Mainframe 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.

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  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

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  Install, configure, and support key subsystems
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  JES2/JES
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  TSO/E, ISP
• FUSS (Unix System Services
• )RACF (in coordination with security teams
• )Work closely with DB2, CICS, IMS, MQ, and Storage teams for integration and support

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  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)

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  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

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  Develop and maintain automation using tools such as
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  System REXX, CLIS
• wSupport job scheduling tools (e.g., CA7, Control-M where applicable)

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  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

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  Execute changes through ITIL-based processes (Service Now or equivalent)
• .Prepare implementation plans, backout procedures, and validation steps
• .Support weekend maintenance windows and IPL activities

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  Create and maintain technical documentation, including