Mainframe Developer

*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.

Job Description

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. This will be a full-time contract opportunity and be hybrid onsite in Trenton, NJ.

What You'll Do

• 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

What You'll Need

Required:

• Minimum of 8 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