Senior Full Stack / UI Developer - 25k Sign on Bonus

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 National Security Sector’s (NSS) Cyber & Analytics Business Area (CABA). This position offers a chance to contribute to cutting-edge solutions in a mission-critical environment, leveraging innovative technologies to drive impactful results. 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 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.

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

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: Deep knowledge of Java, JavaScript, HTML, CSS, and Python, with strong proficiency in algorithm development and performance optimization.

• Front-End Development: Experience with React or similar UI frameworks (Vue, Angular), and advanced UI design skills.

• Back-End & Full Stack: Skilled in consuming and creating REST APIs and WebSockets, with expertise in AWS, Node.js, and Ruby on Rails.

• 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

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:

July 11, 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 wit