Mainframe Operator

• IBM App Mainframe Support & Batching
• Australian Citizen willing to attain baseline clearance
• Sydney, Brisbane, Melbourne, Canberra & Adelaide offices

Green Light is partnering up with a leading company to engage IBM App Mainframe Support Consultant to maintain and support critical enterprise batch processing systems and DB2 database environments. The role requires strong expertise in managing z/OS mainframe infrastructure, JCL scripting, DB2 on z/OS, and enterprise-level performance tuning. The ideal candidate will ensure the ongoing stability, security, and performance of our mainframe operations supporting Java-based batch applications.

This role does require an active AGSVA baseline clearance at a minimum. Australian Citizens willing to attain to take a baseline clearance is acceptable.

Responsibilities

• Ensure stability and high availability of the z/OS mainframe environment hosting mission-critical workloads.
• Monitor system resources, IPL operations, and apply system maintenance, patches, and upgrades as required.
• Participate in incident management, RCA, and preventative maintenance planning.

DB2 on z/OS Support

• Provide advanced troubleshooting and support for DB2 databases on z/OS in collaboration with DB2 DBAs.
• Resolve SQL and system-level DB2 errors, support schema changes, and assist in performance optimization.
• Support database change deployments in test and production environments.

JCL and Batch Job Management

• Maintain and troubleshoot JCL scripts for enterprise batch processes.
• Analyze job execution, resolve scheduling conflicts and job failures, and optimize execution flow.
• Review and resolve SYSOUT and abend logs to ensure batch job integrity.

Data Set Management

• Allocate, manage, backup, and restore VSAM and non-VSAM data sets required by batch jobs.
• Ensure data integrity, retention compliance, and efficient storage utilization.

Mainframe Security Administration

• Administer security rules and access controls using RACF, ACF2, or Top Secret.
• Implement least-privilege access principles, conduct access audits, and manage user profiles.
• z/OS Performance Tuning & Optimization
• Monitor system performance metrics (SMF, RMF) to identify bottlenecks or resource contention.
• Recommend and implement tuning strategies to optimize CPU usage, I/O throughput, and batch job turnaround times.

Requirements

• Bachelor's degree in Computer Science, Information Systems, or equivalent experience.
• 5+ years of hands-on experience with IBM z/OS mainframe systems administration or support.
• Deep knowledge of JCL, TSO/ISPF, SDSF, and job scheduling tools (e.g., Control-M, CA-7).
• Proficiency with DB2 on z/OS and understanding of Java batch processing in mainframe environments.
• Strong skills in RACF, ACF2, or Top Secret for mainframe security.
• Experience in SMF data analysis and system-level tuning.
• Solid understanding of mainframe storage concepts and disaster recovery practices.

Apply Now! For more information, contact John on 0413 004 696 or email ***email_hidden***

We are an Australian onshore services company that provides technology capability across ANZ and Asia. Our services range from day-to-day operational activities, through project delivery, to more strategic and transformational programs. At Green Light, we are committed to creating a diverse and inclusive workplace where everyone feels valued and respected. We are proud to be an equal opportunity employer and do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

We encourage applications from all backgrounds and communities, and we are dedicated to providing a fair and accessible recruitment process for all candidates. During the recruitment process, if you require any accommodations or modifications please reach out to [email protected] or call +61 9247 3799.