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# z/OS Mainframe Engineer

- **Company:** ICU IT Services
- **Location:** Utrecht, Netherlands (Remote available)
- **Experience:** Expert
- **Salary:** €4,500.0 - €6,000.0
- **Contract:** Permanent contract
- **Skills:** Customer Information Control System (CICS), IBM DB2, IBM Parallel Sysplex, Job Control Language (JCL), Rexx (Programming Language), IBM Websphere Application Server, Mainframes, IBM Resource Access Control Facility, Ansible, Virtual Storage Access Methods, Z/OS, Ibm Z/vm, Omegamon, Servicenow
- **Published:** May 14, 2026
- **Apply:** https://nl.indeed.com/viewjob?jk=52d05e316ee766a0

## About the Role

* Minimaal 5 jaar ervaring als systeem programmeur of mainframe engineer op z/OS.
 * Diepgaande kennis van z/OS internals (address spaces, dispatching, virtual storage, IPL-flow, parmlib-concatenations) en vloeiend in JCL en REXX.
 * Ervaring met SMP/E, change management (ITIL/ServiceNow) en het plannen van maintenance windows.
 * Sterke analytische skills en een security-mindset: je weet dat een RACF-profile met UACC(ALTER) geen feature is, maar een bug.
 * Goede beheersing van Nederlands en Engels; je documenteert helder en presenteert je oplossingen overtuigend.
 * Pluspunten: GDPS/HyperSwap, zCX, Ansible for z/OS, Zowe CLI, IBM-certificeringen (System Programmer, RACF, DB2).
 * HBO werk- en denkniveau;
 * Relevante werkervaring in een Enterprise-omgeving;
 * Je weet mensen mee te nemen in jouw oplossingen;
 * In Nederland werken.

## Description

* Beheer en doorontwikkeling van z/OS 2.5 / 3.1 binnen een Parallel Sysplex op IBM z15/z16, met meerdere LPAR's en Coupling Facility.
 * Installatie, upgrade en maintenance via SMP/E (PTF's, APAR's, RSU); opstellen van fallback- en rollbackplannen binnen change management.
 * Tunen van WLM, RMF, SMF en GRS om transactie-SLA's te halen; beheer van DFSMS, DFSMShsm, VSAM en catalog-structuren.
 * Troubleshooting op laag niveau: dumpanalyse met IPCS, traces via GTF/CTRACE, performance-onderzoek met RMF en Omegamon.
 * Schrijven en optimaliseren van JCL en REXX; automatisering met System Automation, Zowe en (op termijn) Ansible for z/OS.
 * Security & compliance: RACF-policies, pervasive encryption, AT-TLS, ICSF en sleutelbeheer; sparren met applicatieteams (CICS, DB2, MQ, IMS).
 * Meedraaien in een 24/7 stand-by rooster (~1 week per 6 weken), met heldere compensatie.


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