Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

vertical slice

Organizing code by feature, so everything for one feature sits together.

Vertical slice architecture groups code by feature or use case end to end rather than by technical layer.