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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
DoorDash logo
DoorDash
Hard
Data Scientist

Diagnose LA completed-order drop and design experiment

LA Dinner-Period Orders Down 12% WoW: Diagnose and Validate Root Cause Context You are analyzing a weekly decline in a two-sided delivery marketplace....

Analytics & ExperimentationMetric DiagnosticsCausal Inference
15
0
108 people solved
Oct 13, 2025
Meta logo
Meta
Medium
Data Scientist

Model user-level ad impression allocation

Random Assignment of Ad Impressions to Users Context - There are X distinct users and Y ad impressions (X ≥ 1, Y ≥ 0 integers). - Each impression is i...

Statistics & Math
8
0
85 people solved
Oct 13, 2025
Expedia logo
Expedia
Hard
Data Scientist

Lead alignment under ambiguity and pressure

Behavioral/Leadership Case: Resolving KPI Misalignment Under Time Pressure Context You are a data scientist preparing for an onsite interview. Multipl...

Behavioral & Leadership
7
0
63 people solved
Oct 13, 2025
Thumbtack logo
Thumbtack
Medium
Data Scientist Locked

Optimize red-ball draw probability, prove optimality

This question evaluates probabilistic reasoning, optimization and mathematical proof skills by asking how to allocate red and blue balls across two bo...

Statistics & Math
8
0
80 people solved
Oct 13, 2025
Thumbtack logo
Thumbtack
Medium
Data Scientist

Write monthly new-vs-returning requests SQL

Given the schema and sample data below, write a single PostgreSQL query (no dynamic SQL) that returns, for every calendar month present in requests, t...

Data Manipulation (SQL/Python)
4
0
36 people solved
Oct 13, 2025
Thumbtack logo
Thumbtack
Medium
Data Scientist

Compute weekly 3-week rolling sums in SQL

Using PostgreSQL, write a single query that outputs, for each calendar week in a given range, the sum of amounts in that week and a rolling sum over t...

Data Manipulation (SQL/Python)
1
0
28 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Data Scientist Locked

Measure notification impact and set guardrails

This question evaluates causal inference, experiment design, metric specification and attribution, statistical power calculation, and long-term monito...

Analytics & Experimentation
2
0
24 people solved
Oct 13, 2025
Coinbase logo
Coinbase
Hard
Data Scientist

Diagnose a 20% retail revenue drop

E-commerce Revenue Drop Diagnosis Case Context Week T net revenue is down 20% versus the prior 4-week moving-average baseline. You have weekly e-comme...

Analytics & ExperimentationMetric DiagnosticsBusiness Case Analysis
11
0
109 people solved
Oct 13, 2025
Meta logo
Meta
Medium
Data Scientist

Choose group-call participant cap via distribution

Group Call Cap Decision: QoS vs Reach You are deciding whether to cap the maximum number of participants in a group call. You have the past 28-day dis...

Statistics & Math
7
0
50 people solved
Oct 13, 2025
Medium
Data Scientist

Find and fix metric drops systematically

Investigating a YoY Drop in Weekly Average Likes per User Context You are a Data Scientist evaluating a social app where the weekly average likes per ...

Analytics & Experimentation
3
0
52 people solved
Oct 13, 2025
Hard
Data Scientist Locked

Design a hybrid marketplace fraud system

This question evaluates competency in designing hybrid fraud detection systems, covering feature engineering across text, image, graph and telemetry s...

Machine Learning
3
0
46 people solved
Oct 13, 2025
Hard
Data Scientist

Translate goals into robust product metrics

Analytics & Experimentation: Metric Design and Validation Context You are a Data Scientist working on analytics and experimentation. You are given bus...

Analytics & Experimentation
6
0
53 people solved
Oct 13, 2025
TikTok logo
TikTok
Hard
Data Scientist

Design robust A/B test with interference and seasonality

Experiment Design: Redesigned Onboarding with Network Effects and Weekly Seasonality Background You are launching a redesigned onboarding flow for a c...

Analytics & ExperimentationExperiment Design (A/B Testing)Sequential & Adaptive Testing
13
0
123 people solved
Oct 13, 2025
Boston Consulting Group logo
Boston Consulting Group
Medium
Data Scientist

Achieve 0.95 precision via thresholding

Deploying a High-Precision Classifier on an Imbalanced Dataset You are given a binary classification problem with 50,000 samples and ~5% positives. Th...

Machine Learning
11
0
82 people solved
Oct 13, 2025
Boston Consulting Group logo
Boston Consulting Group
Medium
Data Scientist Locked

Build a leak-free sklearn pipeline

This question evaluates a candidate's ability to construct a leak-free scikit-learn pipeline encompassing column-wise preprocessing, imbalanced binary...

Machine Learning
10
0
95 people solved
Oct 13, 2025
Amazon logo
Amazon
Hard
Data ScientistSenior+ Locked

Design fraud detection across channels with unknowns

This question evaluates a data scientist's competence in designing and operationalizing multi-channel fraud detection systems, covering cost-sensitive...

Machine Learning
8
0
64 people solved
Oct 13, 2025
Instacart logo
Instacart
Medium
Data Scientist

Define what you seek next, with trade-offs

Behavioral & Leadership — Role Fit, Trade‑offs, and 90‑Day Fit Check (Data Scientist) Task Articulate what you need to thrive in your next Data Scient...

Behavioral & Leadership
5
0
85 people solved
Oct 13, 2025
Medium
Data Scientist

Decide goal under ambiguity

Choose the Primary Goal for a New Subscriber-Only Benefit You are the PM/data lead for a subscription product planning a new subscriber-only benefit. ...

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

Estimate CTR lift with binomial tests and errors

A/B Test Inference, Peeking, and Multiple Comparisons You run a two-arm A/B test of click-through rate (CTR). - Control: n_c = 10,000,000 impressions,...

Statistics & MathExperiment Design (A/B Testing)Hypothesis Testing
7
0
105 people solved
Oct 13, 2025
Capital One logo
Capital One
Hard
Data Scientist

Design and analyze ad A/B test

A/B Test Analysis Plan: New Ad-Ranking Algorithm (B) vs. Production (A) Context: You are evaluating a new ad-ranking algorithm (B) against the current...

Analytics & ExperimentationExperiment Analysis & ReadoutHypothesis Testing
5
0
97 people solved
Oct 13, 2025
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