For notebook developers going production

Production code. Structured thinking.

Cell-by-cell code got you the insight. Now learn the architecture that makes it maintainable, testable, and shippable.

SOLID principles teach you to organize code into modules that do one thing well. The architecture notebooks never require.

DRY principles show you when to abstract and when to keep things explicit. The judgment call that separates scripts from software.

Every lesson is an exercise with real tests. You apply each principle to code and see whether it passes. No ambiguity.

SOLID + DRY + Dart + Flutter

From notebook cells to production modules.

Write code from lesson one

Every lesson is an exercise you solve in your browser. Real code, real tests, real feedback.

Write a greeting function

main.ts

function greet(name: string) {

return `Hello, ${name}!`

}

Each concept builds on the last. You always know what to learn next.

Quizzes, fill-in-the-blank, matching, and code keep every lesson engaging.

Submit your answer and see test results in milliseconds.

Learn by doing

Solve exercises in your browser from the first lesson.

Pick a course and solve your first exercise.

An interactive Dart course where you code, test, and build apps directly in your browser.

An interactive Flutter course where you code, test, and build apps directly in your browser.

Learn the principles of how software should be structured, so you can guide AI to build better systems.

Learn to identify and eliminate code duplication, making your codebase cleaner and easier to maintain.

Learn how APIs, databases, caching, and load balancing fit together to build scalable systems.

Interactive courses

Every lesson is an exercise with instant feedback.

Interactive courses that teach production architecture through exercises.