V3 DDD Architecture

Identify the distinct responsibilities inside the god object, such as task management, session handling, and health monitoring, then extract each into its own domain with entities, value objects, services, and repositories. Wire them together through domain events rather than direct calls.

A microkernel architecture uses a small core kernel that loads domains and plugins at runtime through a defined interface. Each plugin declares its name, version, and dependencies, then registers services with the kernel during initialization.

Domain events let one context publish facts like TaskCompletedEvent without knowing its consumers. Handlers in other contexts subscribe via an event bus, updating metrics or session state independently, which keeps domains isolated and testable.

Yes, domain entities and services contain no external dependencies, so they can be tested with pure unit tests using mocks. London School TDD verifies behavior like event emission and state transitions without databases or network calls.

DDD adds structural overhead—entities, value objects, repositories, and event buses—that may not pay off for small or short-lived projects. It is best suited to complex domains where bounded context isolation and long-term maintainability matter.