Interview Questions
Practice the exact questions companies are asking right now.
Questions
10.0k
Companies
520
Updated
08.21.2026
10.0k Questions 520 Companies08.21.2026
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_
"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"
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
"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."
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
"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."
CarlosFull Stack, Shopify
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
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."
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
"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."
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
"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."
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
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
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
Role
Medium
Data ScientistTest two models' proportions for significance
Two search models, A and B, were each used once by 100 distinct users (one query per user). Success is defined per query by your composite metric (suc...
Statistics & Math
5
0
49 people solved
Oct 13, 2025
Medium
Data ScientistDesign B2C chatbot success metrics and test plan
You own 'euro-chat', a B2C customer-support chatbot that aims to deflect agent contacts while preserving customer satisfaction. Design a rigorous succ...
Analytics & Experimentation
4
0
51 people solved
Oct 13, 2025
Hard
Data ScientistDiagnose cold-food spike and design experiments
Cold Food Complaints: Metrics, Diagnosis, and Experiment Design Context and assumptions: - You are analyzing a spike in “food arrived cold” complaints...
Analytics & Experimentation
15
0
125 people solved
Oct 13, 2025
Medium
Data ScientistBuild a leak-free sklearn churn pipeline
Take‑Home ML Task: Reproducible Subscription Classification Pipeline You are given a daily user-level dataset and must build a reproducible Python (sc...
Machine Learning
13
0
100 people solved
Oct 13, 2025
Medium
Data ScientistChoose clustering vs regression; explain KNN
When would you use clustering vs. regression on a business problem with partially labeled outcomes? Specify the decision criteria (label availability,...
Machine Learning
6
0
76 people solved
Oct 13, 2025
Medium
Data ScientistRun org-safe online experiment for recommender
Propose an online experimentation plan to evaluate the file recommender in production across multiple organizations where collaborators can influence ...
Analytics & Experimentation
5
0
42 people solved
Oct 13, 2025
Medium
Data ScientistChoose and justify ML algorithms for tabular prediction
You must choose an algorithm for tabular prediction of arrival delay under these constraints: 500k rows, 120 features (mixed numeric/categorical with ...
Machine Learning
3
0
62 people solved
Oct 13, 2025
Hard
Data ScientistDesign ETA prediction for Uber rides
System Design: Real‑Time Pickup and Drop‑off ETA Prediction Context: You’re designing an end‑to‑end system that predicts pickup and drop‑off ETAs at t...
Machine Learning
14
0
144 people solved
Oct 13, 2025
Hard
Data Scientist LockedDefine ride success metric for Uber
This question evaluates skills in defining product-level KPIs, statistical validation, and experimental design for an on-demand mobility service, cove...
Analytics & Experimentation
11
0
97 people solved
Oct 13, 2025
Hard
Data ScientistExplain and validate A/B test assumptions
A/B Test Validity: Core Assumptions, Violations, Diagnostics, and Mitigations You are designing and evaluating an online A/B test for a large, multi-s...
Analytics & Experimentation
14
0
153 people solved
Oct 13, 2025
Medium
Data ScientistImplement anagram check and stable deduplication
Part A — Anagram checker: Write a function is_anagram(a: str, b: str, locale: str = 'en') -> bool that returns True iff a and b are anagrams under the...
Coding & Algorithms
4
0
52 people solved
Oct 13, 2025
Medium
Data ScientistModel schema and query new-market readiness
Assume today is 2025-09-01. You are given (or can propose) a minimal schema to assess new-market readiness and early performance. Use the schema below...
Data Manipulation (SQL/Python)
1
0
15 people solved
Oct 13, 2025
Hard
Data ScientistHandle challenges in MMM/MMX
MMM Fragility Diagnosis and Remediation Plan (Weekly, 156 Weeks) Context You inherit a weekly Marketing Mix Model (MMM/MMX) with 156 weeks of data. Th...
Machine Learning
3
0
52 people solved
Oct 13, 2025
Hard
Data ScientistDesign classification under missingness and imbalance
30-Day Readmission Classifier: End-to-End Plan Context: You are building a binary classifier to predict 30-day readmission using claims and EHR featur...
Machine Learning
6
0
88 people solved
Oct 13, 2025
Hard
Data Scientist LockedCompute robust inference under skew and outliers
This question evaluates a data scientist's competency in robust statistical inference for A/B testing, covering handling of skewed continuous outcomes...
Statistics & Math
34
0
347 people solved
Oct 13, 2025
Hard
Data Scientist LockedChoose tests under non‑normal, unequal variance
This question evaluates understanding of statistical inference for heavy‑tailed, heteroskedastic A/B test metrics, covering CLT conditions for t‑tests...
Statistics & Math
8
0
134 people solved
Oct 13, 2025
Hard
Data ScientistDesign recommendations objective balancing growth and monetization
Design a Multi-Objective Recommender for Long-Form Content You are designing the ranking objective and measurement plan for a long-form content recomm...
Machine Learning
9
0
64 people solved
Oct 13, 2025
Hard
Data Scientist LockedDiagnose and fix flawed model fit
This question evaluates a data scientist's competency in applied supervised learning diagnostics, including feature encoding, feature scaling, class i...
Machine Learning
8
0
66 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute probability second largest is below 2/3
This question evaluates understanding of order statistics, uniform probability distributions, and probabilistic reasoning, specifically the ability to...
Statistics & Math
3
0
40 people solved
Oct 13, 2025
Medium
Data ScientistDescribe a high-impact project via STAR
Using STAR, walk me through one project you led that measurably changed a core business metric. Include: Situation (company, product, date range), Tas...
Behavioral & Leadership
3
0
35 people solved
Oct 13, 2025