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

The
Senior Mainframe Developer
will support a critical legacy platform (MACSS) within a large-scale modernization
initiative. This role is key to stabilizing and enhancing the core mainframe applications while enabling integration with modern API and event-driven
platforms.

You will play a pivotal role in supporting production
systems, delivering enhancements, and ensuring seamless integration with
z/OS
Connect-based services
as part of a broader digital transformation program.

Key Responsibilities
:

• 
  Own
  and support a
  core mainframe application (MACSS)
  across production,
  enhancements, and project initiatives
• 
  Develop
  and maintain applications using
  COBOL, JCL, DB2, and CICS
• 
  Troubleshoot
  and resolve production issues across batch and online systems
• 
  Collaborate
  with API and platform teams to enable integration via
  z/OS Connect
  services
• 
  Support
  data flows and service exposure to downstream platforms (
  APIM, Kafka
  ,
  etc.)
• 
  Participate
  in system design discussions to support modernization and integration
  efforts
• 
  Ensure
  performance, reliability, and scalability of legacy systems

This position is critical in enabling the organization’s
transition to a modern, API-driven architecture by ensuring the stability and
scalability of its core legacy systems.

Requirements

• 
  8+
  years of hands-on
  mainframe development experience
• 
  ​
  Strong
  expertise in:

• 
  COBOL
• 
  JCL
• 
  DB2
• 
  CICS
• 
  Proven
  experience supporting
  production systems and critical applications
• 
  Experience
  working in
  large enterprise environments
  (preferably utilities,
  banking, or insurance)
• 
  Strong
  debugging and problem-solving skills in complex legacy environments

Preferred Qualifications:

• 
  Utilities industry experience.
• 
  Experience
  with
  IBM z/OS Connect
• 
  Exposure
  to API enablement of mainframe systems
• 
  Familiarity
  with event-driven architectures (Kafka or similar)
• 
  Experience
  supporting systems undergoing
  modernization or digital transformation.