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

Netflix

Easy

Data ScientistIntern Locked

Solve core probability and statistics questions

This question evaluates proficiency in core probability and statistical inference—covering Bayes' rule, causal controls in regression, the Central Lim...

Statistics & MathProbabilityHypothesis Testing

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

Determine Normality of Single Observation with Z-Test

Hypothesis Test for One Observation Against a Standard Normal You observe a single numeric value x and want to decide whether it could plausibly have ...

Statistics & MathHypothesis TestingProbability

Compute probabilities for chatbot response quality

Context A chatbot response is considered good if it is both: - Helpful, and - Honest. You are told: - $P(\text{Helpful}) = 0.8$ - \(P(\text{Honest})...

Statistics & MathProbability

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

Machine Learning Engineer

Explain and derive importance sampling estimators

Importance Sampling: Estimators, Properties, Optimal Proposals, and ESS Context You want to estimate an expectation under a target distribution p over...

Statistics & MathSampling & EstimationProbability

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

Model waiting-time abandonment via survival

Survival Modeling of Rider Abandonment During Pickup Waits Context You are modeling when a rider cancels (abandons) while waiting for pickup. Let time...

Statistics & MathRegression & Statistical Modeling

[Analytical Reasoning] Comparing Two Newsfeed Ad Insertion Methods

Compare two ad-insertion methods for a 100-post newsfeed. Both methods have the same average ad load. - Method A: each post is independently replaced ...

Analytics & ExperimentationProbabilityExperiment Design (A/B Testing)

108 people solved

Apr 7, 2025

Boston Consulting Group

Medium

Data Scientist

Compute averages and binomial/Poisson probabilities

Streaming Mean and Binomial vs Poisson Approximation Part A — Streaming Mean Update You have an existing dataset of N = 1,000 observations with mean 1...

Statistics & MathProbabilitySampling & Estimation

Explain median vs mean for L1/L2

Median vs. Mean Under L1 and L2 Loss, and the 2D Extension Explain, with intuition and a brief derivation, the relationship between the choice of loss...

Statistics & MathSampling & Estimation

Model comment count distribution and validate assumptions

You observe daily comment counts per post on a large social app are highly skewed with many zeros. a) Choose an appropriate discrete model among Poiss...

Statistics & MathProbabilitySampling & Estimation

Analyze Distribution of Daily Page Shares Per User

Engagement Distributions and Cohort Dynamics You are analyzing per-user, per-day engagement. Assume the panel includes all users, inactive days count ...

Statistics & MathProbabilitySegmentation & Cohort Analysis

Data Scientist Locked

Design navigation-safety simulation parameters and experiments

Design a simulation-based safety evaluation for a self-driving agent: choose which scene parameters to vary, how to sample them, and what to measure. ...

Machine LearningProbabilitySampling & Estimation

Price a coin-doubling game rationally

Coin-Doubling (St. Petersburg) Game: EV, Log-Utility Pricing, Kelly Staking, and House Cap Context and assumptions - Single play: You buy one ticket t...

Statistics & MathProbabilityPuzzles & Brainteasers

Implement robust one/two-sided p-value function

Implement p_value(stat, alternative, dist, df=None) Context: You're building a small, production-quality helper to compute p-values for common one- an...

Statistics & MathHypothesis TestingProbability

Data Scientist Locked

Explain Bootstrap and Prove Uniformity

This question evaluates mastery of statistical inference and probability theory, testing knowledge of resampling methods (bootstrap), interpretation o...

Statistics & MathProbabilityHypothesis Testing

Data Scientist Locked

Compute Bayes probability for fake accounts

This question evaluates Bayesian reasoning and probabilistic modeling skills, including conditional probability, base-rate effects, detector character...

Statistics & MathProbability

Calculate Expected Users Linking Coinbase Wallets

Expected Coinbase Wallet Linking When users sign up for Coinbase, each of the n users is independently prompted to link a crypto wallet. Each user lin...

Statistics & MathProbability

Compute Poisson supply–demand match probability

In a city-day of a two-sided marketplace, customer demand D ~ Poisson(8) and supplier capacity S ~ Poisson(6), assumed independent. (a) Compute P(S >=...

Statistics & MathProbability

169 people solved

Oct 13, 2025

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Tech Interview Questions

Solve core probability and statistics questions

Implement sampling and subarray algorithms

Determine Normality of Single Observation with Z-Test

Compute probabilities for chatbot response quality

Calculate Ad Insertion Statistics for Two Methods

Explain and derive importance sampling estimators

Derive expectation for two consecutive heads

Model waiting-time abandonment via survival

[Analytical Reasoning] Comparing Two Newsfeed Ad Insertion Methods

Compute averages and binomial/Poisson probabilities

Explain median vs mean for L1/L2

Model comment count distribution and validate assumptions

Analyze Distribution of Daily Page Shares Per User

Design navigation-safety simulation parameters and experiments

Price a coin-doubling game rationally

Implement robust one/two-sided p-value function

Explain Bootstrap and Prove Uniformity

Compute Bayes probability for fake accounts

Calculate Expected Users Linking Coinbase Wallets

Compute Poisson supply–demand match probability

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