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Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions
11.9k
Companies
569
Updated
09.07.2026
11.9k Questions 569 Companies09.07.2026

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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
Amazon logo
Amazon
Hard
Data Scientist Locked

Explain random forests, bagging, and evaluation

This question evaluates understanding of ensemble learning and model evaluation, covering Random Forest aggregation, feature subsampling, bagging vers...

Machine Learning
6
0
63 people solved
Oct 13, 2025
Uber logo
Uber
Hard
Data Scientist Locked

Design and Evaluate an Experiment on Surge

This question evaluates experiment design, causal inference, power analysis, and implementation skills relevant to pricing and supply experiments in a...

Analytics & ExperimentationExperiment Design (A/B Testing)Causal Inference
10
0
85 people solved
Oct 13, 2025
Hard
Data Scientist

Decide launch with asymmetric costs

Launch Decision Under Asymmetric Costs (Experiment p=0.10) Context You ran an A/B test on a churn‑reduction feature. The test's p‑value was 0.10 (sugg...

Analytics & Experimentation
3
0
47 people solved
Oct 13, 2025
Thumbtack logo
Thumbtack
Hard
Data Scientist

Define success metrics for Instant Book

Instant Book: Metrics, Measurement, Rollout, and Risk Plan Context You are evaluating an "Instant Book" feature that allows customers to immediately b...

Analytics & Experimentation
4
0
67 people solved
Oct 13, 2025
Meta logo
Meta
Medium
Data Scientist Locked

Apply reinforcement learning to product decisions

This question evaluates expertise in reinforcement learning and sequential decision-making for product optimization, covering MDP formulation, contras...

Machine Learning
2
0
48 people solved
Oct 13, 2025
Instacart logo
Instacart
Hard
Data Scientist Locked

Use regression vs cohorts for A/B estimation

This question evaluates a data scientist's competency in regression-adjusted causal estimation, specifying interaction terms and assessing heterogeneo...

Analytics & ExperimentationExperiment Design (A/B Testing)Causal Inference
5
0
84 people solved
Oct 13, 2025
TikTok logo
TikTok
Hard
Data Scientist Locked

Contrast LSTM and Transformer for long sequences

This question evaluates understanding of sequence-model architectures and system-level trade-offs for long-context autoregressive language models, cov...

Machine Learning
4
0
52 people solved
Oct 13, 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
46 people solved
Oct 13, 2025
Roblox logo
Roblox
Hard
Data Scientist

Apply Bayes' rule to compute posterior

A binary event \(A\) (e.g., “user is a payer” or “patient has a disease”) has prior probability \(P(A)\). You observe evidence \(B\) (e.g., a model pr...

Statistics & MathProbabilityBayesian Statistics
7
0
105 people solved
Nov 24, 2025
Roku logo
Roku
Medium
Data Scientist Locked

Explain and quantify bias-variance tradeoff

This question evaluates understanding of the bias–variance tradeoff, the expected test-error decomposition into irreducible noise, bias^2, and varianc...

Machine Learning
6
0
81 people solved
Oct 13, 2025
TikTok logo
TikTok
Hard
Data Scientist Locked

Causally measure traffic reduction effectiveness

This question evaluates skills in causal inference and quasi-experimental design, including specifying estimands, choosing RD and staggered DiD approa...

Analytics & Experimentation
3
0
44 people solved
Oct 13, 2025
Capital One logo
Capital One
Medium
Software EngineerIntern

Predict Tip Percentage

Predict Tip Percentage Create a derived target for tip as a percentage of total fare, then design and evaluate a predictive model for that target usin...

Machine Learning
3
0
27 people solved
Sep 27, 2020
Capital One logo
Capital One
Hard
Data Scientist

Evaluate merchant partnership for high-value customers

Partnership evaluation to acquire high‑LTV cardholders: Home‑sharing (RH) vs Big‑box retailer Context C1, a credit‑card issuer, is considering marketi...

Analytics & Experimentation
5
0
65 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Data Scientist Locked

Evaluate and prioritize Facebook Groups

This question evaluates product analytics, experimentation design, causal inference, KPI hierarchy and metric-definition skills, and quantitative prio...

Analytics & Experimentation
4
0
37 people solved
Oct 13, 2025
Medium
Data Scientist

Implement KNN from scratch

Without using ML libraries, implement k-Nearest Neighbors for classification. Requirements: (a) Support Euclidean and cosine distances; (b) Allow tie-...

Coding & Algorithms
5
0
46 people solved
Oct 13, 2025
Meta logo
Meta
Hard
Data Scientist Locked

Design and validate an ads feed experiment

This question evaluates a data scientist's competency in experiment design, causal inference, and applied statistical analysis for product experimenta...

Analytics & ExperimentationExperiment Design (A/B Testing)Hypothesis Testing
9
0
77 people solved
Oct 13, 2025
Instacart logo
Instacart
Medium
Data Scientist

Describe cross-team collaboration approach

Cross-Functional Collaboration, Cadence, Artifacts, and Conflict Resolution Context: You are interviewing for a Data Scientist role in a consumer mark...

Behavioral & Leadership
5
0
65 people solved
Oct 13, 2025
Coinbase logo
Coinbase
Medium
Data Scientist

Show culture add at Coinbase

Behavioral Prompt — Culture Add Examples for Coinbase Values Context: You are interviewing for a Data Scientist role in a technical screen focused on ...

Behavioral & LeadershipMotivation & FitConflict & Collaboration
6
0
91 people solved
Oct 13, 2025
Meta logo
Meta
Medium
Data Scientist

Analyze ad targeting expectations and distributions

Ads Profit, Variance Decomposition, and Exponential Timing Context: You run an ad slot with two user segments. On each eligible page view (impression ...

Statistics & Math
12
0
84 people solved
Oct 13, 2025
TikTok logo
TikTok
Medium
Data Scientist Locked

Design a creator posting-frequency experiment

This question evaluates experimental design and causal inference competencies for a Data Scientist, including precise metric definition, randomization...

Analytics & Experimentation
4
0
44 people solved
Oct 13, 2025
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