Role/Job title Mainframe Z/Os Administrator Work Location Bracknell Role type - Permanent/Fixed Term/ Contracting Contracting Mode of working Hybrid /office based Office Based If Hybrid, how many days are required in office? NA Number of positions 1 Unit CBG TTH Americas - ITIS Duration of assignment 06 Months Any other working conditions - travel/on call/shifts On Call To be published on job boards from below onwards The Role This role is responsible for implementing, maintaining and optimizing z/OS Operating environment and involves managing system configuration, upgrades, applying maintenance (PTFs/RSUs), monitoring system performance and ensuring high availability. The engineer oversees hardware components such as CPCs, LPARs, DASD, tape systems, HMC/SE, and IOCP/IODF configurations. Your 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.) Have good understanding and experience on Hardware Configuration Definitions / IOCP and HMC Management and WLM management. 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. Your Profile Essential skills/knowledge/experience: 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 Desirable skills/knowledge/experience: Understanding of automation tools such as OPS/MVS, System Automation, Automation Point, and integration of alerts/monitoring across enterprise operations Familiarity with ZEKE Scheduler to support operations teams and diagnose JES/workload issues. Exposure to large enterprises or regulated environments.