For team leads
Grow juniors into engineers.
Your juniors can write features. They can't architect systems. Interactive exercises in SOLID, DRY, and production patterns build the engineering maturity that code reviews alone won't teach.
Design principles through practice
SOLID and DRY aren't abstract when you apply them to real code. Each exercise makes developers refactor, restructure, and reason about architecture.
Faster than mentoring alone
Structured exercises cover what takes months of code review feedback to teach. Your time goes to advanced guidance, not basics.
Measurable progress
Every exercise runs tests. You see what your juniors have completed and where they got stuck. Progress is visible, not assumed.
SOLID + DRY + Flutter architecture
The courses that bridge the gap from feature dev to systems thinker.
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.
Your juniors' growth path is ready
Interactive architecture training with team plans.