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 LockedAssess Demand for Group Video Chat
This question evaluates skills in product analytics, causal inference from observational data, demand estimation, survey design, and executive-level s...
Analytics & Experimentation
7
0
79 people solved
Mar 14, 2026
Easy
Data AnalystWrite SQL for content-view analytics
Context You work with page-view event logs and need to compute several engagement/usage summaries. Assume a single table: page_views | column | type |...
Data Manipulation (SQL/Python)
2
0
33 people solved
Jan 17, 2026
Easy
Data Scientist LockedHow to estimate feature impact on usage time
This question evaluates causal inference and observational analytics skills—specifically defining an estimand, designing primary, diagnostic, and guar...
Analytics & Experimentation
22
0
259 people solved
Jan 17, 2026
Medium
Data Scientist LockedAnalyze trading RFQ competitiveness data
This question evaluates a candidate's skills in exploratory data analysis, Excel-based feature engineering, basic statistical modeling, and interpreta...
Machine Learning
8
1
158 people solved
Oct 14, 2025
Easy
Data ScientistMatch Netflix profit; derive required subscribers
Subscription Profit and Break-even (All Monthly) Assume all figures are monthly and "M" denotes millions. We model subscription profit as: - Profit = ...
Statistics & Math
4
0
74 people solved
Oct 13, 2025
Medium
Data ScientistDesign late-tolerant streaming window aggregator
You receive an unbounded stream of events: (event_time, user_id, category). Events may arrive up to 48 hours late and are not ordered by time. Design ...
Coding & Algorithms
8
0
81 people solved
Oct 13, 2025
Medium
Data ScientistDesign pricing and multivariate button experiments
You join a B2B SaaS firm with three public tiers (Basic $25/month, Pro $50/month, Enterprise = sales-quoted). The PM asks for a 2‑week A/B test to rai...
Analytics & Experimentation
10
0
125 people solved
Oct 13, 2025
Medium
Data ScientistGenerate binomial matrix and column-normalize
Using Python with NumPy, generate a 100×100 matrix of Binomial(n = 10, p = 0.3) draws with a fixed random seed, then normalize each column so it sums ...
Data Manipulation (SQL/Python)
0
0
10 people solved
Oct 13, 2025
Medium
Data ScientistCompute sample sizes and error control
Using the Biker experiment context, compute required sample sizes and describe error control under practical constraints. Show formulas and numeric an...
Statistics & Math
10
0
86 people solved
Oct 13, 2025
Hard
Data ScientistPlan and analyze a ranking A/B test
Experiment Design: New Search Ranking Feature Context You are designing, running, and analyzing an online controlled experiment to evaluate a new sear...
Analytics & Experimentation
15
0
148 people solved
Oct 13, 2025
Medium
Data ScientistDerive distribution of an inverse transform
Change of Variables via the Logistic Map You are given a random variable X with density f_X supported on (0, 1). Define the strictly increasing logist...
Statistics & Math
3
0
63 people solved
Oct 13, 2025
Hard
Data ScientistDesign city home-price prediction system
End-to-End System Design: Predict Residential Property Sale Prices Context You are tasked with building a production-grade machine learning system to ...
Machine Learning
8
0
78 people solved
Oct 13, 2025
Medium
Data ScientistWrite SQL for profit, growth, retention
Write ANSI-SQL (PostgreSQL preferred) for the tasks below. Assume all timestamps are UTC and that "today" = 2025-09-01. Schema: - products(product_id ...
Data Manipulation (SQL/Python)
6
0
98 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate cross-functional collaboration and influence
Behavioral Prompt — Cross-Functional Collaboration (STAR) Provide a specific example of cross-functional collaboration with a Product Manager (PM) and...
Behavioral & Leadership
8
0
69 people solved
Oct 13, 2025
Medium
Data Scientist LockedExplain 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
5
0
73 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate calculated risk and deep-dive leadership
Describe one project where you took a calculated risk that was outside your formal responsibilities. Context: What was the business or research goal, ...
Behavioral & Leadership
4
0
50 people solved
Oct 13, 2025
Medium
Data ScientistDemonstrate leadership in data ambiguity
Describe a time you inherited an underperforming metric or model, disagreed with the team’s preferred fix, yet had to recommend a decision under a tig...
Behavioral & Leadership
6
0
56 people solved
Oct 13, 2025
Medium
Data ScientistCompute p-values, probabilities, and regularization choices
Answer all parts. A) Hand‑compute a two‑sided p‑value comparing two means using Welch’s t‑test. Sample A: n1=20, mean1=5.2, sd1=1.1. Sample B: n2=24, ...
Statistics & Math
14
0
189 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
60 people solved
Oct 13, 2025
Hard
Data ScientistEvaluate 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
4
0
55 people solved
Oct 13, 2025