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).
• Support IMS DB/DC (transactions, hierarchical databases).
• Handle 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 to cloud databases).
• Transition batch-to-real-time processing.
• Collaborate with architects on Strangler Fig implementation.

• Analyze and support integrations using IBM MQ Series, SFTP, batch file transfers.
• Document upstream/downstream dependencies across MES modules.
• Support external interfaces and EDI pipelines.

• 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).
• Bachelor's degree in computer science or related field.

• 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.
• 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.

Where required by law, the starting pay range for this role is $77,120–$145,240. The actual compensation will depend on a number of factors, including the candidate’s relevant experience and technical skills. This position may also be eligible for incentive compensation based on individual and/or company performance and is eligible for company benefits including medical, dental, and vision insurance with an employer contribution, flexible spending or health savings account, life and AD&D insurance, short and long‑term disability coverage, paid time off, employee assistance, participation in a 401(k) program with company match, and additional voluntary or legally‑required benefits.

NTT DATA is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status.