For production engineers

Design for production. Not for theory.

Your team needs someone who can design a new service, propose a caching strategy, or explain why the current architecture is bottlenecking. Be that person.

Start the System Design Course

Real production scenarios

Design notification systems, payment flows, and data pipelines. Exercises modeled on problems production teams actually solve.

Capacity planning and scaling

Estimate throughput, calculate storage needs, plan for traffic spikes. Exercises that build the math intuition architects use daily.

Lead design reviews

Walk into architecture meetings with the vocabulary and reasoning to propose solutions, spot risks, and evaluate trade-offs.

System Design + SOLID + DRY

Architecture skills for your current role.

Try a Lesson

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}!`

}

Structured progression

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

Multiple exercise types

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

Instant feedback

Submit your answer and see test results in milliseconds.

Learn by doing

Solve exercises in your browser from the first lesson.

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Flutter Zero to Mastery

Explore our courses

Pick a course and solve your first exercise.

Dart Course

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

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Flutter Course

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

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S.O.L.I.D. Course

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

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D.R.Y. Course

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

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System Design Course

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

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Interactive courses

Every lesson is an exercise with instant feedback.

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Your next architecture decision starts here.

Interactive exercises for the systems you build at work.

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