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Created by interviewers from top companies like Google and Meta for data engineers, data scientists, quants and ML/AI Engineers

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The complete system

The data interview
isn't one interview.

SQL, statistics, ML theory, product sense, and behavioral โ€” all in the same loop, for the same role. Most candidates prepare for two of those. We built a platform that covers all of it, across every data role.

4,000+
Interview questions
10+
Video courses
100K+
Members worldwide
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4,000+ questions

The most comprehensive question bank for data roles.

SQL, statistics, ML theory, product sense, and behavioral โ€” every category, every role, every major company. No other platform covers the breadth.

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Interview Questions

Master 4,443 questions asked by top companies

Data Scientist1,875ML Engineer866Data Analyst627Quant Analyst1,259AI Engineer194Data Engineer210
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Title
Company
Topic
Difficulty
1.Customer Lifetime Value
Amazon
Amazon
Machine Learning
MEDIUM
2.A/B Test Power Analysis
Meta
Meta
Statistics
EASY
3.Feature Importance Ranking
Google
Google
ML Theory
MEDIUM
4.Recommendation System Design
Netflix
Netflix
ML Systems
HARD
5.SQL Funnel Drop-off Analysis
Uber
Uber
SQL
EASY
ML coding engine

Write and run Python in your browser.

100+ ML coding questions with a live Python executor. Implement algorithms, run against test cases, and study solutions from engineers at Google and Meta.

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# Implement Mean Squared Error
import numpy as np
def mse(y_true, y_pred):
diff = y_true - y_pred
return np.mean(diff ** 2)
โœ“3/3 test cases passedยท 0.2ms
Video courses

Structured courses for every data role.

AB testing, statistics, ML theory, product sense โ€” each course built with video lessons, problem sets, and worked examples from real interviews.

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AB Testing
AB Testing
82 lessons 22K students
Data ScientistData Analyst
Applied Statistics
Applied Statistics
48 lessons 15K students
Data ScientistData Engineer
Case In Point
Case In Point
62 lessons 25K students
Data ScientistML Engineer
Product Sense
Product Sense
45 lessons 18K students
Data ScientistData Analyst
SQL Mastery
SQL Mastery
100 lessons 30K students
Data AnalystData Engineer
ML System Design
ML System Design
55 lessons 12K students
ML EngineerAI Engineer
1-on-1 coaching

Expert feedback, targeted to your gaps.

Personalized sessions with coaches who have run interviews at Google and Meta. Direct feedback, targeted drills, no fluff.

Dan Lee
Dan Lee
Former Google ยท Data Scientist
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Community

Never prep alone.

Slack community with 1,200+ active members โ€” find mock interview partners, share tips, and hold each other accountable.

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Your next data interview is closer than you think.

4,000+ questions, live classes, and expert coaching โ€”everything you need to walk in prepared.