Mainframe ZOS System Programmer
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.
* This role requires employees to live in or around the Phoenix, AZ area. You will be responsible to be onsite 3 days a week. We will consider candidates who are willing to relocate to the area.
Responsibilities:
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.
Performance & Capacity Management:
- Analyze system performance metrics and implement tuning improvements.
- Support capacity planning and resource optimization (CPU, memory, I/O).
- Evaluate hardware upgrades (e.g., CPU/MIPS growth, z-series enhancements).
Problem Management & Troubleshooting:
- Diagnose and resolve system-related issues, including system abends and failures.
- Perform root cause analysis for outages and major incidents.
- Work with IBM and vendors on problem determination and fixes.
Automation & Scheduling:
- Develop and maintain automation using tools such as:
- System REXX, CLIST
- SA z/OS, NetView
- Support job scheduling tools (e.g., CA7, Control-M where applicable).
Security & Compliance:
- Support system-level security configurations aligned with RACF policies.
- Ensure compliance with audit, regulatory, and enterprise security standards.
- Assist in vulnerability remediation and patching activities.
Change & Release Management:
- Execute changes through ITIL-based processes (ServiceNow or equivalent).
- Prepare implementation plans, backout procedures, and validation steps.
- Support weekend maintenance windows and IPL activities.
Documentation:
- Create and maintain technical documentation, including:
- System configurations
- Standard Operating Procedures (SOPs)
- Disaster Recovery plans
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