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

Responsibilities

• 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)
• Required Qualifications
• 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
• .
• As part of our commitment to a safe and trustworthy workplace, we include background and reference checks in our hiring process.
• If you like wild growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us!

Benefits

Additional Information

It's fun to work in a company where people truly BELIEVE in what they're doing! Job Description Summary: Rocket Software is seeking a Mainframe Engineer to join the zAssure Security Portfolio team. This role focuses on deep system-level engineering, security analysis, and advanced diagnostics within z/OS environments. 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.

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