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Robert Half Logo Robert Half · IT - Software Development

Senior COBOL Mainframe Developer

United States, Bellevue Employment contract · Job Posted May 27, 2026
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Job Description

Robert Half is seeking a Senior COBOL Mainframe Developer with AWS experience to support an established insurance and financial services organization. This role focuses on building APIs and integration layers to expose data from legacy mainframe systems, while supporting ongoing maintenance (KTLO) and new capability development.

Job Responsibility

  • Develop, enhance, and maintain IBM mainframe applications supporting legacy insurance and retirement systems
  • Build and support APIs and integration layers to expose mainframe data and functionality to downstream platforms
  • Maintain and enhance COBOL-based systems, including batch processing and online transactions
  • Support KTLO (Keep the Lights On) work, production stability, and ongoing system maintenance
  • Design and implement AWS-based solutions as needed to support integrations and platform capabilities
  • Participate in technical design discussions to ensure system reliability, scalability, and long-term stability
  • Contribute to new capability development on top of existing legacy systems (not net-new policy platforms)

Requirements

  • 10+ years of hands-on IBM mainframe development experience in production environments
  • Strong experience with: COBOL, CICS, DB2, JCL, VSAM
  • Experience building or supporting APIs on the mainframe
  • Strong understanding of legacy systems, batch processing, and transaction-based architectures
  • Hands-on AWS experience is required, (AWS architect-level experience is not required.)
  • Experience with SOAP and/or REST integrations
  • Ability to work independently in a distributed team environment without dedicated AWS-only engineers

Nice to have

  • Experience with Vantage or similar annuity / insurance policy administration systems
  • Prior experience in insurance or financial services environments
  • Familiarity with AI-assisted development tools
  • Experience supporting or working across multiple versions of COBOL

What we offer

  • medical, vision, dental, and life and disability insurance
  • enrollment in company 401(k) plan
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