For CS graduates
From algorithms to architecture
You understand Big O and recursion. Your first production codebase has 200 files, a CI pipeline, and zero comments. Bridge that gap with exercises that teach production patterns.
Your CS knowledge transfers
OOP, type systems, and algorithmic thinking all apply. The Dart course builds on what you already know.
Learn what school skipped
MVVM architecture, dependency injection, state management. The patterns that make codebases maintainable at scale.
S.O.L.I.D. in practice
Design principles with interactive exercises. Apply each principle to real code and see how it changes the architecture.
Built by production engineers
Google Developer Experts with 8+ years shipping real software.
Write code from lesson one
Every lesson is an exercise you solve in your browser. Real code, real tests, real feedback.
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
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.
Production-ready starts here
Write your first exercise in under a minute.