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 -based, /-backed, batch-driven systems, and enabling their transition to a modern, modular MES architecture. Day to Day Job Duties: Legacy System Analysis Analyze end-to-end mainframe application landscape, including programs (online and batch) , databases./ 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 Reverse Engineering & Documentation Extract and document Business rules and processing logic,Claims edits, pricing, and adjudication workflows.Data models and file structures ( tables, datasets) Create Functional specifications ,Data flow diagrams ,Interface and dependency mappings Mainframe Development & Operations Develop, maintain, and troubleshoot programs (batch and online) scripts for job execution and scheduling. Work extensively with (SQL, stored procedures, performance tuning) DB/DC (transactions, hierarchical databases) / (file handling and access methods) Utilize tools such as TSO/ISPF, , File Manager, Debugger Modernization Support Support transformation initiatives by Identifying candidates for refactor, replatform, or rewrite Mapping legacy logic to modern services and APIs Assist in Data migration (/ → cloud databases) Batch-to-real-time processing transition Collaborate with architects on Strangler Fig implementation Integration & Interfaces Analyze and support integrations using , / batch file transfers External interfaces and pipelines Document upstream/downstream dependencies across MES modules