Senior Developer – IBM z/OS Connect

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