Christopher Mahoney modernized the PhotonVision/photonvision repository by migrating its codebase and build system to Java 17, focusing on long-term maintainability and compatibility. He refactored legacy switch statements to use modern switch expressions, improving code readability and aligning with current Java best practices. Throughout the process, Christopher ensured that all changes were validated against existing CI pipelines, preserving build stability and backward compatibility. His work involved Java development, build system configuration, and code refactoring, laying a solid foundation for future feature development. This migration reduced future maintenance costs and enabled the project to leverage new language features for faster delivery.