Salary: £42,000 - 82,000 per year Requirements: In-depth knowledge and hands-on experience with z/OS operating system installation, configuration, and maintenance. Proven experience with major z/OS upgrades. Extensive experience with the installation and support of various ISV products from vendors such as Broadcom/CA, BMC, IBM, and Rocket Software. Hands-on experience with IBM Z mainframe hardware including CPCs, LPAR configuration, HMC/SE operation, IOCDS/IODF management, FICON channels, OSA, Coupling Facility structures, and hardware upgrades or migration. Understanding of automation tools such as OPS/MVS, System Automation, Automation Point, and integration of alerts/monitoring across enterprise operations (desirable). Familiarity with ZEKE Scheduler to support operations teams and diagnose JES/workload issues (desirable). Exposure to large enterprises or regulated environments (desirable). Responsibilities: Plan, prepare, and execute z/OS operating system upgrades. Apply IBM PTFs and APARs to maintain system integrity and resolve reported issues. Monitor z/OS system health, performance, and resource utilization using tools like RMF, SMF, TMON, and SAS. Install, configure, upgrade, and maintain a wide range of ISV products (e.g., Broadcom/CA, BMC, IBM, Rocket Software, etc.). Collaborate with vendors for problem resolution, licensing, and technical support. Ensure compatibility and integration of ISV products with the z/OS environment. Manage and maintain critical system datasets (e.g., SYSRES, Page datasets, SMF datasets). Provide expert-level support for mainframe incidents, including problem determination, diagnosis, and resolution in a timely manner. Analyze system performance data to identify bottlenecks and recommend improvements. Tune various z/OS components, WLM (Workload Manager), and ISV products to optimize resource utilization and application performance. Support DR planning, setup, IPL testing, replication technologies (e.g., GDPS), and DR event execution. Analyze system logs, sysout, dumps, and diagnostic data for complex issues. Participate in on-call rotation for 24/7 support of critical systems. Technologies: Hardware IBM Support SAS More: We are a committed team located in Bracknell, focused on maintaining and optimizing our z/OS operating environment. This contract role requires an office-based presence where you will be instrumental in ensuring high availability and performance of our mainframe systems. Our collaborative environment encourages teamwork and continuous improvement, offering opportunities to work with leading technology vendors. last updated 7 week of 2026