Senior Mainframe Developer

at Leidos
Location Milford Mill, MD
Date Posted May 3, 2021
Category Default
Job Type Contractor



Job Description:

Leidos is seeking a Senior Mainframe Developer for Baltimore location.

The Senior Mainframe Developer is an accomplished technical leader, proactive customer-focused advocate, a team player with substantial software engineering experience. The candidate will provide hands-on experience with enterprise software development of Mainframe, legacy modernization via API integration, implementation, test automation, and SOA/Microservice architecture to a cross-functional software development team. The ideal candidate will have a good foundation with COBOL, JCL, CICS, VSAM, SOA, REST, and DB2/SQL

The candidate must demonstrate a willingness to learn new innovative technologies and overcome technical challenges in a fast-paced environment.

Day to Day Responsibilities:

  • Provide software expertise in one or more of these areas: Java/JMS integration, Legacy mainframe integration, service oriented architectures (SOA), security (JWT/oAuth/API Key)
  • Investigate and repair application defects regardless of component: business logic, integration server, integration interfaces, or database (PL/SQL and Data Modeling).
  • Architect, design and develop integration solutions for legacy mainframe applications
  • Advice/mentor on design and implementation of design patterns and industry best practices to develop secure robust integration solutions.
  • Brief management, customer, team, or vendors using written or oral skills at appropriate technical level for audience
  • All other duties as assigned or directed


  • Bachelor's Degree in Computer Science, Mathematics, Engineering, or a related field
    • Master’s or Doctorate’s degree may substitute for required experience
    • 10+ years of experience with full lifecycle development
    • 10+ years of experience with zOS Mainframe, COBOL, DB2, VSAM, and JCL analysis, design, and development
    • 10+ years of experience with Mainframe CICS web services and CICS Transaction Gateway
  • U.S. citizen or legal right to work in the United States without sponsorship

Required Skills:

  • Strong experience with Mainframe development, COBOL, CICS web services, VSAM, and 3270 terminal emulation
  • Working knowledge of batch systems and scheduling (Control-M)
  • Experienced in Mainframe tools (TSO, Endevor)
  • Excellent knowledge of relational databases (DB2, PostgreSQL), and SQL
  • Knowledge and experience in EntireX, CONNX and ApplinX for building mainframe integrations.
  • Development experience in building integrations using Flow, Java Services, JMS based design patterns

Desired Skills:

  • An in-depth knowledge of Social Security Administration (SSA) mainframe development environment
  • Knowledge of API Gateway and policy design
  • Preferred solid knowledge with Java EE, Java generics and Java APIs.
  • Preferred experience with API development & monitoring tools (Postman, Swagger, Splunk, Dynatrace)
  • Preferred experience with delivery (CI/CD) best practices and DevOps to production

External Referral Bonus:


Potential for Telework:


Clearance Level Required:

ADP2 / IT2



Scheduled Weekly Hours:




Requisition Category:


Job Family:

Software Development

Pay Range:

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