Worked on the CAUSW_backend repository to advance role-based access control for club and circle management, focusing on delegation workflows that enhance administrative flexibility and permission integrity. Developed and delivered a feature enabling robust role delegation, including re-enabling circle leader delegation, validating circle IDs and member status, and relaxing requirements to reduce friction for administrators. Addressed a bug to ensure correct removal of the COMMON role during multi-role delegation, preserving accurate user permissions. Maintained code hygiene by refining delegation-related annotations, supporting long-term maintainability. Utilized Java and Spring Boot for backend development, emphasizing stability, clarity, and future extensibility in the codebase.