Mainframe Administrator

Mainframe z/OS Administrator - Contract - Office Based

We are seeking a Senior Mainframe z/OS Administrator / Systems Programmer to join a large enterprise environment supporting critical IBM Z infrastructure. This is a hands‑on role focused on z/OS system administration, upgrades, performance tuning and disaster recovery within a 24/7 production estate.

• 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

• 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
• Automation tools such as OPS/MVS or System Automation
• Experience with in large enterprise or regulated environments

This role is ideal for a Senior z/OS Systems Programmer / Mainframe Infrastructure Engineer who thrives in complex, mission‑critical environments and owns delivery from upgrade planning through to DR execution.

Apply now to discuss full details and day rate