event-driven-architect

To design an event-driven architecture, you structure services around domain events and an adaptable event bus, enabling loose coupling and scalable integrations. This allows microservices to react independently to state changes.

Event sourcing captures state changes as a sequence of immutable events for auditability and replayability. You need it when systems require strict historical tracking or the ability to reconstruct past states.

Implementing CQRS separates command and query models, optimizing writes and reads. Read-model projections are updated via events to keep query models in sync and support fast, scalable reads.

Yes, pub/sub domain events enable loose coupling and real-time reactions across microservices, data pipelines, and real-time analytics. The architecture enforces type-safe events to ensure reliable data flow.

Avoid event-driven architecture when tight synchronous coupling is required or when systems do not need scalable, reactive behavior. It adds complexity through event storage and projections, which may be unnecessary for simple applications.