Production Event-Driven Architectures Are Built on Guarantees

The quality of an event-driven architecture isn't measured by how many events it processes, but by the guarantees it maintains as failures occur and traffic grows.

Reliability is about maintaining correctness under failure.

Durability
Delivery semantics
Ordering
Idempotency
Retries
DLQs
Replayability
Recovery
Resilience

Scalability is about maintaining high performance under growth.

Partitioning
Parallelism
Horizontal scaling
Backpressure
Flow control
Bottleneck isolation
Independent consumer scaling
Throughput optimization

Design for failure.

Design for growth.

Design for production.