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

Requirements

• Active Top Secret Security Clearance
• DoD IAT Level II certification required
• Minimum of 8 years of experience in mainframe systems programming, administration, or support
• Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related field, or equivalent combination of experience and training
• Strong hands-on experience with IBM z/OS, CICS Transaction Server, and IBM MQ
• Experience with software installation, upgrades, patching, maintenance, and migration activities in enterprise mainframe environments
• Experience troubleshooting system abends, dumps, traces, and performance issues in production environments
• Working knowledge of SMP/E, JCL, TSO/ISPF, REXX, CLIST, and related IBM mainframe utilities