Senior Mainframe Systems Programmer (IBM z/OS, CICS, MQ)
Delaware Nation Industries · TELECOMMUTE · Posted Jul 1, 2026
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We are seeking an experienced Senior Mainframe Systems Programmer to support and maintain IBM z/OS environments, with a strong focus on CICS Transaction Server and IBM MQ. This role is responsible for system administration, software installation and upgrades, troubleshooting, performance tuning, security compliance, disaster recovery support, and technical documentation in a secure, highly regulated enterprise environment.
The ideal candidate has deep hands-on experience with IBM mainframe technologies, middleware administration, change and incident management, and supporting mission-critical systems with high availability and operational stability.
Key Responsibilities
Administer, install, configure, upgrade, and maintain IBM z/OS mainframe environments, including CICS Transaction Server, IBM MQ, and related software products
Perform software installations, migrations, upgrades, patching, and implementation activities across multiple mainframe environments
Troubleshoot and resolve system abends, outages, and performance issues using logs, traces, dumps, and monitoring tools
Manage IBM MQ environments, including queue managers, queues, channels, backup processing, and web services administration
Monitor and tune system and middleware performance to ensure availability, reliability, and operational efficiency
Support secure and compliant system operations in accordance with cybersecurity and enterprise security requirements
Develop and execute implementation plans, test plans, recovery plans, and back-out procedures for software and hardware changes
Coordinate change management, incident management, CAB activities, and cross-functional implementation efforts using approved operational processes and tools
Create and maintain technical documentation, standard operating procedures, implementation guides, root cause analysis reports, and status updates
Utilize SMP/E, JCL, TSO/ISPF, REXX, CLIST, COBOL, and related IBM utilities to support administration, automation, and system operations
Support backup, recovery, and disaster recovery planning, testing, and execution
Provide technical guidance, mentoring, training, and customer support to project teams, junior staff, and stakeholders
Collaborate with infrastructure, cybersecurity, application, and operations teams to ensure stable and secure mainframe services