Senior Systems Programmer - Legacy Systems z/OS
Listed on 2026-10-16
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IT/Tech
Systems Engineer, Systems Administrator
Job # 10
TEK
- Posted 02/11/2026 - Remote, Downey, CA
We are seeking a highly experienced Senior Mainframe Systems Programmer to support and enhance legacy z/OS environments. This role is responsible for the planning, implementation, maintenance, and optimization of enterprise mainframe operating systems and associated infrastructure.
The ideal candidate will bring deep expertise in IBM z/OS systems programming, mainframe architecture, performance tuning, and security integration. This is a systems programming role (not a development position).
- Plan and execute system upgrades in accordance with County standards
- Monitor system health and implement required changes
- Analyze issues reported by development teams and provide technical recommendations
- Design and maintain systems architecture
- Coordinate post-upgrade application testing with stakeholders
- Ensure compatibility between operating systems and software products
- Perform hardware upgrades with minimal downtime
- Evaluate emerging software technologies
- Ensure timely patching of security-related products
- Analyze system requirements, risks, and cost considerations
- Evaluate, select, install, and validate system software environments
- Install and maintain compilers, assemblers, and utilities
- Integrate hardware and software components across enterprise environments
- Monitor, tune, and optimize system performance
- Evaluate new systems engineering technologies and assess their impact
- Ensure information security and assurance principles are integrated into system environments
Extensive hands-on experience with IBM mainframe technologies, including:
- z/OS
- IMS (DB/DC)
- DB2
- ADABAS
- SMP/E
- JCL
- CICS
- ACF2
- Control-M
- VTAM
- TCP/IP
- Net View
- Natural / Super Natural
- EntireX
- CA Spool
- IMS & DB2 BMC Tools
- HMC / HOD / IODF
- VTS
- HCD
- z/OSMF
- IBM z16 and z17 hardware
- CA ACF2 V17
- HOD V16.1
Minimum 7 years of z/OS systems programming experience
At least 4 years in a lead or senior-level role
Extensive knowledge of mainframe hardware and system software environments
Education:Bachelor's degree in Information Technology, Engineering, or related field
(Additional qualifying experience may substitute for education on a year-for-year basis.)
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