Senior z/OS Systems Programmer - Mainframe Modernization

GL Global; United States; On-site; USD 120,000 - 170,000; Full time

Job summary

GL Global is seeking an experienced z/OS Systems Programmer to join a global financial services organization and play a key role in a major Mainframe modernization program. The role spans IBM Mainframe platforms, emphasizing reliability, performance, and innovation within a complex enterprise-scale environment.

You will install, configure, upgrade, and maintain z/OS system software and subsystems, lead upgrades and maintenance, and collaborate with cross-functional teams to deliver robust,

Qualifications

• Extensive experience with IBM z/OS Mainframe environments.
• Deep knowledge of JES, SMP/E and TSO/ISPF.
• Solid JCL experience and mainframe scripting skills (REXX/CLIST).
• Proven ability to install, configure, upgrade, and maintain mainframe software.
• Experience with third-party mainframe tools for monitoring, storage, scheduling or performance.

Responsibilities

• Install, configure, and maintain z/OS system software and subsystems.
• Lead upgrades, patching, maintenance, and performance optimization.
• Investigate and resolve complex Mainframe issues.
• Contribute to platform migrations, integrations, and modernization projects.
• Ensure security, compliance, and regulatory requirements.
• Collaborate with infra, engineering, and application teams to deliver robust solutions.

Skills

z/OS expertise

Mainframe automation

JCL

TSO/ISPF

REXX scripting

CLIST

Tools

JES

SMP/E

TSO/ISPF

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.