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. Day to Day Job Duties: Legacy System Analysis 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 Reverse Engineering & Documentation 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 Mainframe Development & Operations 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 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 (DB2/VSAM → cloud databases) Batch-to-real-time processing transition Collaborate with architects on Strangler Fig implementation Integration & Interfaces Analyze and support integrations using IBM MQ Series ,SFTP / batch file transfers External interfaces and EDI pipelines Document upstream/downstream dependencies across MES modules

Basic Qualifications: • Minimum 10+ years of experience in IBM z/OS mainframe environments • Experience with: o COBOL (batch and online) o JCL (job control, scheduling, troubleshooting) o DB2 (SQL, schema design, performance tuning) o VSAM/GSAM file systems o IMS DB/DC (preferred) • Experience with: o TSO/ISPF, SDSF, and standard mainframe utilities • Experience in large-scale transaction processing systems (preferably MMIS or financial systems) Preferred Qualifications: • Experience with Medicaid/MMIS or healthcare claims systems • Exposure to mainframe modernization tools and strategies • Familiarity with: o API enablement of legacy systems o Data migration to cloud platforms • Understanding of 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 Bachelors in computer science or related field