Job Title: Sr. Mainframe Developer Contract Start & End Date: ASAP - 12/15/2026 (will be extended) Onsite or remote: Hybrid Role (3 days Onsite, 2 days Remote) Worksite address: Trenton, NJ
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 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
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