Sr Mainframe Developer

Leidos is seeking a Sr. Mainframe Developer to be part of the mission solution and help lead SSA's Digital Modernization Strategy. Join one of our high performing teams responsible for building the next-generation enterprise APIs and modern responsive user interfaces, supporting the Social Security Administration (SSA) and their mission to meet the changing needs of the public, positively impacting at least 65 million American lives per month. We are a team of forward-looking professionals in need of a strong candidate with these key required skills: Strong experience with IBM z/OS (OS/390/MVS) environment developing and maintaining JCL and COBOL, Dialog Manager, Endevor, z/OS, CLIS, JCL, and DB2 for application software systems.

*** Selected candidate must be willing to work on-site in Woodlawn, MD 5 days a week.

If this sounds like a mission you want to be a part of, keep reading!

TEAM CULTURE

Your passion and values might be a good fit for our teams if you answer "yes" to the following questions:

• Are you looking for a company that puts employees first, with a focus on career, flexibility, and well-being?
• Do you enjoy collaborating with colleagues and teammates and believe that the best ideas are fostered in an inclusive environment?
• Are you searching for a team with a strong sense of ownership, urgency, and drive for daily mission success?
• Are you comfortable with proactive outward communication and technical leadership?
• Do you enjoy being a catalyst, solving complex problems, and providing innovative solutions?
• Do you have the flexibility, creativity, and resilience to pivot the mission for success?
• Do you have the courage to make tough ethical decisions with pride, transparency, and respect?

MENTORSHIP & CAREER GROWTH

Our teams are dedicated to supporting new team members in an environment that celebrates knowledge sharing and mentorship. Experienced team members will be assigned to new hires for one-on-one mentoring, collaborative reviews, and coaching on customer engagement to help each new hire successfully onboard and demonstrate their skills. Projects and tasks are assigned in a way that leverages your strengths and will help you further develop your skillset.

DAY TO DAY RESPONSIBILITIES

Every position we take is more rewarding when you know the why behind it. Know your work makes a difference to support those who need it most. If your passion is enabling life changing service to those around, you this is the place for you. Find you passion in a team environment where all members are valued regardless of contractor or employee status. Find your "Why" with us and take your place in our Leidos Family!!

• Responsible for conforming to customer standards and requirements and will be involved in creating and maintaining code and database structures such as COBOL, Restructured Extended Executor (REXX), Job Control Language (JCL), CLIST, DB2, as well as numerous mainframe utility tools such as SYNCSORT, File-AID/Related Data XPERT (RDX), etc. Responsible for unit testing and validation against desired outcomes. The resource is expected to function as part of a team, maintain a high level of collaboration with SSA of customers, and must demonstrate excellent communication skills to ensure success.
• Develop JCL and software code using customer defined standards and software engineering best practices
• Evaluate impacts of database schema changes on existing software components
• Investigate and repair application defects related to business logic, middleware, or database (DB2).
• Design, develop, test, debug, and implement next-generation COBOL programs using software engineering, best practices and latest technologies
• Create and update JCL for efficient batch processing
• Evaluate the impact of new operating systems, or versions of COBOL and Endevor on programs.
• Collaborate with internal teams and external vendors, offering technical advice and influencing key stakeholders to achieve strategic objectives and enhance Leidos business outcomes.
• Investigate and repair application defects regardless of component: COBOL, business logic, CICS configurations, middleware, or database (PL/SQL and Data Modeling).
• Brief management, customer, team, or vendors using written or oral skills at appropriate technical level for audience
• All other duties as assigned or directed.

FOUNDATION FOR SUCCESS (Basic Qualifications)

• Bachelor's Degree in Computer Science, Mathematics, Engineering or a related field. Additional years of experience may be substituted in lieu of degree.
• Masters or Doctorate degree may substitute for required experience
• 8+ years of experience with Mainframe.
• Must be able to obtain and maintain a Public Trust. Contract requirement.

FACTORS TO HELP YOU SHINE (Required Skills)

These skills will help you succeed in this position:

• Experience developing and maintaining COBOL applications including working with structures, copybooks, and CICS maps
• Experience developing applications for use on IBM z/OS.
• Experience debugging COBOL Programs, CLIST, PROC, COBOL error tracing, and using Visual Studio COBOL viewer.
• Basic experience with CICS programs, including how COBOL programs interact with BMS maps that define to user interface.
• Experience using Endevor with TADZ for reporting and analysis such as browsing, scanning elements, measuring usage statistics.
• Working knowledge / experience with ISPF, TSO, JES, and Job Control Language (JCL).
• Experience developing and modifying JCL for job execution and batch operations
• Hands-on experience with batch and online processing.
• Excellent communication and written skills
• Experience with mainframe-based software configuration management systems such as Endevor.
• Experience with Control-M or other mainframe-based job scheduling tools.
• Detail oriented and committed to consistently completing repetitive production-like tasks on-time and error-free.
• Ability to independently research problems and provide solutions.

HOW TO STAND OUT FROM THE CROWD (Desired Skills)

Showcase your knowledge of modern development through the following experience or skills:

• Working knowledge of SAS and REXX.
• Experience with Mainframe Assembler development.
• Certification such as IBM Mainframe Developer Professional, Interskill - Mainframe Application Programmer - COBOL and IBM Enterprise COBOL for z/OS Programming
• Solid knowledge of relational databases (PostgreSQL, DB2), and SQL
• Experience with modern development software, tools, and methodologies.
• Experience working on Agile projects and understanding Agile terminology.
• Experience with DevOps and toolset (Git/Bitbucket, Docker, Jenkins, SonarQube)

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. We empower our teams and contribute to our communities. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business. Every position we take is more rewarding when you know the why behind it. Know your work makes a difference to support those who need it most. If your passion is enabling life changing service to those around, you this is the place for you. Find your passion in a team environment where all members are valued regardless of contractor or employee status. We are excited for you to take your place in our Leidos Family.

Are you an or US resident and think you might fit? We recommend you apply and start the conversation today! Join us in supporting our SSA contracts in Woodlawn, Maryland.

ITSSCII

At Leidos, we don't want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, "what's next?" before the dust settles on "what's now."

If you're already scheming step 20 while everyone else is still debating step 2... good. You'll fit right in.

Original Posting:
October 28, 2025

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $104,650.00 - $189,175.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.