Mainframe Assembler Consultant

We’re looking for a mainframe contractor to work on low-level systems tooling in our IBM z/OS test environment.

What you’ll do: Write and maintain HLASM code that runs as part of the runtime and subsystem environment Build and package modules and analyse 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 What you’ll bring:

8+ years hands-on z/OS experience, with significant time spent below the application layer Strong HLASM required, and 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)

Nice to have: Db2 language interface internals, CICS global user exits and thread safety, IMS DL/I or MQ internals, SMP/E, experience with z/OS trace or diagnostic tooling, or IBM Z certifications.