Sr. Marklogic Developer

Job Description

Leidos has a new and exciting opportunity for a Sr. Mark Logic Developer in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos
, we offer competitive benefits, including paid time off, 11 paid holidays, 401(k) with a 6% company match and immediate vesting, flexible schedules, discounted stock purchase plans, technical ups­killing, education and training support, parental paid leave, and much more. Join us and make a difference in national security!

This Java developer role with strengths in developing Mark Logic-based applications provides Agile Dev Ops support to mission‑critical systems. You will have the opportunity to build and maintain systems, software, and cloud environments, while providing operations and maintenance for critical systems. In this role, you will also design, develop, and implement applications utilizing Mark Logic databases with business logic written in XQuery.

Additionally, based on a Dev Ops framework, you will participate in and/or direct major deliverables of projects through all aspects of the software development lifecycle, including scope and work estimation, architecture and design, coding, and unit testing.

• Design and develop solutions integrating Mark Logic with existing enterprise platforms and systems.
• Develop XQuery, JavaScript, and REST modules on the Mark Logic technology stack.
• Develop entity models and participate in software programming initiatives using HTML, CSS, JavaScript, Java, Angular, Python, Spring Boot, and Hibernate.
• Develop and direct software system validation and testing methods using JUnit and Katalon.
• Develop and integrate custom software solutions leveraging automated deployment technologies; while supporting the Agile software development lifecycle following Program SAFe practices.
• Analyze (proof of concept, performance, and end-to-end testing) and effectively coordinate infrastructure needs driven by developed software to meet customer mission needs.

• 4+ years of hands‑on application development utilizing the Mark Logic framework.
• Strong analytical and design skills, with the ability to translate business requirements into efficient and effective technical designs within large‑scale, well‑structured enterprise environments.
• Significant experience in the development of service‑oriented architecture applications.
• Good understanding of object‑oriented design and design patterns.
• Significant experience implementing the Mark Logic Java‑client‑API within an enterprise application.
• Strong knowledge of XQuery, FLWOR queries, JavaScript, Mark Logic, SPARQL, RDF data, XML data, triple‑stores, XML processing.
• Significant experience with Java and data processing, manipulation or querying (SQL and No
  
  SQL).
• Bachelor's with 8+ years of relevant experience or a master's with 6+ years of relevant experience. Work experience will be considered in lieu of a degree.
• TS/SCI with a polygraph is required for consideration.

• Experience developing in or deploying to AWS.

Pay Range: $ – $

Leidos pays a competitive compensation package that includes health and wellness programs, income protection, paid leave, and retirement benefits. More details are available at

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission‑innovation solutions. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for fiscal year ended January 3 2025. For more information, visit

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.