Mainframe z/OS System Programmer

Responsibilities

• 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.
• 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.
• 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).
• 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.
• 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).
• Support system-level security configurations aligned with RACF policies.
• Affirm compliance with audit, regulatory, and enterprise security standards.
• Afford vulnerability remediation and patching activities.
• Execute changes through ITIL-based processes (ServiceNow or equivalent).
• Prepare implementation plans, backout procedures, and validation steps.
• Support weekend maintenance windows and IPL activities.
• Create and maintain technical documentation, including:
• System configurations
• Standard Operating Procedures (SOPs)

Qualifications

Required:

• Bachelor's degree in Computer Science, Information Systems, or related field.
• Minimum 5 years of hands-on experience with IBM z/OS operating systems.
• Experience with JES2/JES3, TSO/E, ISPF, USS, and RACF.
• Strong knowledge of system administration, performance tuning, and capacity management.
• Experience with automation tools such as System REXX, CLIST, and SA z/OS.
• Ability to diagnose and troubleshoot complex system issues.
• Experience with change and release management processes.

Desired:

• Experience with DB2, CICS, IMS, MQ, and Storage systems.
• Knowledge of ITIL and ServiceNow.
• Experience with CA7 and Control-M.
• Experience with z-series hardware and upgrades.