Salary: £54,000 - 60,000 per year Requirements: Strong hands-on experience with z/OS installation, configuration and support Proven experience delivering major z/OS upgrades Deep knowledge of LPAR, HMC, IOCP, IODF, FICON, OSA, Coupling Facility Experience supporting ISV tools (Broadcom, BMC, Rocket) Performance tuning and capacity management expertise GDPS exposure (desirable) Automation tools such as OPS/MVS or System Automation (desirable) Experience within large enterprise or regulated environments (desirable) Responsibilities: Plan and execute z/OS upgrades, maintenance, PTFs and APARs Install, configure and support ISV products (Broadcom/CA, BMC, Rocket Software) Manage IBM Z hardware including CPC, LPAR configuration, HMC/SE, IOCP/IODF Monitor and tune performance using RMF, SMF, TMON, SAS, WLM Support GDPS, IPL testing and disaster recovery execution Provide incident resolution and participate in on-call support Technologies: Hardware IBM Support SAS More: We are a large enterprise seeking a Senior Mainframe z/OS Administrator / Systems Programmer to join our team, focused on supporting critical IBM Z infrastructure. This office-based, hands-on role offers opportunities to engage in z/OS system administration, upgrades, performance tuning, and disaster recovery in a 24/7 production environment. We value individuals who thrive in complex, mission-critical settings and are committed to delivering high-quality results. last updated 7 week of 2026