About this role

Odyssey Information Services is seeking an experienced Mainframe Systems Programmer / zOS Operations Engineer to support a large enterprise IBM z/OS environment. This role is responsible for daily system operations, IPL support, HMC administration, change windows, emergency response, and software upgrades.

Responsibilities:

Perform daily health checks of LPARs, started tasks, VTAM nodes, and JES spool utilization
Monitor system resources (CPU, JNUM, JQES, BUFX) and resolve performance issues
Support batch job management, priority adjustments, initiator changes, and task recycling
Lead and support Sunday IPL / change window activities, including PORs, PARMLIB updates, and Coupling Facility maintenance
Create and maintain IPL run sheets / SOP documentation
Manage HMC operations, LPAR profiles, capacity changes, STP, SOFTCAP, and Capacity on Demand
Support MQ, DB2, CICS, zOS Connect, and other critical started task recycling outside IPL windows
Execute emergency dumps, system restores, failovers, and outage recovery procedures
Support z/OS software upgrades and hardware refresh activities

Requirements:

Strong hands-on experience with IBM z/OS mainframe administration
Expertise with LPARs, IPLs, PORs, HMC, JES, VTAM, DB2, MQ, and CICS
Experience supporting enterprise change windows and production incident response
Strong troubleshooting and system recovery background