Mainframe Admin

Experience: 7 years
Domain Context: High-availability enterprise supporting manufacturing inventory logistics/distribution order processing and partner interfaces
Shift/On-call: On-call support for P1/P2 incidents and planned releases (as required)

Role Summary

Provide L2/L3 production support and deliver enhancements for mission-critical applications running on IBM z/VSE in a 24x7 operations environment.
Lead P1/P2 incident bridges restore service quickly drive high-quality RCA and implement preventive fixes that reduce repeat outages and protect shipping/plant cutoffs.
Support connectivity and interfaces (VSEn/VSE Navigator/TCP-IP file transfers partner integrations) critical to supply chain execution.

Key Responsibilities

Own end-to-end production support: incident triage service requests problem management and resolution within SLAs.
Lead P1/P2 bridges: rapid triage clear executive-ready updates action/owner tracking and post-incident follow-through.
Perform RCA (5-Whys/fault tree as appropriate) document corrective actions and execute preventive improvements (monitoring automation runbooks).
Deliver enhancements: requirements clarification impact analysis design build unit/system testing release and hypercare.
Manage change/release activities: implementation & backout plans approvals deployment execution and post-deploy verification.
Support batch/online stability aligned to operational timelines (batch windows cutoffs reconciliations interface replays).
Coordinate across application infrastructure network security and vendor teams; ensure audit-ready documentation and evidence.

Required Skills (z/VSE / Mainframe)

Strong hands-on IBM z/VSE production support (L2/L3).
VSE JCL: job setup dependency handling reruns/restarts checkpoint/restart patterns.
VSE/POWER: spool/queue/output management and troubleshooting.
Batch operations: abend analysis recovery steps controlled data fixes/reprocessing.
Online support: CICS on z/VSE (region/transaction troubleshooting and recovery).
Data/files: VSAM concepts (KSDS/ESDS/RRDS) space/extend issues integrity/reconciliation troubleshooting.
VSEn / VSE Navigator (as used): operational visibility monitoring and administration.
Connectivity/interfaces: TCP/IP troubleshooting FTP/SFTP flows file-based integrations rerun/replay controls and reconciliation.
ITIL discipline: incident/problem/change management and strong RCA writing.

Development / Enhancement Skills (Required or Strongly Preferred)

COBOL (or equivalent) for debugging minor-to-medium enhancements and production fixes.
Strong testing and release support in controlled environments (segregation of duties approvals evidence).