Mainframe Z/Os AdministratorDCV Technologies • Bracknell, England, United Kingdom

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Mainframe Z/Os Administrator

DCV Technologies

Bracknell, England, United Kingdom

Bracknell, England, United Kingdom

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Our client, an award-winning Car Hire Rental company is looking for a Mainframe Z/Os Administrator 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 will oversee 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. 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

Bracknell, England, United Kingdom

Sprachkenntnisse

English

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