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 Scientist LockedHandle p≈n linear regression with L1
This question evaluates competence in high-dimensional linear regression, penalized estimation (L1/L2/elastic net), preprocessing and feature handling...
Machine Learning
15
0
101 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate invent-and-simplify and customer communication
Behavioral: Two STAR Stories (Data Scientist, Technical Screen) Provide two concise STAR stories that demonstrate your ability to invent/simplify and ...
Behavioral & Leadership
3
0
52 people solved
Oct 13, 2025
Hard
Data ScientistDiagnose and fix underperforming ML model
Rapidly Improving Recall Under Class Imbalance (One-Day Plan) Context You inherit a binary fraud detection model with severe class imbalance (positive...
Machine Learning
8
0
78 people solved
Oct 13, 2025
Medium
Data ScientistDifferentiate and control Type I/II errors
A/B Test Powering and Error Control (Two-Proportion Z-Test) Context: You are planning a two-arm A/B test on sign-up conversion. The current baseline c...
Statistics & Math
7
0
54 people solved
Oct 13, 2025
Medium
Data ScientistContrast UI vs backend testing; design UI-change test cases
Part A — Differentiate UI vs backend testing: For a single-page web app backed by a BFF (backend-for-frontend) that calls a payment API, explain preci...
Behavioral & Leadership
2
0
44 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate leadership under ambiguity
Describe a time you faced an open-ended, lightly guided interview or project where the counterpart had a strong accent and offered little direction. H...
Behavioral & Leadership
7
0
80 people solved
Oct 13, 2025
Medium
Data ScientistDescribe resolving a high-stakes research disagreement
Describe a time you and a stakeholder strongly disagreed on the framing or interpretation of a technical problem (e.g., a probability/statistics assum...
Behavioral & Leadership
6
0
83 people solved
Oct 13, 2025
Medium
Data ScientistCompare Bayesian and frequentist decisions
A/B Test With Beta–Binomial Posteriors and Decision-Making Under Asymmetric Costs You ran a two-arm A/B test on a binary KPI with independent Beta(1, ...
Statistics & Math
10
0
136 people solved
Oct 13, 2025
Medium
Data ScientistReduce variance with covariate adjustment
Experiment Design and CUPED/Regression Adjustment You are running a randomized A/B test with outcome Y. You also have a pre-period covariate X (measur...
Analytics & Experimentation
5
0
56 people solved
Oct 13, 2025
Hard
Data Scientist LockedHandle novelty and residual effects
This question evaluates a data scientist's competency in experiment design and causal inference for online metrics under temporal dynamics, specifical...
Analytics & Experimentation
3
0
29 people solved
Oct 13, 2025
Medium
Data Scientist LockedInfer distribution and choose robust statistics
This question evaluates a candidate's ability to infer underlying distributions from summary statistics and apply robust statistical reasoning includi...
Statistics & Math
10
0
104 people solved
Oct 13, 2025
Medium
Data ScientistMitigate risk if no team matches
Contingency Plan When Team Match Stalls for 3+ Weeks Context You are a Data Scientist candidate who has passed onsite interviews and entered team-matc...
Behavioral & Leadership
5
0
57 people solved
Oct 13, 2025
Hard
Data ScientistChoose and compute recommender evaluation metrics
Restaurant Recommender: Offline Evaluation and Modeling Context: You are scoring p(y=1|x) with logistic regression to predict if a user will engage wi...
Machine Learning
6
0
63 people solved
Oct 13, 2025
Medium
Data ScientistOptimize precision–recall under class imbalance
You have extreme class imbalance (positive rate ~1%). You score 12 examples as follows (id, true_label, score): A,1,0.92; B,0,0.90; C,0,0.88; D,0,0.70...
Machine Learning
11
0
89 people solved
Oct 13, 2025
Medium
Data ScientistDecide and test Groupon program incrementality
Before signing, list the concrete factors and metrics you would evaluate to decide whether to participate in the coupon program, including but not lim...
Analytics & Experimentation
6
0
77 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate stakeholder communication and influence
Describe a time you influenced a cross-functional decision using data when stakeholders initially disagreed with your recommendation. Include: the dec...
Behavioral & Leadership
3
0
47 people solved
Oct 13, 2025
Medium
Data ScientistAdd a conditional column in Python
Using pandas, add a derived column to a table based on multiple conditions with strict precedence and missing-value handling. Given the sample DataFra...
Data Manipulation (SQL/Python)
0
0
8 people solved
Oct 13, 2025
Medium
Data Scientist LockedExplain linear regression to non‑technical stakeholders
This question evaluates understanding of linear regression fundamentals and related competencies, including defining target, features, coefficients, i...
Machine Learning
8
0
75 people solved
Oct 13, 2025
Medium
Data ScientistDecide between two vendors under constraints
You have two third‑party search vendors, A and B, plus historical order‑level data: lead_time_days, unit_price, on_time_rate, defect_rate, min_order_q...
Machine Learning
3
0
67 people solved
Oct 13, 2025
Hard
Data ScientistReplace legacy ads model safely
Facebook Ads Ranking Replacement: M0 to M1 You are asked to replace a legacy ads ranking model (M0) with a new model (M1) in a large-scale feed ads sy...
Machine Learning
7
0
52 people solved
Oct 13, 2025