Mainframe z/OS Administrator (2 Positions)

Role Summary

The Mainframe z/OS Administrator is responsible for the installation, configuration, maintenance, and performance management of IBM Mainframe environments running z/OS. This role ensures high availability, security, compliance, and operational stability of mission‑critical enterprise applications and infrastructure.

Key Responsibilities

🖥️ z/OS System Administration

· Install, configure, and maintain IBM z/OS operating systems and related system software.

· Manage IPL activities, system upgrades, patches, and preventive maintenance.

· Monitor system health, performance, and capacity to ensure optimal operation.

⚙️ System Performance & Availability

· Perform performance tuning using RMF, SMF, SDSF, and related tools.

· Analyze CPU, memory, DASD, and workload performance to proactively address bottlenecks.

· Ensure high availability and disaster recovery readiness.

🔐 Security & Compliance

· Implement and maintain security controls using RACF (or ACF2/Top Secret as applicable).

· Manage user access, roles, permissions, and auditing.

· Support internal and external audits and ensure compliance with organizational and regulatory standards.

📦 Storage & Dataset Management

· Manage DASD, catalogs, datasets, VTOC, and space allocation.

· Perform dataset cleanup, reorganization, and storage optimization activities.

· Coordinate with storage teams for capacity planning and performance improvements.

🔄 Change, Incident & Problem Management

· Participate in change management, including risk analysis and implementation planning.

· Troubleshoot and resolve system incidents, abends, and outages.

· Provide root cause analysis and permanent fixes for recurring issues.

🧩 Middleware & Subsystem Support

· Support and integrate key subsystems such as CICS, DB2, IMS, JES2/JES3.

· Coordinate closely with application, database, and infrastructure teams during deployments and issues.

📑 Documentation & Knowledge Management

· Maintain system documentation, procedures, and runbooks.

· Provide operational support documentation and knowledge transfer to support teams.

Required Skills & Experience

✅ Technical Skills

· Strong hands‑on experience with IBM z/OS administration.

· In‑depth knowledge of JES2/JES3, SDSF, SMF, RMF, and system utilities.

· Working knowledge of CICS, DB2, IMS, and batch environments.

· Experience with RACF security administration.

· Familiarity with ISPF, JCL, and system scripting.

✅ Experience

· Typically 12–14+ years of experience in Mainframe z/OS environments (role‑dependent).

· Experience supporting large‑scale, mission‑critical production systems.

· Exposure to 24×7 operations, on‑call rotations, and major incident handling.