For QA engineers

Write the code, not the bug report.

You understand how software breaks. That makes you better at building software that doesn't. Learn Dart and Flutter with an exercise-first approach that feels like the test-driven thinking you already do.

Your QA mindset is a superpower

You think about edge cases, error states, and failure modes. That critical thinking makes you write better code than developers who never tested.

Test-driven learning

Every exercise runs automated tests against your code. Write a solution, see if it passes. The feedback loop matches how you already think about correctness.

SOLID foundations from day one

Learn design principles that produce testable, maintainable code. The SOLID and DRY courses teach you the architecture patterns that make QA easier.

Dart + Flutter + SOLID + DRY

From testing software to building it.

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.

Join over 5,000 learners

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.

Flutter Course

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

S.O.L.I.D. Course

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

D.R.Y. Course

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

System Design Course

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

Interactive courses

Every lesson is an exercise with instant feedback.

Move from QA to dev with confidence

Interactive courses built on the testing mindset you already have.