Developed the ZOS User and Group Management Module (zos_user) for the ansible-collections/ibm_zos_core repository, enabling comprehensive RACF-based user lifecycle management on z/OS systems. The work focused on delivering robust CRUD and purge operations with extensive support for OMVS, TSO, and granular access controls. Leveraging Ansible and Python, the module was engineered with thorough validation, error handling, and resilience to missing fields. Comprehensive documentation and functional tests were included to ensure real-world reliability, covering end-to-end workflows and edge cases. The implementation emphasized idempotent behavior, improved argument specification handling, and maintained high standards for code quality and test hygiene.