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Senior Developer – IBM z/OS Connect

icon building Company : Ittconnect
icon briefcase Job Type : Full Time

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Job Description - Senior Developer – IBM z/OS Connect





ITTConnect is seeking a Senior Mainframe Developer - IBM zOS Connect to work on site for a client in the Columbus, OH area. This is a contract position with a client that is a global leader in consulting, digital transformation, technology and engineering services with over 300,000 team members in nearly 50 countries. The end client is in the Utilities sector.


 

Job location: Columbus, OH or Nashville, TN (both locations would be for on site work)

We are seeking a Senior Developer with strong expertise in IBM z/OS Connect to support Gigawatt.ai modernization initiatives by designing and building new z/OS-based services integrated with MACSS (legacy utility management mainframe application). This role focuses on exposing mainframe capabilities as modern APIs and enabling seamless enterprise integration.

Key Responsibilities:



  • Design, develop, and deploy RESTful APIs using IBM z/OS Connect

  • Build and expose mainframe services (CICS, IMS, DB2) to distributed systems

  • Integrate z/OS services with MACSS and other enterprise platforms

  • Translate business requirements into scalable API-based solutions

  • Ensure performance, security, and reliability of z/OS services

  • Collaborate with cross-functional teams (middleware, integration, application teams)

  • Troubleshoot and resolve issues across z/OS and API layers

  • Support modernization initiatives by enabling API-driven mainframe access


Requirements



  • Strong hands-on experience with IBM z/OS Connect (EE preferred)

  • Solid background in z/OS environment (CICS, IMS, DB2)

  • Experience building and consuming REST APIs

  • Knowledge of JSON, OpenAPI/Swagger

  • Familiarity with mainframe integration patterns

  • Strong debugging and performance tuning skills on z/OS

  • Experience working in enterprise, high-availability environments

Nice to Have:



  • Experience with API management tools (e.g., IBM API Connect)

  • Exposure to middleware/integration platforms

  • Understanding of security protocols (OAuth, JWT, RACF)

  • Prior experience with legacy system modernization initiatives







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