Senior Software Engineer Security Clearance

Position: Senior Software Engineer with Security Clearance
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- Description Leidos has a new and exciting opportunity for a Senior Software Engineer to play a dual role in User Interface Development and Full Stack Development within our Intelligence Sector, Cyber & Analytics Business Area (CABA). 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! This position is eligible for a 25k sign on bonus! Are you looking for a dynamic and challenging opportunity to support a complex program for the Warfighter? Look no further—this is an exciting time to contribute to a mission-critical initiative with lasting impact. Leidos is seeking a highly skilled Senior Software Engineer to play a dual role in User Interface (UI) Development and Full Stack Development.

This position provides the opportunity to design, develop, and optimize software solutions in an agile environment, leveraging modern technologies to drive impactful results. The ideal candidate should have strong JavaScript expertise and experience working with modern application stacks, including microservices and cloud-native environments utilizing Kubernetes and Docker.

Responsibilities Include:

User Interface (UI) Development:
* Collaborate with Subject Matter Experts and Systems Engineers to refine system requirements and enhance user experience (UX).

* Design and develop intuitive UI components that maximize usability and performance.

* Implement React or similar UI frameworks (Vue, Angular) to build user-friendly interfaces.
Full Stack Development:
* Develop and maintain web services and interfaces that integrate seamlessly with UI components.

* Build new product features and APIs, ensuring scalable and efficient solutions.

* Contribute to front-end and back-end development processes, optimizing overall system performance.

* Perform testing, troubleshoot software, and apply bug fixes to ensure reliability. Basic Qualifications

* Education & Experience:

Bachelor’s degree in Computer Science or related field, plus 14 years of software development experience (or 18 years without a degree).

* Technical Expertise:
Knowledge of Java, JavaScript, HTML, and CSS.

* Front-End Development:

Experience with React or similar UI frameworks (Vue, Angular), and advanced UI design skills.

* Software Engineering:
Proven ability to design, optimize, and develop solutions for advanced computing environments.

* Cloud &

Infrastructure: Hands-on experience with AWS and modern software engineering principles
* Clearance Requirement:
Active TS/SCI with Polygraph Desired Experience
* Strong Java developer familiar with Selenium Java

* Strong UI background/skills

* React (preferably, but minimally, a similar framework like Vue or Angular)

* Java Script

* Type Script

* CSS

* Git

* VSCode

* Web Sockets

* Linux (Red Hat)

* Bonus:
Prime React, Cesium, Leaflet, UX/Balsamiq, Docker, Kubernetes At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.” If you’re already scheming step 20 while everyone else is still debating step 2… good.

You’ll fit right in. Original Posting:
January 6, 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 $ - $ 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 Leidos is…