & AlgorithmsProbabilityDynamic Programming
1
0
23 people solved
Aug 30, 2026
Hudson River Trading logo
Hudson River Trading
Medium
Data Scientist Locked

Compare Mean and Median for a Distribution with a Point Mass

Compare mean and median estimation for a point-mass and normal mixture using MAE simulation, finite-sample formulas, and error probabilities at sample...

Statistics & MathSampling & EstimationProbability
13
0
165 people solved
Sep 9, 2026
xAI logo
xAI
Medium
Machine Learning EngineerNew Grad Locked

Find All Faulty GPU Nodes with Parallel Group Tests That Cannot Share Nodes

An algorithm design question about finding every faulty GPU node when the only tool is a group test that fails if any node in the set is bad. Tests ne...

Software Engineering FundamentalsMath & Number Theory
4
0
77 people solved
Sep 5, 2026
Goldman Sachs logo
Goldman Sachs
Medium
Quantitative Researcher

Estimate Pi with a Square Cardboard and a Fair Die to 5-6 Decimal Places

You are given a square piece of cardboard and a fair six-sided die whose faces 1 to 6 are equally likely. Design an experiment that estimates π empiri...

Statistics & MathSampling & EstimationProbability
1
0
26 people solved
Sep 25, 2026
DRW logo
DRW
Hard
Quantitative ResearcherNew Grad Locked

Probability the Two Strongest Teams Meet in a 16-Team Knockout Final

Probability puzzle about a 16-team single-elimination bracket with random slot assignment, in which the stronger team wins each game with probability ...

Statistics & MathProbabilityPuzzles & Brainteasers
5
1
49 people solved
Sep 13, 2026
DRW logo
DRW
Hard
Quantitative ResearcherNew Grad Locked

Expected Winnings in a Random-Walk Money Collection Game on 45 Stones

Random-walk puzzle in which a token moves one step either way around a circle of 45 stones holding 100 dollars each, while two players alternate coin-...

Statistics & MathPuzzles & BrainteasersProbability
12
0
142 people solved
Sep 13, 2026
Karat logo
Karat
Medium
Software Engineer

Implement obstacle-course run statistics

You are given a TypeScript codebase for tracking race results on an obstacle course. - A Course has a fixed number of obstacles. - A Run stores the ti...

Coding & AlgorithmsProbability
41
2
392 people solved
Apr 12, 2026
Squarepoint logo
Squarepoint
Medium
Data Scientist Locked

Find the Expected Distance of a Uniform Point from a Disk's Center

Derive the radial distribution and expected distance for a point sampled uniformly by area inside a unit disk.

Statistics & MathProbabilityPuzzles & Brainteasers
7
0
95 people solved
Sep 9, 2026
ByteDance logo
ByteDance
Medium
Applied ScientistNew Grad

Write the Cross-Entropy Loss and Compute Precision, Recall and F1

Two ML fundamentals questions about classification: the cross-entropy loss used to train a classifier, and the F1 score used to evaluate one. Clarifyi...

Machine LearningML FundamentalsModel Evaluation
2
0
24 people solved
Oct 8, 2026
Waymo logo
Waymo
Medium
Software Engineer Locked

Deduplicate a 256 GB File on a Machine With 128 MB of Memory

Remove duplicate records from a single 256 GB file on a machine with only 128 MB of memory. Tests external-memory techniques such as hash partitioning...

Software Engineering FundamentalsSorting
4
0
32 people solved
Sep 10, 2026
Headlands logo
Headlands
Medium
Data ScientistNew Grad Locked

Compare Candy-Color Guessing Experiments with Different Sample Sizes

Use one-sided binomial tests to compare 2 of 3 and 40 of 100 correct guesses among five colors, with explicit assumptions and careful interpretation.

Statistics & MathHypothesis TestingProbability
2
0
50 people solved
Aug 31, 2026
Reddit logo
Reddit
Hard
Machine Learning Engineer Locked

Explain and Reduce Position Bias in Ranking

Explain position bias in click-based ranking, distinguish examination from relevance, and assess propensity estimation, debiasing, and reliable evalua...

Machine LearningRanking ModelsModel Evaluation
11
0
75 people solved
Aug 23, 2026
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Quantitative Trader

Counting Rows Formed From Two Kinds of Identical Items

You have $A$ identical items of one kind and $B$ identical items of a second kind. You choose $C$ of these items and arrange them in a row. How many d...

Statistics & MathPuzzles & BrainteasersMath & Number Theory
2
0
44 people solved
Sep 19, 2026
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Quantitative Trader

Probability Two Randomly Started Flower Bloom Periods Overlap

Two kinds of flowers will each begin blooming on a random day within the next $D$ days, independently of each other. Once it starts, the first kind st...

Statistics & MathProbability
4
0
44 people solved
Sep 19, 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
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
StackAdapt logo
StackAdapt
Medium
Machine Learning Engineer Locked

Reservoir Sampling: Uniform k-of-n Sample From a Stream of Unknown Length

Design a one-pass algorithm that keeps a uniform random sample of k items from a stream whose length is unknown in advance, using memory proportional ...

Statistics & MathMath & Number TheoryProbability
5
0
59 people solved
Sep 9, 2026
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