Sr. Applications Software Engineer

Leidos Holding$154K — $278K *
Information Technology
15+ years of experience
Job Overview by Ladders

Qualifications

  • BS Degree in Computer Science/Computer Engineering or equivalent with 17+ years of relevant experience, or a Master's with 15+ years of prior experience.
  • Active Secret Clearance is required.
  • Proficient in web-based technologies: HTML, CSS, JavaScript.
  • Experience with Scrum or other Agile methodologies (e.g., SAFe, XP).
  • Familiar with UI/Development Frameworks such as AngularJS, Ionic, React, Node.js.
  • Knowledge of Automated Testing Tools/Technologies like Selenium, Cucumber, BDD.
  • Experience with Test Driven Development (TDD).

Responsibilities

  • Develop web services and full stack web applications in an Agile Scrum environment.
  • Implement robust persistence layers and ensure maintainable code using best practices.
  • Apply secure software development principles in all coding activities.
  • Collaborate with cross-functional teams including engineers and quality assurance.
  • Set standards for Test Driven Development (TDD) practices within the team.
  • Mentor junior software engineers to foster skill development.
  • Utilize continuous integration and test automation processes effectively.

Benefits

  • Access to advanced technology in Cybersecurity and Information Assurance.
  • Opportunities for professional growth and mentoring roles.
  • Collaborative Agile work environment to enhance teamwork.
  • Engagement in meaningful projects supporting national security.
  • Requirement for DoD 8570 approved security certification within 90 days of hire.
Full Job Description
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 an expert in 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. The candidate will also mentor junior software engineers.

Basic Qualifications:
  • BS Degree in Computer Science/Computer Engineer or equivalent and 17+ years of relevant experience or a Masters with 15+ years of prior experience
  • 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)


Original Posting:
July 9, 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.

About Leidos Holding

Leidos Holding Careers

Joining Leidos Holding presents an unparalleled opportunity to advance one's career with a leader in innovation and technology. The company offers a plethora of job opportunities aimed at fostering professional growth and development in a diverse and inclusive environment.

Explore Career Opportunities

Leidos Holding is actively seeking skilled professionals who are passionate about leveraging their expertise to drive innovation and leadership in their fields. With a variety of open positions, Leidos Holding provides a platform for individuals to challenge themselves in a dynamic work environment.

Innovation and Professional Growth

At Leidos Holding, innovation is at the core of everything they do. Employees are encouraged to think creatively and push boundaries. The company supports this drive for innovation through comprehensive professional development and diversity training programs that are designed to enhance skills and foster leadership.

Commitment to Diversity and Inclusion

Leidos Holding is committed to creating a workplace where diversity is not only recognized but celebrated. With a culture that values and promotes diversity, Leidos Holding ensures that all team members have the opportunity to contribute, learn, and grow.

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For those starting their career, Leidos Holding offers internship programs that provide a robust foundation in the industry. Internships are a great way to develop essential skills, gain valuable work experience, and build professional networks.

Benefits and Culture

Employees at Leidos Holding enjoy a range of benefits designed to support their professional and personal lives. The company culture is built on a foundation of respect and integrity, providing a supportive and collaborative environment where every team member is valued.

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Leidos Holding is hiring! Explore job opportunities that match your skills and interests. Leidos Holding looks for driven, curious, and innovative individuals to join their team. Positions are available across various disciplines and experience levels.

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Networking and Career Advancement

Leidos Holding encourages its employees to engage in networking within the company to discover new opportunities for career advancement. The leadership team at Leidos Holding is dedicated to supporting employees in their career paths with ample opportunities for networking and growth.

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Discover the exciting career opportunities at Leidos Holding today. With a commitment to employee growth, innovation, and diversity, Leidos Holding is the perfect place to advance your career. Check out the latest job listings and find your perfect fit at Leidos Holding.

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