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

"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_

"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"

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

"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."

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

"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."

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

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."

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

"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."

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

"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."

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

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

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

_The_TaNk_

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

"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."

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

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

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."

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

"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."

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

"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."

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

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

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

DRW

Medium

Data Scientist

Compute Markov steady state and expectations

Compute Markov steady state and expectations Probability and Game Theory: Three Sub-questions Context: The exact transition matrix P (for Q1) and the ...

Statistics & MathProbabilityPuzzles & Brainteasers

Identify country with highest sunny-day probability

Write SQL to find the country with the highest probability that a day is sunny. Use the schema and sample data below. Rules: consider a day sunny for ...

Data Manipulation (SQL/Python)SQLProbability

Find minimum of unknown convex function

You are given access to an unknown univariate convex function $f(x)$ defined on a closed interval $[L, R]$ on the real line. - You cannot see the ...

Machine LearningBinary Search

Generate Weighted Random NFTs with Updates

You manage k NFT types, each with a positive integer rarity weight w[i]. Implement a minter: constructor(w) builds any needed structures in O(k); mint...

Coding & AlgorithmsMath & Number TheoryTrees

Letter-Guessing Strategy for a Program That Plays Hangman

You are interviewing for a product manager role at Google, and the interviewer asks a technical question: if you had to write a program that plays Han...

Software Engineering FundamentalsProbabilitySimulation & State Machines

Compute odds under time pressure

Timed Probability: At Least Two Reds in Three Draws You have an urn with r red, b blue, and g green balls. Let N = r + b + g with r, b, g ≥ 0 and N ≥ ...

Statistics & MathProbabilityPuzzles & Brainteasers

Compute expectations and test fairness for coin flips

You are analyzing repeated flips of a (possibly unfair) coin. Setup Let the probability of Heads be $p$ (unknown in general). Assume flips are indep...

Statistics & MathProbabilityHypothesis Testing

Compare queueing systems and common distributions

LinkedIn Data Scientist Statistics Fundamentals You are asked a series of statistics fundamentals questions in a data science technical screen. Constr...

Statistics & MathProbabilityRegression & Statistical Modeling

Compute an A/B test p-value by hand

In an A/B test on a game feature, you measure conversion rate (binary outcome). - Control: n₁ = 1000 users, x₁ = 120 conversions - Treatment: n₂ = 980...

Statistics & MathHypothesis TestingExperiment Design (A/B Testing)

Estimate Population Mean and Conversion Rate Accurately

Estimate Population Mean and Conversion Rate Accurately You are asked a series of statistical inference questions covering hypothesis testing, confide...

Statistics & MathHypothesis TestingSampling & Estimation

Assess Probability of Heads in Coin Tosses

Assess Probability of Heads in Coin Tosses Probability with Coin Tosses and the Normal Distribution Context Onsite data scientist screening question a...

Statistics & MathProbability

Data Scientist Locked

Stabilize LLM inference and estimate needed repeats

This question evaluates skills in designing reliable LLM inference pipelines and in statistical modeling of stochastic outputs, including reproducibil...

ML System DesignSampling & EstimationProbability

Data Scientist Locked

Implement sampling and subarray algorithms

Solve uniform 2D square sampling and longest increasing contiguous subarray. The solution maps Uniform(0,1) to Uniform(-1,1), proves uniformity by ind...

Coding & AlgorithmsProbabilityArrays & Strings

Compute Variance from a Python List

Given a Python list of numeric values, write a function to compute the variance without using external libraries such as NumPy or pandas. Clarify any ...

Coding & AlgorithmsProbability

Decide best email variant using stratified A/B analysis

Stratified A/B Test Across Two Strata (Week/Location) You ran an email A/B test across two strata defined by week/location. Each user receives at most...

Analytics & ExperimentationExperiment Analysis & ReadoutHypothesis Testing

103 people solved

Oct 13, 2025

Calculate Ad Insertion Statistics for Two Methods

Ad Insertion Statistics for Two Feed Strategies You are comparing two ways of inserting ads into a 100-post feed. - Option A: Each post independently ...

Statistics & MathProbability

Derive expectation for two consecutive heads

Waiting Time Until First HH (Two Consecutive Heads) Setup Let T be the number of coin flips required until the pattern HH (two consecutive heads) appe...

Statistics & MathProbability

Design a fraud mitigation strategy under constraints

You are given a one-page case during a hiring manager round for a Fraud Data Scientist role. Current state: - The existing fraud model is performing p...

Analytics & ExperimentationBusiness Case AnalysisModel Evaluation

Calculate CI and Test Correlation Under Normality

Inference on a Mean, Significance of a Correlation, and a Normal Quantile Assume standard parametric conditions (normality as stated). Show formulas, ...

Statistics & MathHypothesis TestingSampling & Estimation

Generate Samples from Truncated Normal Distribution

Sampling from a Truncated Normal Distribution You draw from a normal distribution but only keep observations that are at least 1. Assume the original ...

Statistics & MathProbabilitySampling & Estimation

122 people solved

Jul 12, 2025

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Tech Interview Questions

Compute Markov steady state and expectations

Identify country with highest sunny-day probability

Find minimum of unknown convex function

Generate Weighted Random NFTs with Updates

Letter-Guessing Strategy for a Program That Plays Hangman

Compute odds under time pressure

Compute expectations and test fairness for coin flips

Compare queueing systems and common distributions

Compute an A/B test p-value by hand

Estimate Population Mean and Conversion Rate Accurately

Assess Probability of Heads in Coin Tosses

Stabilize LLM inference and estimate needed repeats

Implement sampling and subarray algorithms

Compute Variance from a Python List

Decide best email variant using stratified A/B analysis

Calculate Ad Insertion Statistics for Two Methods

Derive expectation for two consecutive heads

Design a fraud mitigation strategy under constraints

Calculate CI and Test Correlation Under Normality

Generate Samples from Truncated Normal Distribution

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