W Concept Completes Modernization of 1.6 Million Lines of .NET 10 in 7 Weeks Using AWS Transform and Kiro

• Migrated a .NET Core 3.1 application of 1.6 million lines (1,613,895) to .NET 10 and Linux-based Amazon ECS within 7 weeks
• Shortened work hours with a hybrid strategy that used AWS Transform for .NET (free) for library conversion and Kiro to finalize UI projects
• Achieved license cost reduction and a 90% reduction in migration effort by transitioning from Windows Server-based EC2 to Linux containers
• Completed deployment while minimizing operational changes by reusing the existing Jenkins CI/CD pipeline

Pre-preparation and Architecture

• Separated COM+ modules, which are Windows-dependent, into APIs in advance to remove obstacles to Linux migration
• Configured Private NuGet Packages based on .NET Standard to ensure multi-architecture compatibility
• Switched file upload methods from the SMB protocol to Amazon S3 and CloudFront to block security and exception factors

Tool Utilization and Verification

• Input AWS Transform outputs into Kiro Context to perform UI project conversion and Dockerfile customization
• Used Kiro to create JMeter and Datadog performance test scenarios and to analyze runtime errors
• Introduced Playwright-based characterization tests to verify functional equivalence through Kiro's spec-based test generation feature