Mainframe z/OS System Programmer

Mainframe z/OS System Programmer

Phoenix, AZ

Onsite-Hybrid

The 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 & Maintenance

• Install, 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 Support

• Install, configure, and support key subsystems:
  • JES2/JES3
  • TSO/E, ISPF
  • USS (Unix System Services)
  • RACF (in coordination with security teams)
  • Work closely with DB2, CICS, IMS, MQ, and Storage teams for integration and support