Transforming Legacy Systems: A Public Sector Migration from CA Gen to Java

The Client

A government-owned, non-profit organisation responsible for administering loans and grants to students across the UK. Supporting over 2 million new and returning students annually, the organisation manages a customer base of 9.7 million and a loan book valued at £260.8 billion.

The Challenge

• Legacy CA Gen systems were limiting agility and scalability.
• Tight delivery timelines driven by policy and legislative changes.
• The client was considering a full system rewrite due to complexity and technical debt.
• The system included 150,000 objects, 20 external APIs, and over 100 procedure steps—equivalent to 40,000 lines of code.
• A modern, maintainable solution was needed without compromising business logic.

The Solution

TXP applied its REGENERATE methodology, using automated tooling to migrate the CA Gen source models to a structured Java environment. This significantly reduced manual effort while preserving the integrity and performance of the original application.

Working closely with the client’s enterprise architects, TXP delivered a flexible, scalable baseline application aligned with current policy and regulatory requirements. We also supported automated testing and integrated CI/CD pipelines to enable agile delivery and future enhancements.

The Benefits

• Seamless migration to a secure, cloud-based Java platform built on industry-standard tooling.
• Elimination of legacy technology dependencies, enabling full decommissioning of CA Gen.
• Reduced risk and predictable costs, even with the scale and complexity of the migration.
• Adoption of a DevOps-ready delivery model using CI/CD and agile practices.
• A proven, repeatable approach that can be applied to similar system transformations.
• Enhanced service capability and readiness for future digital initiatives.