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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior z/OS Systems Administrator - **Company:** Apetan Consulting - **Location:** United States (Remote available) - **Experience:** Expert - **Contract:** Temporary contract - **Skills:** Unix, Software Documentation, Databases, Disaster Recovery, IBM Parallel Sysplex, Monitoring of Systems, Job Control Language (JCL), IBM Mainframe, Rexx (Programming Language), IBM System Z, Job Entry Subsystem 2/3, Mainframes, Proprietary Software, IBM Resource Access Control Facility, Systems Architecture, System Software, TCP/IP, Z/OS, Diagnostic Tools, Tso/ispf - **Published:** August 22, 2026 - **Apply:** https://www.dice.com/job-detail/c437b0ec-a9a7-47c3-a99d-04858ada3c80 ## About the Role We are seeking an experienced Senior z/OS Systems Administrator to support and maintain a large-scale IBM mainframe environment. The ideal candidate will be a senior-level z/OS professional with deep hands-on expertise in SMP/E, REXX scripting, and z/OSMF, along with strong knowledge of z/OS systems administration, maintenance, upgrades, troubleshooting, and automation., * 10+ years of hands-on SMP/E experience in enterprise IBM z/OS environments. * 10+ years of hands-on REXX scripting experience, including development of automation for systems administration and operational tasks. * Strong hands-on experience with IBM z/OSMF (z/OS Management Facility). * Extensive experience administering and supporting IBM z/OS in large enterprise environments. * Strong knowledge of z/OS system architecture, configuration, maintenance, and troubleshooting. * Experience installing and maintaining IBM and third-party mainframe software. * Extensive experience applying PTFs, APARs, maintenance packages, and software upgrades using SMP/E. * Strong understanding of SMP/E CSI structures, zones, SYSMOD processing, HOLDDATA, RECEIVE, APPLY, ACCEPT, and RESTORE processes. * Strong knowledge of JCL, TSO/ISPF, UNIX System Services (USS), and z/OS utilities. * Ability to diagnose complex system problems using z/OS logs, dumps, system messages, and diagnostic tools. * Strong understanding of mainframe change-management and production-control processes. * Excellent analytical, troubleshooting, documentation, and communication skills. * Ability to work independently and take ownership of complex technical issues. Preferred Skills Experience with several of the following would be highly desirable: * JES2 * RACF * TCP/IP * UNIX System Services (USS) * HMC * IBM System z / IBM Z hardware * Parallel Sysplex * Coupling Facility * WLM * RMF / SMF * System Automation * SDSF * DFSMS * Disaster Recovery / Business Continuity * Mainframe monitoring and performance-management tools * Automation using REXX, JCL, CLISTs, and other scripting technologies ## Description * Install, configure, maintain, and support IBM z/OS operating systems and related system software. * Perform z/OS upgrades, maintenance, system modifications, and lifecycle management. * Provide advanced administration and troubleshooting of z/OS environments. * Use SMP/E (System Modification Program/Extended) extensively for installation, maintenance, upgrades, PTFs, APARs, HOLDDATA processing, and management of IBM and third-party software. * Analyze SMP/E environments, zones, CSI datasets, SYSMODs, and maintenance requirements. * Develop and maintain REXX scripts to automate z/OS administration, monitoring, reporting, maintenance, and operational processes. * Identify manual processes that can be improved through REXX-based automation. * Administer and support IBM z/OS Management Facility (z/OSMF). * Configure and maintain z/OSMF services, workflows, plugins, and system management functions. * Utilize z/OSMF for system management, configuration, monitoring, and automation. * Perform system problem determination, root-cause analysis, and resolution of complex z/OS issues. * Monitor system performance, availability, capacity, and overall system health. * Work with operations, application, storage, network, security, and database teams to resolve mainframe infrastructure issues. * Participate in system upgrades, migrations, disaster recovery testing, and infrastructure modernization initiatives. * Maintain system documentation, operating procedures, configuration standards, and technical runbooks. * Provide technical leadership and mentoring to other mainframe systems administrators. * Participate in production support and on-call activities as required. ## Related Videos - [".Net is too slow" was not an option](https://www.wearedevelopers.com/videos/100176-net-is-too-slow-was-not-an-option) - [An Applied Introduction to eBPF with Go](https://www.wearedevelopers.com/videos/1075-an-applied-introduction-to-ebpf-with-go) - [WeAreDevelopers LIVE - Node and Package Security](https://www.wearedevelopers.com/videos/2138-wearedevelopers-live-node-and-package-security) - [Turning Container security up to 11 with Capabilities](https://www.wearedevelopers.com/videos/718-turning-container-security-up-to-11-with-capabilities) - [Building with IBM Bob](https://www.wearedevelopers.com/videos/100275-building-with-ibm-bob) - [The Time Paradox: Building Timezone-Safe Python/Django Applications](https://www.wearedevelopers.com/videos/1915-the-time-paradox-building-timezone-safe-python-django-applications) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [93 Java Interview Questions You Should Prepare For](https://www.wearedevelopers.com/magazine/14-93-java-interview-questions-you-should-prepare-for) - [Software Developer Salary in Switzerland [2023]](https://www.wearedevelopers.com/magazine/215-software-developer-salary-in-switzerland-2023) - [Résumé-Driven Development: How IT trends affect the job market for software developers](https://www.wearedevelopers.com/magazine/59-resume-driven-development-how-it-trends-affect-the-job-market-for-software-developers) - [Data Analyst Salary in Switzerland](https://www.wearedevelopers.com/magazine/276-data-analyst-salary-in-switzerland)