Mainframe Security Administrator

Role Summary We are seeking a senior Mainframe Security Administrator to secure and administer our IBM z/OS environment using RACF. You will own the RACF database, manage digital certificates, support auditing and compliance, and ensure security is configured correctly across a Parallel Sysplex environment. Key Responsibilities Administer RACF users, groups, and resource profiles, and maintain resource access lists Manage the RACF database: backup databases, database housekeeping, and monitoring of usable database space.

Run and interpret RACF utilities for database initialization, split/merge/extend, unload, and verification. Plan and execute database changes, such as switching to a backup database, with controls to prevent corruption from incorrect database sharing. Provide 2nd/3rd-level support for z/OS security incidents and access issues. Work with systems programmers, application teams, and security/GRC teams. Create and maintain procedures, runbooks, and documentation.

Mandatory Skills IBM z/OS: deep, hands-on knowledge of the operating system Parallel Sysplex: working knowledge of Parallel Sysplex concepts. RACF: strong knowledge of RACF concepts and administration, including RACF database management. RACF digital certificates: hands-on experience with RACDCERT. RACF auditing: hands-on experience. 8+ years of relevant mainframe security administration experience.