Legacy Mainframe / Z-Systems Specialist

Role Summary

Operates, administers, programs, or migrates data on IBM Z/OS mainframe systems and adjacent legacy technologies (CICS, IMS, DB2, ADABAS). Covers the full spectrum from production job operations to senior systems programming/DBA work to legacy data conversion for modernization projects. This talent pool is shrinking industry-wide — treat as a standing sourcing priority, not a reactive one.

Core Responsibilities

• Start, stop, and monitor mainframe system tasks and subsystems (transaction processing, database systems, OS)
  

• Perform orderly shutdown/startup ('restart operations') of production workloads
  

• Plan, install, configure, and upgrade Z/OS systems and core system software products
  

• Administer and tune hierarchical (IMS), relational (DB2), and file-based (ADABAS) databases
  

• Develop, debug, and maintain mainframe application code (COBOL, NATURAL, Assembler, REXX)
  

• Support data mapping, crosswalk analysis, and validation during legacy-to-modern data conversion
  

• Manage production job scheduling and troubleshooting (Control-M, JCL, Endevor)
  

• Maintain detailed documentation and ticketing records for audits and knowledge continuity
  

• Facilitate knowledge transfer/training to build succession depth on an aging skill set
  

Requirements

Skills Required

• Z/OS, CICS, IMS, DB2, ADABAS, ACF2, ENTIREX, SMP/E
  

• COBOL, NATURAL/SuperNatural, Assembler, REXX
  

• JCL, Control-M, CA Spool, TSO/ISPF, Endevor
  

• VTAM, TCP/IP, NetView, Tivoli
  

• Data conversion/ETL between legacy and relational/modern platforms
  

• Ticketing and production-control tooling (Cherwell or similar)
  

Experience Required

• 5–7 years of experience in mainframe operations, systems programming, or application programming (role-dependent)
  

• For senior/lead roles: 3–5 years in a lead capacity
  

• 2–3 years working with legacy and relational data technologies (DB2, FOCUS, Oracle, SQL Server) for conversion-focused roles
  

• 1–2 years of automation of system monitoring/maintenance procedures for operator-tier roles
  

Education / Training

• Bachelor's degree in an IT-related field or equivalent mainframe-operations experience
  

• Additional qualifying experience may substitute for education on a year-for-year basis