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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
Google logo
Google
Medium
Data Scientist

Simulate Coin Flips to Determine Fairness via Empirical Distribution

Scenario You must test whether a coin is fair by simulation. Question Write code that repeatedly simulates n coin flips, records the number of heads, ...

Coding & AlgorithmsHypothesis TestingProbability
14
0
135 people solved
Aug 4, 2025
SIG (Susquehanna) logo
SIG (Susquehanna)
Medium
Data Scientist

Compute ruin probability with bold betting

Probability of Reaching 5 Tokens Before Ruin Setup - You start with 3 tokens, target is 5 tokens, and ruin is 0. - On each turn, you bet as many token...

Statistics & MathProbabilityPuzzles & Brainteasers
18
0
201 people solved
Aug 11, 2025
Twilio logo
Twilio
Medium
Product Manager

Construct a hash from scratch and adapt it for tables, sharding and security

In a technical product manager interview, you are asked to design a hash function. Explain what a good hash function has to achieve, propose one concr...

Software Engineering FundamentalsTechnical Tradeoffs for PMsPartitioning & Consistent Hashing
1
0
12 people solved
Mar 19, 2026
Apple logo
Apple
Medium
Data Scientist

Compare Normal vs Poisson; test dispersion and approximate tails

You collect n=200 independent minute-level event counts with sample mean x̄=14.5 and sample variance s²=16.2. 1) Under a Poisson(λ) model, derive the ...

Statistics & MathHypothesis TestingSampling & Estimation
10
0
115 people solved
Oct 13, 2025
Optiver logo
Optiver
Medium
Software Engineer

Solve quick probability questions

Rapid-Fire Probability Questions You are in a timed quantitative screen. Answer each of the following independent probability questions, ideally in we...

Statistics & MathProbability
33
0
601 people solved
Aug 13, 2025
Optiver logo
Optiver
Medium
Software Engineer

Plan for timed probability assessment

Timed Probability/Statistics Assessment Strategy Company: Optiver · Role: Software Engineer You are taking a timed online assessment of 30 probability...

Statistics & MathProbability
121
0
961 people solved
Sep 6, 2025
Optiver logo
Optiver
Hard
Quantitative Trader

Optimize interval-scoring strategy

Optimize interval-scoring strategy Five-Round Interval-Estimation Game: Optimal Intervals and Risk Allocation You play five independent rounds. In rou...

Statistics & MathProbabilityDynamic Programming
27
0
254 people solved
Aug 7, 2025
OpenAI logo
OpenAI
Medium
Machine Learning Engineer

Maintain Entropy for a Streaming Distribution

A stream emits categorical observations one at a time. After each observation, report the empirical Shannon entropy of all observations seen so far: H...

Statistics & MathProbability
24
0
190 people solved
Aug 23, 2025
Zoox logo
Zoox
Medium
Data Scientist

Compute posterior for biased coin after 3H1T

You are given a coin known to be biased: one face lands with probability 2/3 and the other with probability 1/3, but you do not know whether Heads is ...

Statistics & MathBayesian Statistics
22
0
421 people solved
Oct 13, 2025
LinkedIn logo
LinkedIn
Medium
Data Scientist Locked

Derive mean and variance of x̄

This question evaluates understanding of expectation, variance, covariance structure, and how dependence between observations affects the precision of...

Statistics & MathSampling & EstimationProbability
7
0
112 people solved
Feb 19, 2026
Pinterest logo
Pinterest
Hard
Data Scientist

Analyze survey with gender imbalance

Analyze survey with gender imbalance Scenario You ran a user survey to measure satisfaction with a new product feature. Each respondent reports: - gen...

Statistics & MathSampling & EstimationProbability
22
0
176 people solved
Aug 2, 2025
Upstart logo
Upstart
Medium
Data Scientist

Estimate and Derive Regression Coefficient for X on y

Estimate and Derive Regression Coefficient for X on y Statistics & Probability Onsite — Two-Part Question Context - You have a simple linear data-gene...

Statistics & MathRegression & Statistical ModelingSampling & Estimation
97
0
391 people solved
Aug 4, 2025
Apple logo
Apple
Medium
Machine Learning EngineerSenior+ Locked

Choose File Storage Tiers Using Access Predictions

Choose file storage tiers using calibrated access probabilities, retrieval requirements, expected costs, leakage-free evaluation, and movement-aware p...

ML System DesignModel EvaluationSupervised Learning
6
0
54 people solved
Aug 24, 2026
LinkedIn logo
LinkedIn
Medium
Machine Learning Engineer

Sample index from weighted probability distribution

Given an array weights[0..M-1] representing a discrete distribution over M outcomes, implement a function sampleIndex(weights) that returns an index i...

Coding & AlgorithmsProbability
11
2
210 people solved
Feb 18, 2026
Upstart logo
Upstart
Easy
Data ScientistSenior+

Estimate impact without experiments and pick variant

Part A — Measuring impact when you cannot run an experiment You are a Staff Data Scientist working on a product change (feature/policy/model update). ...

Analytics & ExperimentationCausal InferenceExperiment Analysis & Readout
22
0
209 people solved
Feb 19, 2026
DRW logo
DRW
Easy
Quantitative Trader

Compute expected arc length on a circle

On the unit circle (radius \(1\), centered at the origin), pick three points independently and uniformly at random on the circumference. These three p...

Statistics & MathProbability
9
0
135 people solved
Nov 22, 2025
Microsoft logo
Microsoft
Hard
Software Engineer

Shard an LM Head and Combine Distributed Logits

An LM head maps a hidden state through a weight matrix [H,V] to vocabulary logits. Compare sharding the weight by vocabulary and by hidden dimension. ...

ML System DesignLLM Inference & ServingPartitioning & Consistent Hashing
2
0
28 people solved
Jan 19, 2026
Optiver logo
Optiver
Medium
Quantitative Researcher

Design dice betting strategy under time limit

Repeated Dice Betting with Time and Risk Constraints You have T = 10 minutes and an initial bankroll B = $1,000 to play a repeated betting game with a...

Statistics & MathProbabilityHypothesis Testing
9
0
161 people solved
Aug 12, 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
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
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