Internship Application Software Engineer Jobs in Washington

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!

Leidos is seeking a Software Engineer to join an Agile development team supporting the modernization and enhancement of a mission-critical enterprise application. This position offers the opportunity to modernize a Java-based system by migrating from a traditional Apache Tomcat deployment to a cloud-native architecture built on Spring Boot, Docker, Kubernetes, Angular, and modern software engineering practices. The ideal candidate is passionate about modern software engineering and enjoys modernizing existing enterprise applications using Java, Spring Boot, RESTful APIs, relational databases, and container technologies. The successful candidate will have the opportunity to influence technical design decisions while helping shape the future architecture of a mission-critical system.

• Analyze user and system requirements to design, develop, test, and maintain Java and Angular applications.
• Design, develop, and support RESTful APIs, service integrations, and data access components for Oracle, PostgreSQL, and other relational databases.
• Support application modernization initiatives, including Spring Boot migration, database modernization, microservices, and containerization.
• Deploy and support containerized applications in Kubernetes environments across cloud and on-premises infrastructure.
• Participate in architecture reviews, code reviews, troubleshooting, technical design, and continuous process improvement.
• Develop automated unit and integration tests, support CI/CD pipelines, and maintain technical documentation using Confluence and Jira.
• Provide backup database administration support for Oracle, PostgreSQL, and MariaDB while cross-training across application, database, and deployment technologies to ensure operational continuity.

Required Qualifications

• TS/SCI with Polygraph.
• Bachelor's degree in computer science or related discipline from an accredited college or university.
• Minimum eight (8) years of software engineering experience on programs and contracts of similar scope, type, and complexity.

Preferred Qualifications

• Experience developing Java enterprise applications using Spring Boot (or similar frameworks) and Angular (or comparable front-end technologies).
• Experience designing and implementing RESTful APIs and integrating applications with Oracle, PostgreSQL, MariaDB, or other relational databases.
• Experience with application modernization, including Spring Boot migrations, microservices, and database modernization initiatives.
• Experience developing, deploying, and supporting containerized applications using Docker, Podman, and Kubernetes platforms (e.g., Rancher, Amazon EKS, OpenShift).
• Familiarity with Kubernetes concepts including Deployments, Services, ConfigMaps, Secrets, Ingress, Persistent Volumes, Helm charts, and cloud-native architectures.
• Experience implementing GitLab CI/CD pipelines, automated testing, DevSecOps practices, and modern software delivery processes.
• Experience using Jira and Confluence in Agile environments, providing database operational support, and working with XML, JSON, or other structured data formats.

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:July 27, 2026Pay Range:Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline onlyand 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.