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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
Capital One logo
Capital One
Medium
Data Scientist

Compute optimal stopping in a die-rolling game

Optimal stopping with a fair die (3-roll horizon) You observe outcomes of fair six-sided die rolls (faces 1–6) and may stop after any roll to take the...

Statistics & MathPuzzles & BrainteasersProbability
11
0
204 people solved
Oct 13, 2025
Bank of America logo
Bank of America
Medium
Data Scientist

Explain core probability and ML statistics concepts

Answer the following short theory questions (you may use equations and brief examples): Probability 1. You roll two fair six-sided dice. - What is ...

Machine LearningProbabilityRegression & Statistical Modeling
24
0
189 people solved
Feb 11, 2026
Google logo
Google
Medium
Software Engineer Locked

Choose optimal guesses for green-only Wordle

This question evaluates probabilistic reasoning, expected-value optimization, information partitioning, and algorithmic efficiency in selecting guesse...

Coding & AlgorithmsMath & Number TheoryProbability
15
1
179 people solved
Oct 14, 2025
Optiver logo
Optiver
Hard
Quantitative Trader

Spot the Profitable Dice and Card Bets in a Market-Making Game

In a one-hour online round run as a market-making game, the interviewer presents a series of short games built on dice and playing cards. Each comes w...

Statistics & MathPuzzles & BrainteasersProbability
0
0
7 people solved
Nov 13, 2025
Google logo
Google
Easy
Data Scientist Locked

Implement sampling, subarray scan, and percentile estimate

This multi-part problem evaluates skills in random sampling and geometric probability for uniform 2D sampling, algorithmic array processing for findin...

Coding & AlgorithmsProbabilitySampling & Estimation
13
1
137 people solved
Feb 1, 2026
Upstart logo
Upstart
Medium
Data Scientist

Solve core probability/statistics mini-problems

Answer the following probability/statistics interview questions. Assume all randomness is independent unless stated otherwise. 1) Radioactive decay (h...

Statistics & MathProbabilityPuzzles & Brainteasers
20
0
140 people solved
Nov 29, 2025
Upstart logo
Upstart
Easy
Data ScientistSenior+

Combine noisy thermometers; compute random-walk correlations

Problem 1: Estimating a true temperature from noisy thermometers Assume the true (fixed) temperature is an unknown constant \(\theta\). 1a) One thermo...

Statistics & MathSampling & EstimationProbability
19
0
150 people solved
Oct 25, 2025
SIG (Susquehanna) logo
SIG (Susquehanna)
Easy
Data Scientist

Use Bayes for factory identification

Bayesian inference: Which factory given two black widgets? Setup - Two factories produce red and black widgets. - Factory A: 40% red, 60% black. -...

Statistics & MathBayesian Statistics
13
0
123 people solved
Aug 11, 2025
Citadel logo
Citadel
Hard
Data Scientist Locked

Solve Classic Probability Questions

This set evaluates probabilistic reasoning and expectation computation across topics such as sequential conditional survival, convolution of continuou...

Statistics & MathProbabilityPuzzles & Brainteasers
30
0
228 people solved
Feb 21, 2026
Pinterest logo
Pinterest
Medium
Data Scientist Locked

Implement weighted random choice

This question evaluates understanding of weighted random sampling, probability distributions, input validation, and algorithmic time and space complex...

Coding & AlgorithmsProbabilityArrays & Strings
21
0
143 people solved
Mar 10, 2026
Upstart logo
Upstart
Medium
Data Scientist

Simulate Radioactive Decay to Validate Analytical Solution

Scenario Same radioactive-decay problem, but now validate the analytical answer via simulation during the interview. Question Share screen and write r...

Coding & AlgorithmsProbabilitySampling & Estimation
14
0
139 people solved
Aug 4, 2025
Upstart logo
Upstart
Easy
Data Scientist

Calculate Expected Streaks in Coin Toss Sequence

Calculate Expected Streaks in Coin Toss Sequence Expected Number of Streaks in Coin Tosses Scenario You toss a coin repeatedly. A "streak" (a run) beg...

Statistics & MathProbability
32
0
184 people solved
Aug 4, 2025
Optiver logo
Optiver
Medium
Software Engineer

Estimate expected comparisons in a BST

Estimate expected comparisons in a BST In a particular binary search tree, finding node A takes 1 comparison and finding node D takes 3 comparisons. W...

Coding & AlgorithmsTreesProbability
21
0
178 people solved
Jul 17, 2025
Agoda logo
Agoda
Medium
Software Engineer

Compute probability two arrivals meet within 15 minutes

Probability puzzle Two people plan to meet, but they arrive independently at a random time within the next 1 hour. - Person A’s arrival time is unifor...

Software Engineering FundamentalsProbabilityPuzzles & Brainteasers
13
0
149 people solved
Dec 14, 2025
Capital One logo
Capital One
Medium
Data Scientist Locked

How should you renew or replace a show?

This question evaluates financial modeling, causal attribution, probabilistic decision-making, and strategic portfolio analysis skills for a Data Scie...

Analytics & ExperimentationBusiness Case AnalysisMetrics & KPIs
16
0
116 people solved
Feb 22, 2026
Lyft logo
Lyft
Easy
Data Scientist

Determine Probability of Single Ride on Following Day

Determine Probability of a Single Ride on the Following Day A pricing experiment gives each new rider two ride opportunities on day 1. For each offere...

Statistics & MathProbability
44
0
182 people solved
Jul 12, 2025
Apple logo
Apple
Medium
Software Engineer

Design card deck with shuffle and order

Design a playing-card deck library with two methods: shuffle() to return a uniformly random permutation of a standard 52-card deck, and order() to ret...

Coding & AlgorithmsData Structure DesignSorting
6
0
126 people solved
Sep 6, 2025
Medium
Quantitative Researcher

Choose a Numbered Deck Against an Optimal Repeated Guesser

Build a deck using any number of copies of cards labeled 1 through 5. An opponent knows its composition. Each round, the opponent names a number i and...

Statistics & MathPuzzles & BrainteasersProbability
1
0
16 people solved
Jun 2, 2026
LinkedIn logo
LinkedIn
Easy
Data Scientist Locked

How do you sample uniformly from an infinite stream?

This question evaluates understanding of streaming algorithms, randomized sampling and probability, and algorithmic space–time trade-offs involved in ...

Coding & AlgorithmsProbabilityMath & Number Theory
15
0
158 people solved
Feb 1, 2026
Lyft logo
Lyft
Medium
Data Scientist

Analyze Rider Behavior in Dynamic-Pricing Trial

Analyze Rider Behavior in Dynamic-Pricing Trial Dynamic-pricing trial: rider behavior Context (assumptions made explicit) - Each day the rider has two...

Statistics & MathProbability
25
1
170 people solved
Aug 4, 2025
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