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 ScientistDesign and analyze A/B test with interference
You must ship a News Feed ranking change where content produced by treated users can be seen by control users, creating interference and within-user c...
Analytics & Experimentation
3
0
56 people solved
Oct 13, 2025
Medium
Data ScientistEvaluate brand ads effectiveness on social media causally
Hypothesis: 'Social media (e.g., Facebook) is not effective for brand advertising compared with other channels.' You have historical multi-channel dat...
Analytics & Experimentation
2
0
50 people solved
Oct 13, 2025
Hard
Data ScientistDefine and apply Gmail user segments
Question Gmail wants to create actionable user segments to drive both product improvements and marketing/lifecycle outcomes. Propose a segmentation sc...
Analytics & Experimentation
7
0
104 people solved
Oct 13, 2025
Hard
Data ScientistMeasure 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
9
0
62 people solved
Oct 13, 2025
Hard
Data ScientistPredict and act on contract renewal risk
Predicting Enterprise Contract Renewal After a Quality Incident Context A video-conferencing provider experienced a spike in call disconnects. You nee...
Machine Learning
10
0
86 people solved
Oct 13, 2025
Medium
Data ScientistHandle extended team-matching uncertainty
Scenario: Team-Match Stall After Panel Context - You passed a company-wide panel in late February for a Data Scientist role. - First team-match meet...
Behavioral & Leadership
2
0
42 people solved
Oct 13, 2025
Hard
Data ScientistDesign an experiment for spam filtering impact
Experiment Design: Stricter Spam Filter Impact on Friend Requests Context You run a social app with a friend-request system. A stricter spam filter wi...
Analytics & Experimentation
3
0
51 people solved
Oct 13, 2025
Medium
Data ScientistCompute same-day acceptance metrics last week
Assume today is 2025-09-01; interpret 'last week' as 2025-08-25 through 2025-08-31 inclusive, using UTC dates. You have the following schema and sampl...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Medium
Data ScientistCompute 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
6
0
46 people solved
Oct 13, 2025
Medium
Data ScientistEvaluate Miami Ultrafast impact on orders
Instacart launched an Ultrafast delivery feature in Miami two months ago. You have weekly orders per geo for the past 52 weeks; Miami is treated from ...
Analytics & Experimentation
7
0
81 people solved
Oct 13, 2025
Medium
Data ScientistDetermine if players prefer local creators without experiments
You cannot run an A/B test. Define “local creators” as creators whose games use a player’s native language. Design an observational study to estimate ...
Analytics & Experimentation
8
0
101 people solved
Oct 13, 2025
Hard
Data Scientist LockedDiagnose unbiasedness in a messy A/B test
This question evaluates a data scientist's ability to diagnose unbiasedness of an intent-to-treat (ITT) estimator in A/B testing under noncompliance, ...
Analytics & Experimentation
5
0
77 people solved
Oct 13, 2025
Medium
Data ScientistDerive MLEs and conditional Normal distributions
Normal and Bivariate Normal: PDFs/CDFs, MLEs, Conditioning, and Unbiased Variance Setup - Let X1, …, Xn be i.i.d. Normal(μ, σ²). - Independently, let ...
Statistics & Math
7
0
101 people solved
Oct 13, 2025
Medium
Data ScientistAnalyze ad watch-time with Excel pivots
You are given a flat file with these columns: Date (Excel date, no time zone), UserID, AdID, WatchSeconds (integer ≥ 0), Clicks (integer ≥ 0). Using o...
Analytics & Experimentation
4
0
88 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
77 people solved
Oct 13, 2025
Medium
Data ScientistAudit flight data quality from metadata
You’re given an airline on‑time dataset and a one‑page “Metadata” slide that claims: flight_date (string, local time), dep_time/arr_time (HHMM local),...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Hard
Data ScientistCompute sample size and test duration correctly
Powering Two Online Experiments: Sample Size, Duration, and Design Defenses You are designing experiments to improve a friend-accept rate metric in a ...
Statistics & Math
3
0
63 people solved
Oct 13, 2025
Medium
Data Scientist LockedDefine and compute surge pricing metrics
This question evaluates a data scientist's competence in defining and computing marketplace pricing and operational metrics—such as demand and supply ...
Statistics & Math
7
0
75 people solved
Oct 13, 2025
Medium
Data ScientistExplain motivation and align expectations for L4 role
Behavioral Prompt: L4 IC Data Scientist — Motivation, Plan, and Expectations Context You are interviewing onsite in a Behavioral & Leadership round fo...
Behavioral & Leadership
12
0
113 people solved
Oct 13, 2025
Hard
Data ScientistExplain your ML project end-to-end
End-to-End ML Project Deep Dive (7 Parts) Assume you are describing the most complex ML project on your resume. Answer each part precisely and concret...
Machine Learning
6
0
74 people solved
Oct 13, 2025