Mainframe Automation Engineer (CA OPS/MVS, REXX, z/OS) Contract | 6 Months | £550–£600 per day | Office Based | On-Call Required We are seeking an experienced Mainframe Automation Engineer with strong expertise in CA OPS/MVS and REXX programming to support a large-scale enterprise IBM z/OS environment. This is a hands-on role focused on designing, developing and maintaining mainframe automation rules, OPS/REXX scripts, and operational workflows to improve system stability, availability and performance. Key Responsibilities: \* Develop and maintain CA OPS/MVS automation rules \* Write and enhance REXX and OPS/REXX scripts \* Implement automation for JES2, WTOR handling, IPL events \* Manage message automation across DB2, CICS, MQ, VTAM \* Monitor system events, alerts and console messages \* Support disaster recovery automation and production support \* Perform health checks, tuning and MSF configuration Essential Skills: \* Strong experience with CA OPS/MVS \* Proven REXX programming expertise \* Deep understanding of IBM z/OS \* Experience with JES2, system consoles, WTOR, IPL \* Background in enterprise mainframe production support Experience with System Automation for z/OS, OPSVIEW, OPSLOG or MSF is advantageous. This role suits a senior-level Mainframe Automation Specialist who has worked in complex, regulated, 24/7 environments and can take ownership of automation stability within mission-critical systems. Apply now if you are currently hands-on with OPS/MVS and REXX in a live production z/OS environment