Clean & Hexagonal Architecture - it really works!
summary
Rebuilt an open source Labella sticker app in Kotlin + Spring Boot, applying Clean and Hexagonal Architecture with Event Storming to cut cognitive load and speed iteration; SVG templates become code, previews render to images, and the SVG renderer is replaceable so a single line swap moves from magic→inkscape and fixes missing features. Added a caching decorator, a QR-code decorator, and modular ports/adapters to allow selective mocks for tests, reduced wasted tries from roughly 30 wasted stickers, and shows the techniques work in practice.
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chapters (10)
- 0:00Introduction and motivation
- 7:32Clean Architecture overview
- 10:15SOLID principles in practice
- 16:14Clean Architecture benefits
- 17:43Hexagonal Architecture explained
- 20:13Layered architecture structure
- 24:26Testing and mockability
- 26:12Hexagonal vs clean architecture
- 28:27Summary and best practices
- 30:35Q&A session
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