Event-driven systems bring scalability and decoupling, but they also introduce challenges.
Common patterns we implemented:
- Event Sourcing: storing state changes as events
- CQRS: separating write and read models
- Outbox pattern: ensuring consistency between DB and event publishing
Pitfalls:
- Lack of traceability across async hops
- Event schema versioning issues
- Difficult debugging without a centralized log
Tip: Invest in an event registry and distributed tracing early.