Senior Systems Administrator (Mainframe ZOS)

Talent21 Management and Shared Services Pvt Ltd; Hyderabad, Chennai, Bengaluru; On-site; INR 3,000,000 - 6,000,000; Full time

Job summary

Talent21 Management and Shared Services Pvt Ltd is hiring a Senior z/OS Systems Administrator to lead L3 support for core mainframe infrastructure. You will drive complex OS upgrades, JES3/spool management, and disaster recovery in a mission-critical environment across IBM Z platforms.

The role requires 6–10+ years of z/OS experience, deep SMP/E, JCL, RACF/ACF2, and scripting skills. Expect night shifts in IST and collaboration with cross-functional teams to ensure continuous availability.

Qualifications

• Bachelor’s degree in Computer Science, IT, Computer Engineering, or equivalent practical experience.
• 6–10+ years of hands-on IBM z/OS System Administration and L3 Production Engineering.
• Experience supporting high-volume 24x7 mainframe operations in financial/government sectors.
• Mastery of z/OS architecture, including z/OS 3.1 and readiness for z/OS 3.2.
• Advanced SMP/E and JES3 experience; strong MVS console, PARMLIB/PROCLIB, and WLM knowledge.
• CSM administration for multi-site replication; disaster recovery and storage redundancy.
• Scripting with REXX/CLIST/JCL; RACF/ACF2 security administration.
• Shift: 5:30 PM–2:30 AM IST with weekends/offs during migrations or DR exercises.

Responsibilities

• Serve as highest-level internal escalation for OS incidents and complex systems engineering.
• Lead major OS upgrades and migrations (e.g., z/OS 3.1 to 3.2) and DR planning.
• Oversee JES3 spool/batch subsystems, console alerting, and CDS/CF management.
• Ensure non-stop system availability and SLA compliance across IBM Z environments.
• Collaborate with architecture, storage, automation, and app infra teams for modernization.
• Manage backups, recovery testing, and cross-site replication in CSM environments.

Skills

z/OS Administration

L3 Production Engineering

JES3

REXX

CLIST

JCL

RACF/ACF2 security

Education

Bachelor’s degree in CS/IT/CE

Tools

CA View

Flasher

DFSMSdss

JES3plex

z/OS 3.1/3.2

Job description

Job description :

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.