Worked on stabilizing Java migration and mutation frameworks across two repositories, focusing on reliability and maintainability. In moderneinc/rewrite-recipe-starter, addressed a critical bug by correcting MethodMatcher syntax for ArrayList initialization in Java, which resolved unit test failures and improved the stability of collection mutation recipes. In bmuschko/rewrite-migrate-java, implemented Jakarta EE migration recipe pinning by aligning EE9 and EE10 dependencies with their umbrella releases, reducing compilation and runtime errors during migrations. Leveraged skills in code analysis, dependency management, and refactoring, using Java and YAML to ensure safer migration paths and more reliable mutation logic for downstream projects.