Modernizing legacy systems: migrate or rewrite?
Organizations that use mainframes often face the challenge of future-proofing legacy applications. Two commonly used strategies are rehosting and refactoring. Choosing the right approach can save costs, reduce risks, and simplify integration with modern technologies such as cloud, microservices, and APIs.
What is Refactoring?
Refactoring involves rewriting or redesigning the application code to take advantage of modern architectures and frameworks.
Benefits of Refactoring:
- Optimization for performance, maintainability, and safety
- Ability to integrate cloud-native functions and microservices
- Improved compatibility with modern tooling and CI/CD pipelines
Disadvantages:
- Higher initial costs and effort
- Requires in-depth knowledge of legacy code and modern techniques
When do you choose which strategy?
- Rehosting is suitable when the focus is on speed, minimizing risk, and maintaining current functionality.
- Refactoring is the better choice if the application needs to be integrated intensively with new systems, optimized for the cloud, or requires modern maintenance.
Organizations often combine both strategies: first rehosting to migrate quickly, then gradually refactoring for optimization and integration with modern technologies.
RedCarpet provides experienced mainframe developers
At RedCarpet, we provide experienced COBOLand z/OS developers who can support both rehosting projects and refactoring. Our developers help migrate legacy applications securely and make them future-proof, enabling organizations to benefit from both reliability and innovation.
Would you like to know which approach best suits your mainframe applications? Feel free to contact us and discover how our experts can strengthen your team.
Modernizing legacy systems: migrate or rewrite?
Organizations that use mainframes often face the challenge of future-proofing legacy applications. Two commonly used strategies are rehosting and refactoring. Choosing the right approach can save costs, reduce risks, and simplify integration with modern technologies such as cloud, microservices, and APIs.
What is Refactoring?
Refactoring involves rewriting or redesigning the application code to take advantage of modern architectures and frameworks.
Benefits of Refactoring:
- Optimization for performance, maintainability, and safety
- Ability to integrate cloud-native functions and microservices
- Improved compatibility with modern tooling and CI/CD pipelines
Disadvantages:
- Higher initial costs and effort
- Requires in-depth knowledge of legacy code and modern techniques
When do you choose which strategy?
- Rehosting is suitable when the focus is on speed, minimizing risk, and maintaining current functionality.
- Refactoring is the better choice if the application needs to be integrated intensively with new systems, optimized for the cloud, or requires modern maintenance.
Organizations often combine both strategies: first rehosting to migrate quickly, then gradually refactoring for optimization and integration with modern technologies.
RedCarpet provides experienced mainframe developers
At RedCarpet, we provide experienced COBOLand z/OS developers who can support both rehosting projects and refactoring. Our developers help migrate legacy applications securely and make them future-proof, enabling organizations to benefit from both reliability and innovation.
Would you like to know which approach best suits your mainframe applications? Feel free to contact us and discover how our experts can strengthen your team.