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# Software Engineer III (Mainframe Assembler(HLASM)- z/OS Security & Systems (zAssure Portfolio)

- **Company:** Rocket Software, Inc.
- **Location:** United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Data Structures, IBM DB2, Software Debugging, Job Control Language (JCL), Rexx (Programming Language), Interactive System Productivity Facility (ISPF), Mainframes, Performance Tuning, IBM Resource Access Control Facility, System Software, Virtual Storage Access Methods, Z/OS, Diagnostic Tools, Scripting, Git, Software Version Control
- **Published:** June 13, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=860234b3623d38ff

## About the Role

Do you have experience in Technical customer support solution?, This is a highly specialized role requiring strong expertise in z/OS internals, HLASM (Assembler), and system-level debugging. The role combines product engineering with complex troubleshooting and customer-facing escalation support, making it critical to the success of our security solutions.

The ideal candidate brings hands-on experience working with low-level system constructs, the ability to diagnose complex production issues, and a strong ownership mindset., * Minimum 10 years of experience in z/OS environments

 * Strong expertise in: HLASM (Assembler) z/OS internals (mandatory)
 * Hands-on experience with: JCL, ISPF, SDSF Batch job debugging and system diagnostics
 * Proven experience in: Collecting and analyzing GTF traces (required) Debugging low-level system issues
 * Strong understanding of: APF authorization, SVC, PC, memory and execution model z/OS security concepts (RACF awareness)
 * Experience with Git or modern version control Strong problem-solving, debugging, and analytical skills

Highly Desirable

 * REXX scripting experience
 * Knowledge of: System exits, hooks, and intercepts
 * Performance tuning and advanced diagnostics
 * Exposure to: DB2, VSAM, or system-level data structures
 * Experience supporting customer escalations / L3 roles

Work Model

 * Collaborate with global (US-based) teams
 * Flexibility for overlapping time zones when required
 * Operate with high ownership and minimal supervision

## Description

* Design, develop, and maintain HLASM-based components for z/OS security and system tooling (VAP and related products)
 * Diagnose complex issues using z/OS diagnostic tools (including GTF traces)
 * Analyze APF-authorized programs, SVCs, PC routines, and system behavior
 * Perform deep root cause analysis for performance, system failures, and security exposures
 * Work with JCL, ISPF, SDSF, and system utilities to debug and validate behavior
 * Collaborate with engineering and support teams on L3 escalations and product fixes
 * Contribute to tooling, automation, and modernization efforts
 * Apply modern development practices (Git, AI-assisted debugging/workflows)


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