Z/OS Systems Hardware Specialist | Mainframe Support & Upgrades Role Overview We are looking for an experienced z/OS Systems Hardware Specialist to support and maintain Mainframe Processor operations within a multi-LPAR, multi-site Sysplex environment. The role involves hardware maintenance, system upgrades, troubleshooting, and performance optimization to ensure high availability and efficiency. Key Responsibilities Mainframe Hardware Support & Maintenance: Oversee the UK Mainframe Processor estate in a multi-LPAR Sysplex environment. Troubleshoot and resolve day-to-day hardware incidents and system failures. Processor & Microcode Upgrades: Lead upgrades of IBM Mainframe Processors to the latest generations ( z14, z15, z16 ). Upgrade Microcode levels on Mainframe Processors, Coupling Facilities, HMCs, and TKEs. System Configuration & Optimization: Build and activate IODF/IOCDS configurations for storage and system updates. Update PR/SM definitions via HMC. Collaboration & Risk Management: Work closely with cross-functional teams to ensure system efficiency and reliability. Maintain compliance with risk management and regulatory processes. Out-of-Hours Support: Provide after-hours support for critical hardware implementations and upgrades. Required Skills & Experience Extensive experience in Mainframe hardware support and configuration. Strong knowledge of IBM z/OS systems and tools, including: HMC, HCD, TSO/ISPF, SDSF, JCL, CHPID Mapping Tool, JES2. Hands-on experience with IBMz processor generations ( z14, z15, z16 ). Sysplex and Coupling Facility expertise. Excellent troubleshooting and problem-solving skills. Effective communication skills, with the ability to explain complex technical concepts to a broad audience. Preferred Skills (Not Mandatory but Advantageous) Automation, GDPS, Rexx, and CLIST scripting. OSA-ICC definition and configuration. Basic understanding of DWDM technology. Familiarity with Disk/Tape infrastructure. Work Environment & Flexibility Location: Sheffield or Wakefield. Hybrid Work Model: Work-from-home flexibility with on-site presence when required. Why Join? Work on critical IBM Mainframe upgrades in a high-performance IT environment. Lead next-generation mainframe technology implementations. Collaborate in a structured, technology-driven organization. If you are a Mainframe Hardware Specialist with strong z/OS expertise, wed love to hear from you