Senior z/OS Systems Programmer - Mainframe Modernization

GL Global Limited; United States; On-site; USD 110,000 - 170,000; Full time

Job summary

GL Global Limited is seeking an experienced z/OS Systems Programmer to support a major Mainframe modernization program. You will work across IBM Mainframe platforms, combining deep z/OS expertise with automation and platform transformation initiatives.

Join a complex enterprise environment focused on reliability, performance, and innovation, collaborating with cross-functional teams to deliver robust Mainframe solutions.

Qualifications

• Extensive experience with IBM z/OS Mainframe environments.
• Strong knowledge of core z/OS components and subsystems (JES, SMP/E, TSO/ISPF).
• Solid JCL experience with Mainframe automation and scripting tools (REXX, CLIST).
• Experience with third-party Mainframe tools and vendor products (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 optimization.
• Investigate and resolve complex Mainframe system issues.
• Contribute to platform migrations, integrations, and wider modernization projects.
• Ensure systems meet security, compliance, and regulatory requirements.
• Collaborate with infrastructure, engineering, and application teams to deliver robust, reliable solutions.

Job description

We’re looking for an experienced z/OS Systems Programmer to join a global financial services organization and play a key role in a major Mainframe modernization program.

This is an excellent opportunity to work across business-critical IBM Mainframe platforms, combining deep z/OS expertise with modern tooling, automation, and platform transformation initiatives. You’ll be part of a complex, enterprise-scale environment where reliability, performance, and innovation are equally important.

The Role:

• Install, configure, and maintain z/OS system software and core Mainframe subsystems.
• Lead and support system upgrades, patching, maintenance, and performance optimization.
• Investigate and resolve complex Mainframe system issues.
• Contribute to platform migrations, integrations, and wider modernization 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.