Sr. Software Engineer TS/SCI Polygraph HANOVER

Leidos has a new and exciting opportunity for a Software Engineer 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, 401K 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! The Software Engineer will support the design, development, testing, deployment, and maintenance of a Data Dictionary capability that provides metadata specification, storage, and access services. This system includes a Java/Spring-based backend, RESTful APIs, and a web-based user interface. The engineer will work independently to implement features, contribute to architectural decisions, and support full lifecycle software delivery within a collaborative Agile environment. Responsibilities Primary responsibilities include: Develop, maintain, and enhance Java/Spring applications supporting: A web-based user interface for creating and managing metadata specifications, including attributes and valid values A database solution for storing specifications RESTful services enabling programmatic access to specifications Design and implement backend services and APIs Contribute to system architecture, technical design, and engineering best practices Develop and maintain database schemas, queries, and integrations Support CI/CD pipelines, deployment activities, and operational readiness Collaborate with cross-functional teams, stakeholders, and system integrators Mentor junior engineers and provide technical guidance Required Qualifications Active TS/SCI clearance with Polygraph up front (no sponsorship available) Bachelor’s degree in Computer Engineering, Computer Science, or a related technical field Four (4) additional years of software engineering experience may be substituted for a bachelor’s degree, for a total of twelve (12) years of experience Minimum of eight (8) years of software engineering experience Minimum of three (3) years of experience in SIGINT, IA, or IT domains Minimum of three (3) years of experience with modern Java and Spring/Spring Boot development Experience developing RESTful APIs and JSON-based web services Strong SQL and relational database experience, including PostgreSQL or equivalent technologies Experience working in Linux development environments Desired Qualifications Java/J2EE application development Spring Framework and Spring Boot PostgreSQL and SQL database design User interface design, development, and testing REST, XML, and JSON web services Linux-based systems Docker and Kubernetes CI/CD pipelines and deployment automation Task tracking and ticketing systems such as JIRA or Redmine Clear, professional communication of technical ideas, status, and issues to both peers and management At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you – apply today If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares. Original Posting: June 11, 2026 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 $131,300.00 - $237,350.00 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. Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here. Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to View email address on click.appcast.io. Commitment and Diversity 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.