Developer Builds Event-Driven Order Processing System Using AWS and Terraform

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A developer has published a detailed guide on building a production-style, event-driven order processing system using multiple AWS services and Terraform for infrastructure management. The architecture uses API Gateway to accept incoming orders, which are stored in DynamoDB and queued via Amazon SQS for asynchronous processing by a separate Lambda function. Orders move through three lifecycle states — PENDING, PROCESSING, and COMPLETED — without the API needing to wait for processing to finish. Failed messages are automatically retried, and those exceeding a maximum receive count are routed to a Dead-Letter Queue to prevent data loss. The entire setup is defined as Infrastructure as Code using Terraform, with CloudWatch handling logging and EventBridge firing an OrderCompleted event upon successful processing.

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