During March 2025, this developer focused on improving the reliability of large-scale code transformations in the INRIA/spoon repository by addressing a critical bug in compilation unit type renaming. Using Java and leveraging skills in code analysis and refactoring, they implemented a fix that ensures all type references within a compilation unit remain synchronized and that the main type is correctly identified after renaming. This technical approach prevents build and name resolution errors that previously occurred post-refactor, reducing the risk of failures. Their work enhanced refactor safety and increased developer confidence in maintaining and evolving complex Java codebases within Spoon.