Job Ttile : Mainframe z/OS System Programmer
Location: Phoenix, AZ
Work Mode: Onsite (Hybrid)

Job Description

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.

Location & Onsite Requirement

This role requires employees to live in or around the Phoenix, AZ area, and to be onsite 3 days a week. Candidates willing to relocate to the area will be considered.

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