How to build event-driven architecture in the cloud

· Category: Cloud Computing

Short answer

Event-driven architecture uses events to trigger and communicate between decoupled services.

Steps

  1. Identify event producers (IoT devices, user actions, database changes).
  2. Choose a message broker (SNS/SQS, EventBridge, Pub/Sub, Azure Event Grid).
  3. Define event schemas and versioning.
  4. Build consumers (Lambda, Cloud Functions, containerized workers).
  5. Add dead-letter queues for failed event processing.

Tips

  • Use idempotent consumers to handle duplicate events safely.
  • Schema registries enforce consistency across services.
  • Event sourcing stores state as a sequence of events.

Common issues

  • Event ordering: some brokers guarantee FIFO only in specific configurations.
  • Observability is harder; distributed tracing is essential.