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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
Runway logo
Runway
Hard
Machine Learning Engineer

Implement n-gram model and select n

Implement n-gram model and select n Task: Implement an n-gram Language Model with Training, Sampling, and Model Selection Guidance Objective Implement...

Machine LearningNatural Language ProcessingML Coding
37
0
473 people solved
Aug 8, 2025
Apple logo
Apple
Medium
Software Engineer

Design a deck of cards with shuffle/draw

Object-Oriented Design + Randomness: A Deck of Cards Design an in-memory model of a standard 52-card playing deck. Your design will be exercised by cl...

Software Engineering FundamentalsLow-Level Design (OOP)Probability
59
0
438 people solved
Mar 1, 2026
Citadel logo
Citadel
Medium
Data Scientist

Derive Coefficient and Covariance in Regression Analysis

Derive Coefficient and Covariance in Regression Analysis This statistics prompt tests correlation constraints, regression slope relationships, covaria...

Statistics & MathProbabilityRegression & Statistical Modeling
101
0
296 people solved
Jul 12, 2025
LinkedIn logo
LinkedIn
Medium
Data Scientist

Implement fast sampling for weighted k-sided die

You must sample from a categorical distribution over k outcomes with probabilities p1..pk (sum to 1) without using built-in categorical samplers. You ...

Coding & AlgorithmsProbabilityMath & Number Theory
6
0
127 people solved
Oct 13, 2025
Upstart logo
Upstart
Medium
Data Scientist

Analyze HT vs HH stopping-time probabilities

Coin-Flip Stopping Game: HT vs HH You repeatedly flip a coin until either the pattern HT appears (Player A wins) or the pattern HH appears (Player B w...

Statistics & MathProbabilitySimulation & State Machines
10
0
188 people solved
Oct 13, 2025
Citadel logo
Citadel
Hard
Data Scientist Locked

Solve probability and stopping questions

This set of problems evaluates probabilistic reasoning and mathematical statistics skills, covering convolution for sums of independent variables, exp...

Statistics & MathProbabilityPuzzles & Brainteasers
23
0
442 people solved
Mar 14, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer Locked

Sample index from probability distribution

This question evaluates proficiency in randomized algorithms and probability-based sampling, along with algorithmic preprocessing and data-structure d...

Coding & AlgorithmsMath & Number TheoryBinary Search
35
0
250 people solved
Feb 11, 2026
Morgan Stanley logo
Morgan Stanley
Medium
Data Scientist

Solve Market-Risk and Probability Questions

Question Answer the following quantitative interview questions for a market-risk / data-scientist screen at Morgan Stanley. 1. Stress testing WTI and ...

Statistics & MathProbabilityPuzzles & Brainteasers
16
0
121 people solved
Mar 1, 2026
Upstart logo
Upstart
Medium
Data Scientist

Solve drunk-passenger probability and simulate outcome

Lost Boarding Pass Puzzle: Last Passenger's Seat Context: Technical screen for a Data Scientist (Statistics & Math). Setup - There are n passengers la...

Statistics & MathPuzzles & BrainteasersProbability
22
0
225 people solved
Oct 13, 2025
Google logo
Google
Medium
Product Manager

Z-tests versus t-tests: how each works and when to use it in experiments

Explain what a z-test and a t-test are, and how you decide which one to use. `hint Compare what each test assumes Write the two test statistics side b...

Analytics & ExperimentationHypothesis Testing
0
0
8 people solved
Mar 9, 2026
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Data Scientist

Find probability of overlapping blooms

Overlap Probability of Two Random Bloom Periods Assumptions - Time is measured in days over a 30-day horizon. - Each flower begins blooming once, at a...

Statistics & MathProbability
53
0
363 people solved
Aug 11, 2025
Voleon logo
Voleon
Easy
Data Scientist

Solve Markov, OLS-rotation, and coin-toss probability

Answer the following three interview questions. 1) Basic properties of a Markov (transition) matrix Let \(P\) be a transition matrix of a (time-homoge...

Statistics & MathProbabilityRegression & Statistical Modeling
79
0
712 people solved
Oct 6, 2025
LinkedIn logo
LinkedIn
Easy
Data Scientist Locked

Sketch distributions and compare mean/median/mode

This question evaluates understanding of distributional shape, central tendency (mean, median, mode), skewness, outliers, and the effects of combining...

Statistics & MathProbability
14
0
121 people solved
Feb 16, 2026
Optiver logo
Optiver
Hard
Software Engineer Locked

Calculate the Probability That Two Dice Sum to Seven

Roll two independent fair six-sided dice. Explain the assumptions and derivation clearly, check edge cases, and show how the result changes when those...

Statistics & MathProbability
12
0
136 people solved
May 24, 2026
Google logo
Google
Medium
Data Scientist

Compute p-values, probabilities, and regularization choices

Answer all parts. A) Hand‑compute a two‑sided p‑value comparing two means using Welch’s t‑test. Sample A: n1=20, mean1=5.2, sd1=1.1. Sample B: n2=24, ...

Statistics & MathHypothesis TestingProbability
18
0
223 people solved
Oct 13, 2025
Google logo
Google
Medium
Data Scientist

Understand Simpson's Paradox with Simple Examples

Understand Simpson's Paradox with Simple Examples Scenario You are a data scientist advising a product team on statistical analysis and experimental d...

Statistics & MathCausal InferenceRegression & Statistical Modeling
18
0
168 people solved
Aug 4, 2025
LinkedIn logo
LinkedIn
Easy
Data Scientist Locked

Choose single queue vs multiple queues

This question evaluates understanding of queueing theory, stochastic modeling of wait times, variability analysis, and the ability to state modeling a...

Analytics & ExperimentationProbabilityOperations & Capacity
9
0
86 people solved
Feb 16, 2026
Uber logo
Uber
Medium
Software Engineer

Implement uniform sampling in squares

Implement uniform sampling in squares Implement a class Square representing an axis-aligned square on the 2D plane that supports sampling a uniformly ...

Coding & AlgorithmsMath & Number TheoryProbability
9
0
107 people solved
Jul 15, 2025
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Sample uniformly from a circle’s area

How would you generate a point (x, y) uniformly at random from the area of a circle of radius R centered at the origin? - Explain why naive choices (e...

Coding & AlgorithmsMath & Number TheoryProbability
29
2
214 people solved
Feb 18, 2026
LinkedIn logo
LinkedIn
Medium
Data Scientist Locked

Explain variance reduction in random forests

This question evaluates understanding of variance reduction in ensemble methods, the impact of inter-tree correlation on averaged predictors, and the ...

Machine LearningML FundamentalsSupervised Learning
15
0
102 people solved
Feb 19, 2026
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