Serverless Workflow Decomposition: When a Step Function Becomes a Monolith

There is a point in many serverless platforms where a Step Functions workflow that once felt elegant starts to feel like a mini application platform of its own. I have seen this happen in teams that are doing many things correctly: they standardized orchestration, they improved visibility, and they moved fragile glue logic out of Lambdas. Then six months later, the workflow has 100+ states, a maze of Choice branches, deeply nested payload transformations, and a deployment blast radius that makes