Mainframe ZOS System 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. 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.ResponsibilitiesSystem 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 SupportInstall, configure, and support key subsystems:JES2/JES3TSO/E, ISPFUSS (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 ManagementAnalyze 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 & TroubleshootingDiagnose 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 & SchedulingDevelop and maintain automation using tools such as:System REXX, CLISTSA z/OS, NetViewSupport job scheduling tools (e.g., CA7, Control-M where applicable).Security & ComplianceSupport 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 ManagementExecute changes through ITIL-based processes (ServiceNow or equivalent).Prepare implementation plans, backout procedures, and validation steps.Support weekend maintenance windows and IPL activities.DocumentationCreate and maintain technical documentation, including:System configurationsStandard Operating Procedures (SOPs)Disaster Recovery plans