Sr Mainframe Developer

Sr. Mainframe Developer

Location:
Trenton, NJ Hybrid (3 days Onsite, 2 days Remote)
Duration: 12+ Months

* Local Only, IMB Z/OS, COBOL, Hands-on experience with POR (Power-On Reset) configuration activations and system startups, Proficient in building and managing IOCDS datasets using HCD and IOCP tools.

We are seeking an experienced Senior Mainframe Developer with deep expertise in I/O configuration management to support our IBM Z environment. This hands-on role focuses on configuration delivery, ensuring environment stability, and implementing project-based infrastructure changes.

• Configure and manage mainframe I/O definitions using Hardware Configuration Definition (HCD)
• Generate and implement IOCDS images and coordinate activations across logical partitions
• Analyze and update existing configurations to support hardware changes, migrations, and upgrades
• Troubleshoot I/O pathing, device connectivity, and configuration discrepancies
• Collaborate with internal teams (z/OS systems, storage, network, hardware engineering) to ensure alignment between logical and physical configurations
• Maintain accurate configuration documentation and provide knowledge transfer to permanent staff

Required:

• Minimum of 5 years of experience defining and maintaining I/O configurations for IBM z/OS systems
• Proficient in building and managing IOCDS datasets using HCD and IOCP tools
• Strong knowledge of IBM z/OS operating system internals
• Hands-on experience with POR (Power-On Reset) configuration activations and system startups
• Expertise in troubleshooting and resolving complex I/O configuration issues
• Familiarity with channel paths, control units, and device definitions
• Excellent documentation and communication skills
• Knowledge of Sysplex configurations and dynamic I/O reconfiguration
• Experience in capacity planning and hardware upgrades
• Familiarity with disaster recovery planning for I/O configurations

• Ability to safely and successfully perform the essential job functions consistent with the ADA and other federal, state, and local standards
• Sedentary work that involves sitting or remaining stationary most of the time with occasional need to move around the office to attend meetings, etc.
• Ability to conduct repetitive tasks on a computer, utilizing a mouse, keyboard, and monitor