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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
11.9k
Companies
569
Updated
10.02.2026
11.9k Questions 569 Companies10.02.2026
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
Meta logo
Meta
Easy
Data ScientistSenior+

Compute invalid event percentage by pixel

Context You work on an ads pixel instrumentation platform. Each pixel emits events throughout the day; some events are missing (not observed) and some...

Data Manipulation (SQL/Python)
1
1
24 people solved
Aug 1, 2025
Amazon logo
Amazon
Medium
Applied Scientist

Describe a high-stakes project you owned

Describe a high-stakes project you owned Behavioral: End-to-End Ownership Under Ambiguity You are interviewing for a Machine Learning Engineer role. U...

Behavioral & Leadership
7
0
80 people solved
Jul 17, 2025
Meta logo
Meta
Medium
Data Scientist

Evaluate Facebook's Restaurant Recommendations Feature Effectiveness

Experiment Design: Restaurant Recommendations in Facebook News Feed Facebook is considering restaurant recommendation units inside News Feed, such as ...

Analytics & Experimentation
13
0
44 people solved
Jul 12, 2025
Meta logo
Meta
Medium
Data Scientist

Analyze Comment Distribution Using Statistical Metrics and Tests

Analyze Comment Distribution Using Statistical Metrics and Tests Assessing Concentration of Comments Across Posts Scenario You are analyzing comments ...

Analytics & Experimentation
5
0
42 people solved
Aug 4, 2025
Meta logo
Meta
Medium
Data Scientist

Design A/B Test to Evaluate New Video-Feed Feature

Design A/B Test to Evaluate New Video-Feed Feature Scenario A consumer social-media app is launching a short‑video feed (TikTok-style). A newly added ...

Analytics & Experimentation
3
0
36 people solved
Aug 4, 2025
Meta logo
Meta
Medium
Data Scientist

Compute ad revenue metrics by geography in SQL

You work on a marketplace app that shows shop ads. You are given the following tables. Assumptions - All timestamps are stored in UTC. - “Revenue” is ...

Data Manipulation (SQL/Python)SQLMetrics & KPIs
9
0
93 people solved
Oct 14, 2025
Atlassian logo
Atlassian
Medium
Data Scientist

Demonstrate motivation, feedback, and prioritization

Behavioral & Leadership STAR Prompts (Data Scientist — Technical Screen) Context: You are preparing for a Data Scientist technical screen at Atlassian...

Behavioral & Leadership
8
0
80 people solved
Oct 13, 2025
Amazon logo
Amazon
Medium
Data Scientist

Implement Reservoir Sampling; Analyze Time and Space Complexity

Scenario Process an unbounded stream of user IDs and maintain a uniform random sample of k users in memory. Question Implement reservoir sampling for ...

Coding & Algorithms
25
0
78 people solved
Aug 4, 2025
Capital One logo
Capital One
Easy
Data Scientist

Find minimal a for PSD of 3x3 matrix

PSD threshold for a 3×3 matrix with constant off-diagonal entries You are given the symmetric matrix with ones on the diagonal and a constant real val...

Statistics & Math
3
0
54 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Data Scientist

Define metrics and design experiments for notifications

Analytics/Experimentation Case: "Your friend is attending a local event—join them?" You are evaluating a proposed notification: "Your friend is attend...

Analytics & Experimentation
5
0
34 people solved
Oct 13, 2025
Uber logo
Uber
Hard
Data Scientist

Analyze results and large p-values correctly

Experiment Analysis Plan: User-Level ITT with Robust Inference, Variance Reduction, Ratios, Skew, Non-Compliance, and Decision Framework Context You r...

Statistics & MathExperiment Analysis & ReadoutHypothesis Testing
9
0
87 people solved
Oct 13, 2025
Meta logo
Meta
Easy
Data Scientist

How would you define and use retention metrics?

Scenario You are a Data Scientist supporting a consumer product (app or website). A PM asks you to “dive deep” on user retention and recommends tracki...

Analytics & ExperimentationSegmentation & Cohort AnalysisMetrics & KPIs
14
0
186 people solved
Feb 18, 2026
Pinterest logo
Pinterest
Medium
Data Scientist

Interpret A/B results for video-pin increase

A/B Test: Increasing Video Pins for New Users Context Pinterest ran an online controlled experiment on new users to increase the share of video pins i...

Analytics & ExperimentationExperiment Analysis & ReadoutHypothesis Testing
20
0
138 people solved
Oct 13, 2025
Meta logo
Meta
Medium
Data Scientist

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
6
0
86 people solved
Oct 13, 2025
C3 AI logo
C3 AI
Hard
Data Scientist

Find longest substring with at least k repeats

Find longest substring with at least k repeats Longest substring where each character appears at least k times You are given: - a string s consisting ...

Coding & Algorithms
6
0
49 people solved
Aug 9, 2025
NVIDIA logo
NVIDIA
Hard
Data Scientist

Demonstrate cultural fit and sales-oriented leadership

Context You are interviewing for a technical, customer-facing Data Scientist role at NVIDIA (HR screen). Provide concise, business-outcome-oriented re...

Behavioral & Leadership
6
0
72 people solved
Oct 13, 2025
Thumbtack logo
Thumbtack
Medium
Data Scientist

Explain a project and justify choices

Walk me through your most impactful project end-to-end: what problem and success metric did you define, what alternatives did you evaluate and reject,...

Behavioral & Leadership
3
0
48 people solved
Oct 13, 2025
Kneron logo
Kneron
Medium
Software Engineer

Optimize machines for distributed merging cost

Optimize machines for distributed merging cost Optimize k to Minimize Distributed Runtime Context You are splitting a dataset of size n across k ident...

System Design
2
0
32 people solved
Jul 26, 2025
Capital One logo
Capital One
Easy
Data Scientist

Calculate first-year profit margin

Profit Margin Calculation (Year 1) Context: A single product is sold in Year 1. m denotes million. Given: - Fixed costs: $375m - Units sold (Regular):...

Statistics & Math
5
0
47 people solved
Oct 13, 2025
Amazon logo
Amazon
Medium
Data Scientist

Explain P-value, Confidence Interval, and Multiple Testing Adjustments

Explain P-Value, Confidence Interval, and Multiple Testing Adjustments You are running online A/B experiments to evaluate a new product launch. Assume...

Statistics & Math
47
0
164 people solved
Jul 12, 2025
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