How Experian Saved 300 Engineering Days Using AWS Agentic AI for .NET Modernization

Legacy applications are a tax on engineering capacity. At Experian’s Data Office in the UK, that tax had become difficult to ignore: seven internal applications running on older .NET Frameworks needed migration to modern cloud-native infrastructure, but manually refactoring those applications would have consumed months of engineering time that was already committed to innovation projects.

The complexity was substantial. The applications relied on custom libraries with deep integration dependencies on systems like ServiceNow, required refactoring rather than lift-and-shift treatment, and depended on manual deployment processes that had accumulated technical debt over years. Pulling experienced engineers off higher-value work to run a migration felt like the wrong trade-off. The team needed a way to accelerate the mechanical work of code transformation without sacrificing quality or security.

AWS Transform, the company’s agentic AI service for .NET modernization, addressed this directly. The tool analyzed the existing codebase, identified dependencies, planned migration waves, and automated code transformation from older .NET Framework versions to .NET 8.0 — all without manual intervention for the bulk of the work. Amazon Q Developer Security Scan ran alongside the transformation to catch vulnerabilities. The parallel job execution capability in AWS Transform’s web interface allowed Experian to modernize multiple applications simultaneously.

The results were measurable at both the project and code level. Across seven applications, developer effort dropped approximately 40%. The total transformation covered 687,600 lines of code. Approximately 300 engineering days were saved — time that went directly back into higher-impact initiatives. Performance improved on the modernized .NET 8.0 platform, and deployment automation became consistent across all seven applications.

Experian also migrated to Amazon EKS for container orchestration, providing flexible scaling and managed security controls. The .NET modernization program is now serving as a model for how the Experian Data Office approaches future technical debt reduction at scale.