Legacy System Modernization: Refactoring vs Re-platforming vs Total Re-architecting

The 3 Primary Modernization Strategies

1. Refactoring (Code Optimization): Improving internal code quality, decoupling business logic, and adding automated tests without altering external system behaviors.
2. Re-platforming (Lift and Modernize): Moving workloads to managed cloud databases (AWS RDS, Aurora) and container runtimes (ECS) with minimal core code modifications.
3. Re-architecting (Cloud-Native Transformation): Completely re-engineering the application into modern event-driven microservices, serverless components, and decoupled frontend architectures.