Step Functions Workflow: Route S3 Uploads to Lambda or Fargate

Overview

This skill deploys an event-driven workflow using AWS CLI. When a file is uploaded to an S3 bucket, EventBridge triggers a Step Functions state machine. The state machine checks the file size and routes processing to either a Lambda function (files ≤ 6 MB) or a Fargate task (files > 6 MB).

The architecture includes:

• An S3 bucket with EventBridge notifications enabled
• An EventBridge rule that triggers Step Functions on S3 object creation
• A Step Functions state machine with a Choice state for routing
• A Lambda function for processing small files
• An ECS Fargate task for processing large files
• A VPC with two subnets, internet gateway, and security group
• An ECR repository for the Fargate container image
• Scoped IAM roles for Lambda, Step Functions, and ECS tasks