Role: Sr.Mainframe Developer

Location: NJ,Hybrid(Only Local Candidates)

Duration: Long Term

Must have 12+years of experience

Job Description

We are seeking an experienced Senior Mainframe Developer with deep expertise in I/O configuration management to support our IBM Z environment.

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

Required Skills:

•  12+ 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