For CTOs scaling past the MVP
Make your codebase scale-ready.
Your MVP shipped. Users arrived. Now every shortcut is slowing you down. Learn the architecture patterns that let your codebase grow with your company.
SOLID principles in practice
Each principle taught through interactive exercises. Apply them to real code, see the impact on maintainability.
Stop rewriting, start extending
DRY course teaches you to structure code so new features add files, not modify existing ones.
Team plans available
Get your whole engineering team on the same architectural patterns. Shared vocabulary, shared standards.
SOLID + DRY + Flutter Architecture
From scrappy MVP to production system.
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.
Grow without rewriting.
Interactive courses that teach scalable architecture through real exercises.