IBM z/OS mainframe Software Specialist

NTT DATA Services•Plano, TX

1d•$77,120 - $145,240•Onsite

About The Position

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.

Requirements

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

Nice To Haves

Experience with Medicaid/MMIS or healthcare claims systems
Exposure to mainframe modernization tools and strategies
Familiarity with: API enablement of legacy systems
Familiarity with: Data migration to cloud platforms
Understanding of CMS SMC or regulatory environments (nice to have)
Project lead experience

Responsibilities

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.
Extract and document 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)
Work extensively with IMS DB/DC (transactions, hierarchical databases)
Work extensively with 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
Map legacy logic to modern services and APIs
Assist in Data migration (DB2/VSAM → cloud databases)
Assist in 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
Analyze and support External interfaces and EDI pipelines
Document upstream/downstream dependencies across MES modules