Two major announcements for Lambdas in ReInvent 2020 solves your usecase.
you can easily trigger a Lambda function from S3 Upload, Here is a tutorial
Older approach: Triggering an ECS task from Cloudwatch Event Rule, Here is a tutorial
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…