Modernize your legacy WCF services: Automated migration to ASP.NET Core Web API using AWS Transform custom

This article demonstrates using AWS Transform custom to automate migration of a .NET Framework WCF SOAP service to an ASP.NET Core Web API on .NET 10.

• AWS Transform custom is an agentic AI service for large-scale software modernization including API migrations, framework upgrades, and code refactoring
• Create custom transformation definitions in natural language describing WCF-to-Web-API conversion rules, routing, DTOs, and HTTP semantics
• AI agent analyzes codebase, generates step-by-step execution plan, transforms files incrementally with build verification after each step
• Sample migration converted 10 SOAP operations to REST endpoints across 5 controllers, replaced EF6 with EF Core, added async/await, and preserved assembly identity
• Transformation definitions are reusable across organizations; harden with correctness criteria for defect classes like query translation and status codes
• Post-transformation verification checks for legacy artifacts, filtering after materialization, sync-over-async patterns, and endpoint parity

AWS Transform custom enables automated, repeatable modernization of WCF services with AI-driven code generation and validation, reducing manual effort and ensuring correctness beyond compilation.