This post walks through building a choreographed, event-driven order fulfilment system on AWS using EventBridge, Lambda, and SQS. It covers how events propagate between subdomains, the trade-offs between choreography and orchestration, and how to handle idempotency, observability, and event schema design. Inspired by a real-world example in Monolith to Microservices, the post also includes infrastructure-as-code examples using both CloudFormation and Terraform.
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