Interactive Coding Courses

Learn by doing — write and run real code right in your browser, one small step at a time.

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AI Engineering

Build the deterministic engineering around language models — tokenizers, retrieval, MCP tool routers, and agents — all running for real in your browser.

53 lessons Runs real code
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Java Foundations

Learn to read, reason about, and write Java — the language that runs the enterprise.

61 lessons Runs real code
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JavaScript Master

Learn modern JavaScript by writing and running real code — no fake output, no simulation.

58 lessons Runs real code
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Machine Learning from Scratch

Learn machine learning by building it — gradient descent, logistic regression, decision trees, and k-means implemented by hand and run in your browser, then the professional scikit-learn stack used correctly.

54 lessons Runs real code
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Python Masterclass

Go from zero to confident Python developer — by writing and running real code in every lesson.

52 lessons Runs real code
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SQL Essential

Query a real database in your browser — every answer checked against real results.

59 lessons Runs real code