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 ScientistBuild and evaluate a full ML pipeline
You must predict both (1) probability that a user will spend >$0 in the next 7 days (classification) and (2) expected spend in the next 7 days (regres...
Machine Learning
13
0
135 people solved
Oct 13, 2025
Medium
Data ScientistDesign robust group size limiting for calls
Design the admission-control and enforcement algorithm to limit group-call size under real-world race conditions. Constraints: multiple SFU edges in m...
Coding & Algorithms
7
0
55 people solved
Oct 13, 2025
Medium
Data ScientistImplement streaming autocomplete under tight memory
Build an autocomplete service: Input: a list of up to 5,000,000 UTF-8 words (may include accents and hyphens), each with an integer popularity score t...
Coding & Algorithms
5
0
52 people solved
Oct 13, 2025
Hard
Data ScientistExperimentally evaluate jogging-route recommendations
Design an Evaluation for Jogging Route Recommendations in Maps Objective Design an A/B test and evaluation framework for recommending optimal jogging ...
Analytics & Experimentation
11
0
127 people solved
Oct 13, 2025
Hard
Data ScientistQuantify build-vs-buy training decision
Quantitative Decision Framework for Selecting a New Employee Training Program Context Your company must choose one of three ways to launch a new emplo...
Analytics & Experimentation
2
0
37 people solved
Oct 13, 2025
Medium
Data ScientistDraft a non-pushy follow-up email
Follow-Up Email After Team-Match (3 Business Days) Context: You are a candidate for a Data Scientist role. Three business days after an onsite team-ma...
Behavioral & Leadership
3
0
46 people solved
Oct 13, 2025
Medium
Data ScientistCharacterize and compare transfer-count distributions over time
P2P Transfer Counts in First 30 Days: Distribution, Summaries, and Evolution Context: For a new user cohort, define X as each user’s number of peer-to...
Statistics & Math
9
0
71 people solved
Oct 13, 2025
Medium
Data ScientistCompute posterior spam risk from flags
A binary classifier flags spammy requesters. Last week the base rate of spam among all requesters was 12%. The classifier has true positive rate (TPR)...
Statistics & Math
7
0
75 people solved
Oct 13, 2025
Medium
Data ScientistChoose regularization norms and model formulations
Regularization and model choice. 1) For linear and logistic regression, write the objective functions with L0, L1, L2, and L-infinity penalties in bot...
Machine Learning
5
0
70 people solved
Oct 13, 2025
Medium
Data ScientistDesign a clustered notification experiment with guardrails
You work on a mobile travel app (think TripAdvisor-like) that will test a new push-notification policy recommending nearby attractions. Design a rigor...
Analytics & Experimentation
2
0
38 people solved
Oct 13, 2025
Medium
Data ScientistExplain 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
2
0
27 people solved
Oct 13, 2025
Medium
Data Scientist LockedEstimate sales impact from reviews causally
This question evaluates a data scientist's competency in causal inference, experimental design, observational modeling, and statistical reporting for ...
Analytics & Experimentation
5
0
61 people solved
Oct 13, 2025
Medium
Data Scientist LockedMeasure causal impact of YouTube ads
This question evaluates causal inference and experimental design skills for marketing measurement, including competency in identifying confounders, de...
Analytics & Experimentation
19
0
141 people solved
Oct 13, 2025
Medium
Data ScientistInfluence a senior partner with data
Describe a time you had to influence a senior cross-functional leader to change a launch plan based on ambiguous A/B test results. Be specific: the de...
Behavioral & Leadership
7
0
52 people solved
Oct 13, 2025
Hard
Data ScientistDesign and analyze a banner A/B test
A/B Test Design: Home-Page Banner You are deciding whether to add a home-page banner in a consumer app. Design and analyze the A/B test end-to-end. As...
Analytics & Experimentation
6
0
54 people solved
Oct 13, 2025
Hard
Data ScientistExplain Random Forest randomness and implications
Random Forest — Rigor and Practical Choices Context: You are building a binary classifier with a Random Forest. The dataset has 100,000 rows, 100 feat...
Machine Learning
8
0
63 people solved
Oct 13, 2025
Hard
Data ScientistDecide when CTR falls but revenue rises
Ads-Ranking A/B Test: Decision, Decomposition, Diagnostics, and Exec Readout Context You ran a user-level A/B test of a new ads-ranking model. The tre...
Analytics & Experimentation
9
0
75 people solved
Oct 13, 2025
Medium
Data ScientistDefine and compute shop visibility in SQL
You own the 'shop visibility' KPI for a marketplace. Define a precise metric and write SQL to compute it over the last 7 days (use today = 2025-09-01,...
Data Manipulation (SQL/Python)
6
0
66 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL: sum values ≤ each row’s value
Given table numbers(id INT PRIMARY KEY, val INT), return for every row the sum of all val across the entire table that are ≤ that row’s val (i.e., com...
Data Manipulation (SQL/Python)
7
0
57 people solved
Oct 13, 2025
Hard
Data ScientistDiagnose uplift drop in email A/B tests
Personalized Product Emails Experiment — Design, Sizing, and Debugging Conflicting Reruns Context An e-commerce company plans to A/B test personalized...
Analytics & Experimentation
4
0
66 people solved
Oct 13, 2025