Patterns & Best Practices in Event-Driven Systems — Kogan.com Dev Blog

Event-driven architecture enables decoupled, scalable systems through five core patterns: event notification (lightweight signals), event-carried state transfer (self-contained payloads), event sourcing (immutable change logs), choreography (decentralized workflows), and orchestration (centralized coordination). Essential practices include implementing idempotency to handle duplicate events, using durable message streams for replay capability, versioning events explicitly, managing schemas through registries, naming events after business domain concepts, and tracking requests with correlation IDs for distributed debugging and observability.