Master Data SkillsThrough Practice
Practice real interview questions, build portfolio projects, and validate your code — everything you need to land your dream data role.
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Everything You Need to Succeed
From practice questions to portfolio projects — we've got your entire interview prep covered.
Interview Coding Questions
1000+ real interview questions. Practice SQL, Python, R, and more.
Interview Concepts
Master product sense, statistics, and behavioral questions.
Data Labs
Data projects powered by our cloud hosted Python notebooks, no setup required.
AI StrataTools
Validate and optimize your code in real environments.
Performance Insights
Track your skills, benchmark against the community, and build your public data profile.
Learning Paths
Personalized journeys for SQL, Python, and Data Science.
Practice Questions from Top Companies
Master the exact questions asked at Google, Meta, Amazon, and 200+ other companies. From coding challenges to conceptual interviews — we've got you covered.
Interview Coding Questions
1000+ real coding challenges
Practice SQL and Python coding questions with our interactive code editor. Write, run, and validate your solutions in real-time.
SQL Dialects
Python Libraries
Other Languages
Interview Concepts
Master non-coding interview rounds
Prepare for the full interview process with conceptual questions that test your analytical thinking, business acumen, and technical knowledge.
Question Types
Build Real Data Projects in Our Cloud Hosted Notebooks
Practice real take-home assignments from top companies. Build your data portfolio and share it directly from your Performance page — no local setup required.
- Real take-home assignments from top tech companies
- Cloud-hosted Python notebooks — no installation needed
- Build and showcase your data portfolio for interviews
- Share your work publicly from your Performance page
Track Your Performance & Build Your Reputation
Track every question you solve, see how you rank against 500K+ members, link GitHub, and build a public profile that gets you noticed.
Track Progress
Monitor your growth across SQL, Python, and analytics
Community Rankings
See how you stack up against 500K+ members
Public Profile
Share your achievements and get discovered
Portfolio Integration
Link GitHub repos and showcase your projects
AI StrataTools run your code — so you don't run into errors
Validate and optimize your Python and SQL by running it in real environments, delivering reliable results and reducing AI hallucinations.
Transformed Code:
SELECT
customer_id,
order_date,
ROW_NUMBER() OVER (
PARTITION BY customer_id
ORDER BY order_date DESC
) AS rn
FROM orders;Loved by Data Scientists
Join thousands who landed jobs at top tech companies
"StrataScratch has been super helpful. I started with barely being able to finish an easy SQL query to no problem solving most of the medium level in just a few days."
Kyle
Twitch
"StrataScratch is hands down the best platform if you are preparing for or am working as a data analyst/scientist/engineer. Happy to share that I have gotten an offer from Amazon as a Data Analyst."
Triman
Amazon
"I really wanted to get into data analytics and data science but never really understood the importance of SQL. The questions are really very realistic and I was asked similar questions in my coding rounds."
Hemant R
Credit Karma
"SQL is something that is super important and plays a key role in Data Analysis. I used to practice 2-3 SQL problems everyday. The discussion forum and solution with clear understanding cleared my barriers."
Vikram
Microsoft
"StrataScratch and the community really helped me prep for the interview — I ended up getting the Data Scientist internship!"
Joe
Microsoft
"StrataScratch is awesome! It's the first place I found that allows you to use python in addition to SQL. The Facebook questions were quite similar to the ones that I saw in my interview today."
Ryan
Level Up Your Data Skills
Free guides, tutorials, and resources from our team
How to Iterate Over a Dictionary in Python?
We explore fundamental concepts in Python 'Iterate' over a 'Dictionary' (dict) and learn iteration methods to search, update, modify, and transform data.
Shivani Arun-December 10, 2025
Career Path for Artificial Intelligence Engineers
Artificial intelligence engineers are a very hot commodity in today's data jobs market. Learn everything you need to know about an AI engineering career.
Nathan Rosidi-December 3, 2025How to Conduct a T-Test in R for Data Analysis
Nathan Rosidi-November 19, 2025How to Create Pivots in SQL (with examples)
Shivani Arun-November 13, 2025Creating a Python Linked List Step by Step
Nathan Rosidi-November 7, 2025Ready to Land Your Dream Data Role?
Start practicing with real interview questions today. No credit card required.