Applications Software Engineer

Leidos has a new and exciting opportunity for a Applications 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!  

PROGRAM SUMMARY:

Product development includes tactical mobile development as well as enterprise web application development.  The portfolio of products support the Cybersecurity and Information Assurance domains.  These systems deploy a variety of technologies and communicate with infrastructure interfaces to bring secure, modern-day Cybersecurity and Cryptographic Key Management solutions to the warfighter.

Primary Responsibilities:

The successful candidate will work on a mix of web service development, full stack web application development and robust persistence layer implementations in an Agile Scrum environment.  This involves the use of Themes, Epics, User Stories, acceptance criteria and other system engineering artifacts as part of an Agile team.  He/she will use a variety of software engineering best practices and clean coding techniques to ensure that developed code is maintainable, efficient, reliable, understandable, secure, fault tolerant and meets S.O.L.I.D coding principles.  

The candidate will be knowledgeable about (and apply) secure software development principles and techniques.  He/she will use software tools in cooperation with continuous integration and test automation management process and understand software components and their interface requirements.  The candidate will interface with software engineers, system engineers, information assurance engineers, test engineers, quality assurance, and other project team members.  He/she will be responsible for setting the standards and helping the team adopt and adhere to Test Driven Development (TDD) practices within the Leidos Agile Framework to ensure the proper degree of engineering rigor is applied to all assigned tasks.

Basic Qualifications:

• BS Degree in Computer Science or equivalent and 8+ years of relevant experience. Will consider experience in lieu of a degree.

• Active Secret Clearance (Required)

• Experience with web-based (HTML, CSS, JavaScript) in a web-based environment

• Experience in Scrum Methodology or other Agile environments (e.g., SAFe, XP)

• Experience with UI / Development Frameworks (E.g, AngularJS, Ionic, GWT, SmartGWT, Qt, React, Node.js)

• Experience with Automated Testing Tools/Technologies/Concepts (Selenium, Cucumber, Gherkin, BDD)

• Experience with Test Driven Development (TDD)

• Works well in a team environment and has excellent written and communication skills

• DoD 8570 approved security certification (i.e., Security +) (Will be required 90 days after hire).

Preferred Qualifications:

• Experience with Web Services Architectures (REST, SOAP, AWS)

• Experience with Software CM (e.g., Git, GitHub)

• Experience with Continuous Integration / Quality, and DevOps concepts and tools / technologies (e.g., Ant / Maven, Jenkins, SonarQube, FishEye, Crucible, Gradle, Junit)

• Experience with Security Scanning  (HP Fortify, HP WebInspect)

• Experience with Build Scripts (e.g., Maven, ANT)

• Experience with Mobile Application Development

• Experience with Agile Management Tools and Concepts (e.g., VersionOne, JIRA, Rally, etc.)

• Experience with Web Server Configuration (e.g., JBOSS, Wildfly, Tomcat)

• Experience with Database Development (e.g., Postgres, SQL Server, MySQL, SQLite, Oracle)

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 7, 2026

Pay Range:

Pay Range $107,900.00 - $195,050.00

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.