Senior z/OS Systems Programmer - Mainframe Modernisation

GL Global

South Yorkshire

On-site

GBP 60,000 - 90,000

Full time

5 days ago
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Job summary

GL Global is seeking an experienced IBM z/OS Mainframe professional to install, configure, and maintain z/OS system software and core subsystems, including JES, SMP/E, and TSO/ISPF.

You will lead upgrades, patching, and performance tuning, investigate complex issues, support platform migrations, and ensure security and compliance while collaborating with infrastructure and engineering teams in the UK.

Qualifications

  • Extensive experience with IBM z/OS Mainframe environments.
  • Strong knowledge of JES, SMP/E, and TSO/ISPF.
  • Solid JCL experience and Mainframe automation scripting (REXX, CLIST).
  • Proven ability to install, configure, upgrade, and maintain Mainframe system software and utilities.
  • Experience with third‑party Mainframe tools (monitoring, storage, scheduling, performance management).
  • Proactive approach to troubleshooting, platform reliability and continuous improvement.

Responsibilities

  • Install, configure, and maintain z/OS system software and core Mainframe subsystems.
  • Lead and support system upgrades, patching, maintenance, and performance optimisation.
  • Investigate and resolve complex Mainframe system issues.
  • Contribute to platform migrations, integrations, and wider modernisation projects.
  • Ensure systems meet security, compliance, and regulatory requirements.
  • Collaborate with infrastructure, engineering, and application teams to deliver robust, reliable solutions.

Skills

IBM z/OS
Mainframe subsystems
JCL
REXX/CLIST
Upgrades & maintenance
Security & compliance

Job description

The Role
  • Install, configure, and maintain z/OS system software and core Mainframe subsystems.
  • Lead and support system upgrades, patching, maintenance, and performance optimisation.
  • Investigate and resolve complex Mainframe system issues.
  • Contribute to platform migrations, integrations, and wider modernisation projects.
  • Ensure systems meet security, compliance, and regulatory requirements.
  • Collaborate with infrastructure, engineering, and application teams to deliver robust, reliable solutions.
Experience
  • Extensive experience working with IBM z/OS Mainframe environments.
  • Strong knowledge of core z/OS components and subsystems, including JES, SMP/E, and TSO/ISPF.
  • Solid JCL experience, alongside Mainframe automation and scripting tools such as REXX, CLIST, or equivalent.
  • Proven ability to install, configure, upgrade, and maintain Mainframe system software and utilities.
  • Experience with third-party Mainframe tools and vendor products, including monitoring, storage, scheduling, or performance management solutions.
  • A proactive approach to troubleshooting, platform reliability, and continuous improvement.
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