Worked on the checkstyle/checkstyle repository to enhance code quality by addressing annotation placement enforcement. Focused on Java development and unit testing, the work involved removing the suppression for violationBetween in InputAnnotationLocationInterface, ensuring that annotation location checks are properly enforced. Updated the corresponding tests to align with stricter coding standards, which improved the reliability of code quality checks and reduced the likelihood of annotation misplacements passing through continuous integration. By concentrating on code quality and test coverage, the contribution strengthened the repository’s standards compliance and provided a more robust signal for annotation-related issues during automated code review processes.