Legacy and Mainframe Code Conversion using GitHub Copilot

Capgemini’s Mainframe Code Conversion Journey enables organizations to modernize legacy mainframe applications by leveraging GitHub Copilot for:

1. Extracting business rules from mainframe code ~40% faster than traditional approaches.
2. Generating UI (ReactJS) and API (Spring Boot) code, even for developers with no prior knowledge, reducing development effort by 70%.
3. Automating unit test case creation, achieving 90% automated test coverage for APIs.
4. Reducing SME dependency by 50%, as GenAI clarifies routine business rules with minimal manual intervention.
5. Enhancing DevOps automation through GitHub Copilot-generated OpenAPI specs, build scripts, and deployment pipelines.

This solution drives increased adoption of Microsoft products such as:

• Azure DevOps & GitHub – Integrated CI/CD for mainframe-to-cloud transformation.

• Microsoft Excel – Exporting legacy system insights for analysis.

• VS Code – Optimized GenAI-driven development with Copilot integration.

Project Deliverables:

• Automated Code Extraction from COBOL, JCL, Copybooks using GitHub Copilot.

• GenAI-driven UI & API Code Generation with ReactJS (UI) and Spring Boot (API).

• Automated Unit Test Case Generation (~90% test coverage).

• Code Refactoring & Consolidation for efficient modernization.

• DevOps Automation via OpenAPI specs, build scripts, and containerization.

• Legacy System Analysis & Documentation using AI-assisted prompts.

Duration:

Ongoing implementation with the ability to scale based on enterprise modernization needs.

Technologies Involved:

• GitHub Copilot

• Microsoft Azure DevOps

• ReactJS & Spring Boot