IBM z​/OS mainframe Software Specialist

Job Description:

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.

• Analyze end-to-end mainframe application landscape, including COBOL programs (online and batch) DB2, IMS databases.
  
  VSAM/GSAM file structures
• Understand 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, and 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
• Assist in Data migration (DB2/VSAM → cloud databases)
• Batch-to-real-time processing transition
• Collaborate 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