Mainframe z/OS System Programmer

Phoenix, AZOnsite-HybridThe Mainframe z/OS System Programmer is responsible for the installation, customization, maintenance, and optimization of IBM z/OS operating systems and associated system software. This role ensures the stability, performance, security, and availability of mission-critical mainframe environments, supporting large-scale enterprise applications.System Administration & MaintenanceInstall, configure, and maintain IBM z/OS operating systems.Perform system upgrades, migrations (e.g., z/OS version upgrades), and apply maintenance (PTFs, APARs, RSUs).Manage IPL processes, system initialization, and configuration (PARMLIB, PROCLIB, SYS1 datasets).Monitor system health and performance using tools such as RMF, SMF, SDSF.Subsystem SupportInstall, configure, and support key subsystems:JES2/JES3TSO/E, ISPFUSS (Unix System Services)RACF (in coordination with security teams)Work closely with DB2, CICS, IMS, MQ, and Storage teams for integration and support