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Event-driven architecture replaces synchronous coupling with three quieter kinds: schema coupling, ordering coupling, and observability coupling. Each one is invisible in a demo and surfaces as a production incident.
At-least-once delivery is a guarantee, not a bug. Most webhook receivers in production are missing idempotency, dead-letter queues, or reconciliation. Here is the full checklist.
Pub/sub decouples services at the network layer while recoupling them at the schema and semantic layers. Three coupling modes explain why this happens and what prevents each one.
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