Senior Mainframe Systems Programmer

About the role

As a Senior Mainframe Systems Programmer, you’ll work on low-level systems tooling in an IBM z/OS test environment. The work is Assembler‑centric and sits below the application layer (module‑level changes, subsystem exits, and the diagnostics around them), working alongside the infrastructure, application and security teams. If you’re comfortable with vendor‑supplied modules, module maps and dumps, then this role is for you.

Responsibilities

• Write and maintain HLASM code that runs as part of the runtime and subsystem environment
• Build and package modules and analyze load modules
• Work with access methods (VSAM, QSAM) and Language Environment at the control‑block level
• Develop and install subsystem exits (CICS, Db2, IMS or MQ)
• Use JCL and REXX to automate build, install and verification steps
• Troubleshoot dumps and abends, and demonstrate that a change is behavior‑neutral before it ships

Requirements

• 8+ years of hands‑on z/OS experience, with significant time spent below the application layer
• Strong HLASM skills (not substitutable by COBOL or PL/I experience)
• Binder and linkage‑editor fluency
• Working knowledge of Language Environment internals, VSAM/QSAM control blocks, and the z/OS authorization model (APF, authorized concatenations)
• Comfort with JCL and REXX
• Dump and abend analysis (IPCS, SLIP, GTF or component trace)

Qualifications

• Db2 language interface internals
• CICS global user exits and thread safety
• IMS DL/I or MQ internals
• SMP/E experience
• Experience with z/OS trace or diagnostic tooling
• IBM Z certifications

Skills

• English: Proficient

Benefits

• Flexible work options and Unlimited Vacation Plan
• 24/7 virtual healthcare and extensive wellness portal supporting physical, mental, emotional and financial well‑being
• Access to thousands of top‑rated online courses and certifications through partnerships with world‑renowned education leaders
• Exclusive leadership programs and tuition reimbursement for external training
• Employee Share Purchase Plan with matched contributions