Building Reliable Event-Driven Systems: Event Schemas, Versioning, Contract Testing and Events vs Commands (part-2)

Short summary

Part 2 of a series on reliable event-driven systems, focusing on designing event schemas that age well. Events should represent business concepts rather than leak producer implementation details, and teams should avoid serializing internal domain models directly. Dedicated event models keep contracts stable even as internal code evolves independently.

• •Design events for consumers, not producers—represent business facts, not internal structures
• •Avoid serializing JPA entities directly; use dedicated event model classes
• •Include enough business information in payloads to avoid forcing consumers into extra API calls

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