Learning Reference

Concept Atlas

Interactive artifacts for understanding DDD and design patterns — built to explore, not just read.

Aggregates & Bounded Contexts
Payments domain split into Billing, Identity, and Notifications — explore aggregates, value objects, domain events, and ACLs with PHP examples.
Bounded Context Designer
Drag-and-drop canvas to sketch bounded contexts and draw relationships — ACL, Shared Kernel, Customer/Supplier, and more.
Ubiquitous Language Builder
Living glossary per bounded context with automatic conflict detection — same term, different meaning across contexts.
GoF Pattern Cheat Sheet
All 23 Gang of Four patterns — filterable by category, searchable, with Before/After PHP examples and a payments-domain lens.