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Advancio, Inc

Legacy Mainframe / Z-Systems Specialist

Posted One Month Ago
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In-Office
Downey, CA, USA
Senior level
In-Office
Downey, CA, USA
Senior level
Operates, administers, programs, and modernizes IBM Z/OS mainframe environments. Responsibilities include system startup and shutdown, subsystem monitoring, software installation and upgrades, database administration and tuning, legacy application development, production job scheduling, troubleshooting, data conversion, documentation, and knowledge transfer. The role requires expertise across z/OS, CICS, IMS, DB2, ADABAS, COBOL, JCL, and related mainframe technologies.
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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



RequirementsSkills 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



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