IBM z/OS mainframe Software Specialist

About the role

Provide deep technical expertise across the IBM z/OS mainframe ecosystem, supporting legacy MMIS assessment, reverse engineering, and modernization initiatives. This role focuses on analyzing and stabilizing COBOL-based, DB2/IMS-backed, batch-driven systems, and enabling their transition to a modern, modular MES architecture.

Responsibilities

• Analyze end-to-end mainframe application landscape, including:
  • COBOL programs (online and batch)
  • DB2, IMS databases
  • VSAM/GSAM file structures
  • System flows across claims processing, financial transactions, interfaces, and batch cycles
• Perform code and job flow walkthroughs to document current-state architecture
• Extract and document:
  • Business rules and processing logic (claims edits, pricing, adjudication workflows)
  • Data models and file structures (DB2 tables, VSAM datasets)
• Create functional specifications, data flow diagrams, interface and dependency mappings
• Develop, maintain, and troubleshoot:
  • COBOL programs (batch and online)
  • JCL scripts for job execution and scheduling
• Work extensively with:
  • DB2 (SQL, stored procedures, performance tuning)
  • IMS DB/DC (transactions, hierarchical databases)
  • VSAM/GSAM (file handling and access methods)
• Utilize tools such as TSO/ISPF, SDSF, File Manager, Debugger
• Support transformation initiatives by:
  • Identifying candidates for refactor, replatform, or rewrite
  • Mapping legacy logic to modern services and APIs
  • Assisting in data migration (DB2/VSAM → cloud databases)
  • Transitioning batch-to-real-time processing
  • Collaborating with architects on Strangler Fig implementation
• Analyze and support integrations using IBM MQ Series, SFTP/batch file transfers, external interfaces, and EDI pipelines
• Document upstream/downstream dependencies across MES modules

Requirements

• Minimum 10+ years of experience in IBM z/OS mainframe environments
• Experience with:
  • COBOL (batch and online)
  • JCL (job control, scheduling, troubleshooting)
  • DB2 (SQL, schema design, performance tuning)
  • VSAM/GSAM file systems
  • IMS DB/DC (preferred)
  • TSO/ISPF, SDSF, and standard mainframe utilities
• Experience in large-scale transaction processing systems (preferably MMIS or financial systems)

Qualifications

• Experience with Medicaid/MMIS or healthcare claims systems
• Exposure to mainframe modernization tools and strategies
• Familiarity with:
  • API enablement of legacy systems
  • Data migration to cloud platforms
  • CMS SMC or regulatory environments (nice to have)
• Project lead experience
• Strong analytical and reverse engineering capabilities
• Ability to interpret complex batch workflows and dependencies
• Collaboration with architects, SMEs, and modernization teams
• Clear documentation and communication skills
• Bachelor’s in computer science or related field

Benefits

• Medical, dental, and vision insurance with employer contribution
• Flexible spending or health savings account
• Life and AD&D insurance
• Short and long-term disability coverage
• Paid time off
• Employee assistance program
• 401k program with company match
• Additional voluntary or legally-required benefits
• Incentive compensation based on individual and/or company performance

Pay

The starting pay range for this role is $77,120–$145,240. Actual compensation will depend on the candidate’s relevant experience, technical skills, and other qualifications.

About NTT DATA

NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers, and application services. Our consulting and industry solutions help organizations and society move confidently and sustainably into the digital future.