Sr. Mainframe Developer

PLEASE NOTE: IT IS 100% ONSITE POSITION. Selected candidate must be willing to work on-site in Woodlawn, MD 5 days a week. Selected candidate must be able to obtain and maintain a public trust clearance. KEY REQUIRED SKILLS: Mainframe development, COBOL, CICS, JCL, and DB2 POSITION DESCRIPTION: Develop and maintain COBOL, REXX, JCL, CLIST, CICS, 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, 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. Requirements BASIC QUALIFICATIONS: Master's and 5+ years of experience, Bachelor's and 7+ years of experience or 13+ years in lieu of a degree Eight to ten years of experience developing legacy applications on IBM z/OS. REQUIRED SKILLS: Hands-on experience developing, debugging, and maintaining COBOL applications that use CICS, DB2, 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. DESIRED SKILLS: 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