Senior Systems Programmer - Legacy Systems
Hrimoveisararaquara
Job ID# 10TEK0852-031826 - Posted 03/18/2026 - Downey, CA Key Responsibilities We are seeking an experienced Senior Systems Programmer - Legacy Systems to support, maintain, and enhance enterprise z/OS mainframe environments. This role is responsible for both ongoing system maintenance and the development of operating system environments, ensuring optimal performance, security, and reliability. The ideal candidate will bring deep expertise in mainframe technologies, strong leadership experience, and the ability to manage complex system upgrades and integrations with minimal downtime. System Maintenance & Support Plan and execute system upgrades in alignment with company-established schedules Monitor and verify the health and performance of all z/OS systems Analyze issues reported by development teams and provide recommendations and resolutions Ensure compatibility between software applications and operating systems Perform timely hardware upgrades with minimal disruption to operations Apply patches and updates to security and system software regularly Collaborate with stakeholders to test applications following system upgrades Analyze system requirements, risks, and cost considerations Evaluate, select, and validate system software environments Install and configure compilers, assemblers, and system utilities Integrate hardware and software components across system environments Monitor, fine-tune, and optimize system performance Evaluate emerging technologies and assess their impact on the environment Ensure security and information assurance policies are implemented and maintained Required Skills: Strong expertise in IBM mainframe technologies, including: z/OS, IMS, DB2, ADABAS
SMP/E, JCL, IMS DB/DC, CICS
ACF2 security, VTAM, TCP/IP, NetView Control-M, CA Spool Natural/SuperNatural, EntireX IMS & DB2 BMC ToolsHMC, HOD, IODF, VTS
Proficiency in programming and scripting: Strong knowledge of system architecture, performance tuning, and capacity planning Excellent troubleshooting and analytical skills Ability to lead complex infrastructure initiatives and mentor junior staff IBM z16 and z17 hardware platformsCA ACF2 V17
Host On-Demand (HOD) V16.1 Experience Requirements Minimum 7 years of experience in z/OS systems programming At least 4 years in a lead or senior role managing complex mainframe environments Education: Bachelor’s degree in Information Technology, Computer Science, Engineering, or a related field Additional Information: This is a systems programming role (not a development role) - mainframe developer resumes will not be considered Candidate must have extensive hands-on experience with mainframe hardware and system software Initial three (3) weeks onsite required Ongoing onsite presence required for major system upgrades #J-18808-Ljbffr HrimoveisararaquaraVacancy posted 2 days ago
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