Leidos

Leidos has a new and exciting opportunity for a Principal User Interface Developer 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!

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 Principal User Interface (UI) Developer to join our growing application development team. We are looking for a software engineer with expertise in user interface (UI) development who will play a key role in translating system requirements into software specifications, designing intuitive UI components, and implementing software applications in an agile environment.

The ideal candidate must have strong JavaScript skills and experience working with modern application stacks, including microservices and web applications deployed in a cloud-native environment using Kubernetes and Docker.

Responsibilities Include:

• Collaborate with Subject Matter Experts and Systems Engineers to fully understand system requirements and desired user experience (UX).
• Design and develop user interface components that enhance usability and performance.
• Assist in the design and development of back-end services to support application functionality.

If you're ready to take on a rewarding role that makes a tangible difference, we encourage you to apply!

Basic Qualifications

• A Bachelor’s degree in Computer Science or a related field, along with 20+ years of experience in software development, contributing to high-impact projects. In lieu of a bachelor's degree, an additional 4 years of software development experience will be required
• Deep expertise in Java and modern software engineering principles
• Strong proficiency in JavaScript, TypeScript, HTML, and CSS
• Experience with React or similar UI frameworks (Vue, Angular)
• Skilled in consuming and creating REST APIs and WebSockets
• Proven ability to design, optimize, and develop software for advanced computing environments
• Expertise in algorithm development with strict performance requirements
• Clearance Requirement: Active TS/SCI with Polygraph

Preferred Qualifications:

• Experience with JavaScript 3D libraries such as Three.js is preferred, but not required

If you're a problem-solver, a strategist, and an engineer who thrives on pushing technology forward, this is the role for you. Join a team where your expertise drives impact and innovation. Apply today!

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Original Posting:

June 3, 2025

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 $148,850.00 - $269,075.00

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.