AWS Transform custom is an AI-powered service that automates the migration of Excel VBA applications to Python. It addresses three core challenges: handling large codebases that exceed AI context windows through intelligent chunking, converting legacy VBA idioms to modern Python patterns (OOP, cross-platform libraries, proper encapsulation), and validating functional equivalence via automated test generation. The six-step workflow covers preparing the VBA source, creating a transformation definition through an interactive session, executing the transformation module-by-module in dependency order, validating with automated and manual tests, iterating on issues, and publishing the transformation to a registry for team-wide reuse. The system learns from each correction, improving quality across subsequent migrations. Transformed applications are cloud-ready and can be deployed via Docker/Kubernetes, AWS Lambda, or as standalone executables.
