Why it matters

Event-driven is modern microservices default. Understanding shapes decoupled systems.

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The architecture

Event bus: Kafka, Pub/Sub, EventBridge.

Producers publish events.

Consumers subscribe.

Event-driven flowProducerpublishes eventsEvent busKafka/Pub-SubConsumerssubscribe + processEvent schema evolution is critical — use schema registry
Event-driven pattern.
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How it works end to end

Event schema: use schema registry (Confluent, Google Schema Registry).

Idempotency: consumers must handle duplicates.

Ordering: within partition (Kafka) or via keys.

Event sourcing: events are truth; state derived.