Mainframe CICS System Administrator

A well-established enterprise organization is seeking a Mainframe CICS System Administrator to join its infrastructure operations team in the Phoenix, Arizona area. This is a full-time hybrid position requiring onsite attendance three days per week. The environment includes IBM CICS Transaction Server, z/OS platforms, enterprise monitoring tools, and large-scale transaction processing systems that support critical business functions.

This opportunity is ideal for an experienced mainframe professional who enjoys solving complex technical issues, improving system performance, and maintaining highly available environments. The organization is investing in modernization initiatives while continuing to support critical legacy infrastructure, providing exposure to both operational excellence and long-term transformation efforts. The successful candidate will work alongside experienced infrastructure professionals and contribute directly to platform reliability and performance. Required Skills & Experience 5+ years of experience supporting IBM mainframe environments

Hands-on CICS Transaction Server (CICS TS) administration experience

Experience applying PTFs and supporting software maintenance activities

Knowledge of production, testing, and disaster recovery environments

Experience monitoring system health and resource utilization

Strong troubleshooting and root-cause analysis abilities

Understanding of transaction processing systems

Experience managing system configurations and startup parameters

Desired Skills & Experience OMEGAMON experience

MainView experience

TMON experience

Performance tuning and optimization expertise

Capacity planning experience

Disaster recovery testing and support

Experience working within large enterprise environments

Exposure to mainframe modernization initiatives

What You Will Be Doing Install, configure, and support CICS Transaction Server environments

Apply maintenance, upgrades, and software updates

Administer production, testing, and disaster recovery regions

Monitor platform performance and system availability

Analyze CPU consumption, storage utilization, and transaction metrics

Perform tuning activities to improve overall system efficiency

Troubleshoot infrastructure and platform issues

Partner with engineering, operations, and support teams

Tech Breakdown 60% CICS Administration & Maintenance

25% Performance Monitoring & Optimization

15% Infrastructure Support & Collaboration

Daily Responsibilities 75% Hands-on Technical Administration

10% Documentation, Planning & Process Improvement

15% Team Collaboration & Project Work