Principal Software Engineer

Leidos has a new and exciting opportunity for a Principal Software Engineer in our Intelligence Sector's, 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! Leidos is seeking a Software Engineer to join a small Agile development team supporting the modernization and enhancement of a mission-critical enterprise application. The successful candidate will contribute to the evolution of a Java-based application with an Angular front end and PostgreSQL backend, currently deployed on Apache Tomcat. The team is modernizing the platform through adoption of Spring Boot, containerization, microservices architecture, and eventual migration to AWS cloud services. The ideal candidate is experienced in modern software development practices and has hands-on expertise with Java, RESTful APIs, cloud-native architectures, document parsing, and application modernization efforts. This position is part of a highly collaborative Scrum team consisting of three developers and one tester, delivering capabilities on a four-week sprint cadence. Primary Responsibilities Analyze user and system requirements to design and implement software solutions. Develop, test, debug, and maintain Java and Angular applications. Design, develop, and maintain RESTful APIs, service integrations, PostgreSQL database interactions, queries, and data access components. Support application modernization efforts, including migration to Spring Boot, decomposition of monolithic functionality into microservices, and application containerization initiatives. Implement and maintain document parsing and data processing capabilities while supporting cloud migration initiatives. Collaborate within an Agile/Scrum team to deliver software capabilities on a four-week sprint cadence. Participate in code reviews, troubleshooting, testing activities, continuous process improvement, technical documentation, and utilization of GitLab CI/CD, Jira, and Confluence to support development and delivery activities. Required Qualifications Bachelor’s degree in Computer Science or related discipline from an accredited college or university. Candidates without Bachelor's degrees will be considered on a case by case basis and require 4 additional years of related experience. Fourteen (14) or more years of experience as a Software Engineer on programs and contracts of similar scope, type, and complexity. Experience developing software using Java and developing web applications using Angular or similar front-end frameworks. Experience designing and implementing RESTful APIs and working with PostgreSQL or other relational database technologies. Experience with application modernization and software architecture evolution. Experience working within Agile/Scrum development teams and creating and maintaining technical documentation. Security Clearance Requirement: Active TS/SCI with Polygraph. Preferred Qualifications Experience migrating applications to Spring Boot. Experience containerizing applications using Docker or similar technologies and designing and implementing microservices architectures. Experience deploying or migrating applications to government AWS cloud environments, including AWS services such as Fargate and Aurora PostgreSQL. Experience implementing and maintaining GitLab CI/CD pipelines and utilizing Jira and Confluence. Experience with document parsing, data extraction, content processing frameworks. KQW conmd 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 4, 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 $154,050.00 - $278,475.00 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.