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# IBM z/OS mainframe Software Specialist

- **Company:** NTT DATA, Inc.
- **Location:** Plano, TX, United States
- **Experience:** Expert
- **Salary:** $77,120.0 - $145,240.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Batch Files, COBOL (Programming Language), Databases, Data Migration, IBM DB2, Software Debugging, File Systems, Job Control Language (JCL), IBM Mainframe, IBM WebSphere MQ, IBM Information Management System, Systems Analysis, Mainframes, Medicaid Management Information Systems (MMIS), Performance Tuning, Reverse Engineering, SQL Stored Procedures, SQL Databases, Virtual Storage Access Methods, Z/OS, Tso/ispf, File Transfer Protocol (FTP), Real Time Systems, Information Technology, Legacy Systems
- **Published:** November 5, 2026
- **Apply:** https://www.careerbuilder.com/job-details/ibm-z-os-mainframe-software-specialist-plano-tx--93ac8ef6-8d4f-4397-b1df-9319b0578f74

## About the Role

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

## 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