IBM z/OS mainframe Software Specialist

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

IBM z-OS Operating System, IBM Mainframe Operating System, IBM z-OS Operating System, IBM Mainframe Operating System, Reverse Engineering, Cobol Programming Language, Ecosystems, IBM IMS Database, IBM DB2, Mainframe Computer, * 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

Where required by law, NTT DATA provides a reasonable range of compensation for specific roles. The starting pay range for this role is $77,120- $145,240. Actual compensation will depend on a number of factors, including the candidate’s relevant experience, technical skills, and other qualifications. This position may also be eligible for incentive compensation based on individual and/or company performance. This position 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 401k program with company match, and additional voluntary or legally-required benefits.

NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world’’s leading AI and digital infrastructure providers, with unmatched capabilities in enterprise-scale AI, cloud, security, connectivity, data centers and application services. our consulting and Industry solutions help organizations and society move confidently and sustainably into the digital future. As a Global Top Employer, we have experts in more than 50 countries. We also offer clients access to a robust ecosystem of innovation centers as well as established and start-up partners. NTT DATA is a part of NTT Group, which invests over $3 billion each year in R&D.