Mainframe ZOS System Programmer

Role:Mainframe ZOS System Programmer

Contract 

Remote 

w2 

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.

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:

o JES2/JES3

o TSO/E, ISPF

o USS (Unix System Services)

o 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:

o System REXX, CLIST

o 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:

o System configurations

o Standard Operating Procedures (SOPs)

o Disaster Recovery plans