Mainframe ZOS System Programmer

Job Title: Mainframe ZOS System Programmer

Location: Phoenix, AZ

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