Event-Driven Architecture Diagram Template

Diagram an event-driven architecture — producers, the event bus, consumers, and an event store.

What you get

Producers and consumers decoupled by an event bus
Fan-out from the bus to multiple specialized consumers
Optional event store for replay and audit

What this template is for

An event-driven architecture diagram shows how services communicate through events rather than direct calls. This template lays out the three core layers: producers that emit domain events when something happens, an event bus (Kafka, RabbitMQ, NATS) that distributes them, and consumers that react asynchronously — sending notifications, updating analytics, refreshing search indexes. An event store can persist events for replay and audit. Use it to design an event-driven system, document an existing one, or explain why producers and consumers are decoupled by the bus.

When to use this template

Design a new event-driven system before picking a broker.
Explain to a stakeholder why producers don't call consumers directly.
Document the events flowing through your system for a design review.
Show where the event bus persists events vs streams them live.
Plan a migration from a request/response monolith to event-driven services.
Trace a failure: did the producer emit, the broker route, or the consumer process correctly?

How to use it

1Draw the producer layer at the top — services that emit events when state changes.
2Add the event bus in the middle (Kafka, RabbitMQ, NATS, etc.).
3Add an event store beside the bus for replay and audit.
4Draw the consumer layer at the bottom — services that react to events.
5Connect each producer to the bus and the bus to each consumer.
6Label which events flow on which topics so subscriptions are clear.