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Senior Mainframe CICS Systems Programmer responsible for installing, configuring, tuning, and maintaining CICS on z/OS. Duties include performance monitoring and tuning, troubleshooting production issues, developer support, integrating CICS with subsystems (DB2, MQ), implementing security and disaster recovery, and automating tasks via scripting (REXX) and CI/CD pipelines. Role requires mentoring, leading complex incident resolution, and participating in after-hours/on-call support to ensure availability of mission-critical applications.