Senior Systems Administrator (Mainframe ZOS)

Job Title: Mainframe z/OS Admin (Senior Systems Administrator L3 Support)
Experience: 6-10+ Years
Employment Type: Full-Time
Location: Bangalore, Chennai, Hyderabad

Position Description

We are seeking an experienced Senior z/OS Systems Administrator (L3 Support) to join our Core Mainframe Infrastructure Services team. In this senior, escalated technical role, you will act as the highest level of internal technical escalation for operating system incidents, complex systems engineering, system migrations, and operational resilience across mission-critical enterprise IBM Z environments.

You will lead complex problem resolution, drive major operating system upgrades — including migrations from z/OS 3.1 to z/OS 3.2 — oversee JES3 spool/batch subsystems, manage advanced MVS console alerting, and ensure robust disaster recovery and storage redundancy utilizing CSM (Copy Services Manager). This position works closely with architecture, storage, automation, and application infrastructure teams to guarantee non-stop system availability, strict SLA compliance, and continuous modernization of the mainframe landscape.

Required Qualifications

• Bachelor’s degree in Computer Science, Information Technology, Computer Engineering, or equivalent practical experience.
• Minimum of 6–10+ years of dedicated, hands-on experience in IBM z/OS System Administration and L3 Production Engineering.
• Demonstrated background supporting high-volume, 24x7 mission-critical financial, enterprise, or government mainframe operations.
• Comprehensive mastery of z/OS architecture and administration, including z/OS 3.1 and release readiness for z/OS 3.2.
• Advanced SMP/E experience (RECEIVE, APPLY, ACCEPT, RESTORE, SMPPTS, and CSI management).
• Hands-on expertise in JES3 environments (JES3plex, spool management, initialization decks, Global/Local operations).
• Strong MVS console architecture knowledge: console operations, routing codes, command authority, message flood automation, and alert triage.
• Deep knowledge of PARMLIB/PROCLIB management, dynamic I/O configuration (HCD), and Workload Manager (WLM).
• Experience with IPCS dump reading, AMASPZAP, IDCAMS, DUMP/RESTORE (DFSMSdss), IEBCOPY, and DSNUTILS.
• Copy Services Manager (CSM) administration for multi-site replication, HyperSwap monitoring, and storage redundancy.
• Knowledge of Parallel Sysplex concepts: Sysplex Timers (STP), Coupling Facility (CF) structures, and CDS management.
• Experience with report and log archiving suites, specifically CA View and Flasher.
• Strong scripting and automation skills: REXX, CLIST, and JCL mastery.
• Security administration experience: RACF or ACF2 (profiles, certificates, class administration, and audit remediation).
• Willingness to work the 5:30 PM–2:30 AM IST shift, including scheduled weekend and off-hours coverage during planned OS migrations, maintenance windows, and disaster recovery exercises.

Preferred Skills

• IBM Certified System Administrator – z/OS.
• Experience with JES3 to JES2 migration strategies and assessment planning.
• Familiarity with database/middleware subsystems: IBM Db2 for z/OS, IMS, CICS, and IBM MQ.
• Exposure to Mainframe Modernization: z/OSMF workflows, Ansible for z/OS, and Git-based source management.