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# Mainframe Developer

- **Company:** Leidos, Inc.
- **Location:** Pikesville, MD, United States
- **Experience:** Expert
- **Contract:** Contract
- **Skills:** Agile Methodology, Artificial Intelligence, Business Logic, Unit Testing, Batch Processing, Customer Information Control System (CICS), CLIST, COBOL (Programming Language), Computer Programming, Databases, IBM DB2, Database Schema, Database Storage Structures, Software Debugging, Programming Tools, Endevor, Human-Computer Interaction, Job Control Language (JCL), IBM Mainframe, Rexx (Programming Language), Integrated Development Environments, Interactive System Productivity Facility (ISPF), Mainframes, Systems Development Life Cycle, Software Configuration Management, Software Construction, Z/OS, Diagnostic Tools, Syncsort, File-aid, Legacy Systems, Control M
- **Published:** November 11, 2026
- **Apply:** https://www.dice.com/job-detail/2a4dae72-fe97-4862-a0ac-25a10d4dd63a

## About the Role

Eight to ten years of experience developing legacy applications on IBM z/OS.

 * Hands-on experience developing, debugging, and maintaining COBOL applications that use CICS, DB2, IDMS, copybooks, and CICS maps.
 * Hands-on experience with CICS applications, screen development and abends, including interactions between COBOL programs and BMS maps that define the user interface.
 * Experience using Endevor or a comparable mainframe software configuration management system to manage legacy element workflows.
 * Hands-on experience with ISPF, TSO, JES, z/OS, and mainframe utilities.
 * Hands-on experience creating and modifying JCL for job execution, supporting batch jobs in day-to-day operations.
 * Experience with Control-M or similar mainframe job-scheduling tool(s).
 * Strong requirements elicitation, analytical, technical writing, and communication skills, including the ability to document project requirements and analysis.
 * Strong attention to detail and a demonstrated ability to complete repetitive, integration/production-oriented tasks accurately and on time.
 * Ability to research problems independently and develop effective solutions.
 * Hands-on experience of the legacy technologies listed in job specification.
 * Good understanding in SDLC specially in legacy development environment.
 * Experience with modern development tools, software, AI tools, and methodologies.
 * Familiarity with Agile frameworks, Agile terminology and Agile practices.

Relevant certification, such as IBM Mainframe Developer Professional, or Interskill - IBM Mainframe Application Programmer, or IBM Mainframe Application Programmer COBOL and IBM Enterprise COBOL for z/OS Programming

## Description

* Develop and maintain COBOL, REXX, JCL, CLIST, CICS, IDMS, and DB2 code and database structures in accordance with client standards and software engineering best practices.
 * Use mainframe utilities and diagnostic tools, including SYNCSORT, File-AID, SuperC, Abend-AID, SPUFI, QMF, Xpediter, and InterTest.
 * Perform unit testing and validate results against expected outcomes.
 * Assess how database schema changes affect existing software components.
 * Diagnose and resolve application defects involving COBOL, CICS configurations, IDMS, DB2, business logic, and databases.
 * Design, develop, test, debug, and implement modernized solutions for legacy applications using appropriate technologies and engineering practices.
 * Create, update, and support JCL for reliable and efficient batch processing.
 * Evaluate the effects of new operating systems and COBOL versions on the existing legacy application inventory.
 * Collaborate with internal teams, client counterparts, and vendor teams. Provide technical guidance and help stakeholders achieve project and business objectives.
 * Communicate status, risks, and technical information clearly to Leidos leads, client counterparts, teams, and vendors at the appropriate level of detail.
 * Perform other duties as assigned or directed.