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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
18.6k
Companies
980
Updated
11.12.2026
18.6k Questions 980 Companies11.12.2026
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
Hard
Data Scientist

Measure outage impact; choose fix vs build

End-to-End Analysis Plan: Investigating Frequent Google Meet Call Drops Context A major enterprise customer reports frequent Google Meet call drops. A...

Analytics & Experimentation
11
0
81 people solved
Oct 13, 2025
Medium
Data Scientist Locked

Design anomaly detection and handle imbalanced logistic regression

Design a fraud detection setup for 50M transactions at a 0.4% fraud rate: a supervised logistic regression model plus an unsupervised anomaly detector...

Machine Learning
3
0
36 people solved
Oct 13, 2025
Medium
Data Scientist

Explain motivations, customer ownership, mentoring, and culture fit

1) Why are you leaving your current company? Answer in <90 seconds, avoid negativity, and tie your reason to specific growth you seek (e.g., owning an...

Behavioral & Leadership
3
0
38 people solved
Oct 13, 2025
Medium
Data Scientist

Query conversion and retention with SQL windows

Schema and sample data (PostgreSQL): users(id, signup_date, country) 1 | 2025-08-20 | US 2 | 2025-08-25 | US 3 | 2025-08-27 | CA 4 | 2025-08-30 | US 5...

Data Manipulation (SQL/Python)
3
0
34 people solved
Oct 13, 2025
Medium
Data Scientist

Compute p-values and adjust multiplicity

You test if a coin is fair after 20 flips and observe 17 heads. (a) Compute the exact two-sided p-value under a Binomial(20, 0.5) model. (b) Approxima...

Statistics & Math
7
0
55 people solved
Oct 13, 2025
Thumbtack logo
Thumbtack
Medium
Data Scientist

Compare list/dict; parse JSON/CSV at scale

Compare Python list and dict precisely: for append/insert/lookup/update/delete, state average and worst-case time complexity, memory implications, and...

Data Manipulation (SQL/Python)Programming LanguagesData Cleaning & Wrangling
7
0
111 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
49 people solved
Oct 13, 2025
Dropbox logo
Dropbox
Medium
Data Scientist

Explain a project with measurable impact

Choose one impactful project from your resume and deep-dive it in 8–10 minutes: define the problem and business goal, baseline and target, your precis...

Behavioral & Leadership
6
0
55 people solved
Oct 13, 2025
Capital One logo
Capital One
Medium
Data Scientist

Demonstrate ownership and navigate challenges

Behavioral deep dive: 1) Describe the most impactful modeling project you led end‑to‑end—your role, the concrete business metric moved, and one hard t...

Behavioral & Leadership
4
0
49 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Data Scientist Locked

Design and analyze end-to-end A/B test

This question evaluates experimentation design and analysis competencies for A/B testing, including metric selection, statistical interpretation, inte...

Analytics & Experimentation
4
0
33 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Data Scientist

Increase posts receiving comments via experimentation

Increase the Share of Posts That Receive a Meaningful Comment You are a data scientist for a consumer social app with posts and comments. Your goal is...

Analytics & Experimentation
5
0
39 people solved
Oct 13, 2025
Flatiron Health logo
Flatiron Health
Medium
Data Scientist

Build a robust ML pipeline

You inherit an ML pipeline that predicts next-7-day churn for users, but data quality is inconsistent and feature drift is suspected. A) Propose an en...

Machine LearningML Data Pipelines & Feature StoresModel Monitoring & Drift
14
0
109 people solved
Oct 13, 2025
Flatiron Health logo
Flatiron Health
Medium
Data Scientist

Compute sample size and significance

You are planning a two-variant A/B test with equal allocation and a binary primary metric (conversion). Baseline rate p0 = 0.045. You want to detect a...

Statistics & Math
7
0
77 people solved
Oct 13, 2025
Uber logo
Uber
Hard
Data Scientist

Design and power an incentive experiment

Experiment: Timing and Efficacy of Onboarding Benefits Context You operate a two-sided marketplace with supply-side candidates who often complete requ...

Analytics & ExperimentationExperiment Design (A/B Testing)Hypothesis Testing
15
0
96 people solved
Oct 13, 2025
Uber logo
Uber
Hard
Data Scientist

Diagnose and reduce first-action drop-offs

Funnel Drop‑Off: Instrumentation, Incentives, Fairness, and Ownership Context You lead a program where candidates must: (1) submit paperwork, then (2)...

Behavioral & Leadership
3
0
64 people solved
Oct 13, 2025
CVS Health logo
CVS Health
Medium
Data Scientist

Describe handling pressure and stakeholder conflicts

Behavioral/Scenario Questions for a Data Scientist — Technical Screen Answer concisely using STAR (Situation, Task, Action, Result) where relevant. 1....

Behavioral & LeadershipProject Deep DiveAmbiguity & Decision Making
13
0
109 people solved
Oct 13, 2025
TikTok logo
TikTok
Hard
Data Scientist Locked

Prove conversion ads value via incrementality

This question evaluates a candidate's competency in causal inference and experimentation design for advertising measurement, covering metrics and attr...

Analytics & Experimentation
2
0
59 people solved
Oct 13, 2025
Amazon logo
Amazon
Hard
Data Scientist

Measure PMF for Alexa Shopping

Define and Measure Product–Market Fit (PMF) for Alexa Shopping Context You are designing a measurement plan to assess PMF for Alexa Shopping, where cu...

Analytics & Experimentation
3
0
44 people solved
Oct 13, 2025
Amazon logo
Amazon
Hard
Data Scientist

Design an operations dashboard with justifications

Design an Operations Dashboard for Same-Day Delivery Station Performance Goal Create a real-time dashboard for a delivery-station manager to monitor a...

Analytics & Experimentation
8
0
64 people solved
Oct 13, 2025
TikTok logo
TikTok
Hard
Data Scientist

Diagnose metric drop in Ads Manager

Investigate a 15% Drop in Ad-Creation Completion Rate Context On 2025-06-10, your Ads Manager dashboard shows a 15% relative decrease in the ad-creati...

Analytics & Experimentation
13
0
89 people solved
Oct 13, 2025
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