Practice real SQL and Python interview questions from top tech companies. Write code, run it instantly in your browser, and track your progress.
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How it works
Browse questions by topic, difficulty, and language. Filter for SQL joins, Python pandas, window functions, and more.
Solve problems in our in-browser editor. Your code runs instantly — Python via WebAssembly, SQL against real databases. No setup needed.
See which topics you've mastered and where you need practice. Your dashboard shows progress by difficulty and topic area.
Built for data scientists
Generic coding platforms don't prepare you for data science interviews. Our questions are written by someone with a PhD in Machine Learning who has been on both sides of the interview table.
Write queries against actual tables with real data. JOINs, CTEs, window functions — the stuff interviewers actually ask.
Full Python runtime in your browser via WebAssembly. Import pandas, numpy, and scikit-learn — no installation required.
Beyond syntax — correlation, feature engineering, KNN implementation. The conceptual questions that separate good from great candidates.
The platform
Split-pane IDE with syntax highlighting, auto-formatting, and keyboard shortcuts. Run and submit with Ctrl+Enter.
See sample test cases to build your solution, then submit to run against hidden tests. Per-test pass/fail feedback shows exactly where you stand.
Every problem includes a detailed walkthrough covering approach, key concepts, complexity analysis, and common pitfalls.
Filter by Netflix, Airbnb, Google, and more. Practice the exact types of questions asked at your target company.
Stuck? Reveal hints one at a time to nudge you in the right direction without giving away the answer.
Track your progress with an engagement heatmap, difficulty breakdown, and recent submissions. See exactly where to focus.
Why it's worth it
Data science is one of the highest-paying fields in tech. At $20/mo, you're investing less than a lunch to land a six-figure career.
$130k
Median US salary
Data scientists, Bureau of Labor Statistics
$175k+
Top tech companies
Average base at FAANG and major tech firms
$250k+
Senior-level TC
Total compensation for senior data scientists
#1
Fastest-growing field
Top career in tech for growth and demand
Simple pricing
Start free, upgrade when you're serious. The average data science salary is $150k+ — this pays for itself on day one.
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Every day you wait is a day you could be practicing. Start with free problems — no credit card, no commitment.
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