Worked on the PicnicSupermarket/error-prone-support repository to deliver a new collection of Refaster rules aimed at simplifying AssertJ stream operations such as filter, anyMatch, and noneMatch. Focused on improving code readability and reducing boilerplate, the approach involved code analysis and systematic Java refactoring. Comprehensive tests were added to validate the new rules and ensure they prevent regressions, supporting ongoing code quality efforts. The work leveraged Java and testing skills to align with error-prone-assisted development workflows, ultimately enhancing developer velocity. All changes were linked to a specific commit for traceability, reflecting a methodical and quality-driven engineering process.