Legacy Mainframe / Z-Systems Specialist Advancio - 2.9 Downey, CA Job Details Full-time 1 day ago Qualifications Data Integration (Data management) Automation DB2 IT system monitoring Database server management CICS Assembly language Mainframe Customer support ticket management COBOL Help desk systems Mainframe development Production monitoring IP networking ISPF Control-M System performance monitoring Full Job Description Job Information Date Opened 09/25/2026 Job Type Full time Industry Technology City Downey State/Province California Country United States Zip/Postal Code 90240 Job Description 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
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
