Learn how to build, test, and validate custom code transformation systems using agentic AI in this 56-minute conference talk from AWS re:Invent 2025. Discover practical approaches for defining effective transformation rules, implementing comprehensive testing strategies to refine AI agents, and establishing validation methods that ensure reliable code conversion processes. Explore actionable best practices for handling complex code conversions while maintaining transformation quality at scale, specifically designed for architects and developers working on application modernization projects. Gain insights into creating robust transformation agents that can effectively automate code migration and modernization tasks within enterprise environments.