Leidos is hiring a Senior UI/UX Engineer to support the Chinook Program for an Intelligence Community customer. In this onsite role based in Chantilly, VA, you will design and engineer modern, mission-critical interfaces while working in a collaborative Agile environment.
Your work will focus on turning complex mission requirements and workflows into responsive, intuitive, accessible UI solutions. You will also partner across design, engineering, systems, and mission stakeholders to ensure the experience matches user needs from concept through delivery.
Responsibilities
- Lead the design and engineering of modern, intuitive, responsive user interfaces for mission-critical applications.
- Translate user needs, mission workflows, and functional requirements into effective UI/IX solutions.
- Collaborate with product owners, UX/UI designers, software engineers, systems engineers, and mission stakeholders throughout the development lifecycle.
- Develop reusable UI components, patterns, and design standards to support consistency and maintainability across the program.
- Apply user-centered design principles to simplify complex workflows and improve usability.
- Build and refine interactive prototypes and proof-of-concept interfaces to validate concepts with stakeholders.
- Work with software engineering teams to ensure designs are implemented accurately and efficiently, with appropriate performance considerations.
- Evaluate existing interfaces and identify improvements across usability, accessibility, responsiveness, and overall user experience.
- Participate in Agile ceremonies including PI Planning, backlog refinement, sprint planning, demonstrations, and retrospectives.
- Contribute to technical discussions and help establish UI/IX engineering best practices, standards, and patterns.
- Partner with test engineers to ensure UI functionality and user workflows are thoroughly validated.
- Provide technical mentorship and guidance to less-experienced engineers.
- Support continuous improvement of the program’s UI/IX capabilities and development processes.
Requirements
- US citizenship required per contract.
- Bachelor’s degree in Computer Science, Software Engineering, or related field with 8-12 years of prior relevant experience, or Master’s degree with 6-10 years of prior relevant experience.
- Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.
- Strong experience developing modern web-based user interfaces and user experiences.
- Proficiency with HTML, CSS, JavaScript/TypeScript, and Python.
- Experience with modern UI frameworks including React, Angular, Vue.js, or Django.
- Demonstrated understanding of responsive design, component-based development, and modern front-end engineering practices.
- Experience translating complex requirements and user workflows into intuitive interface solutions.
- Experience working in an Agile/Scrum or SAFe environment.
- Strong communication and collaboration skills across technical and non-technical teams.
- Strong analytical and problem-solving skills for complex technical and user-experience challenges.
- Experience with CI/CD tools (GitLab CI, Jenkins) and agile collaboration tools (JIRA, Confluence).
- Familiarity with cloud environments such as AWS (C2S or GovCloud) and containerization technologies (Docker, Kubernetes).
- Understanding of secure coding practices and government system accreditation processes (e.g., RMF, STIGs).
Technologies
- HTML, CSS, JavaScript/TypeScript, Python
- React, Angular, Vue.js, Django
- CI/CD tools (GitLab CI), Jenkins
- JIRA, Confluence
- AWS (C2S or GovCloud), Docker, Kubernetes
- RMF, STIGs
Benefits
- Health and Wellness programs
- Income Protection
- Paid Leave
- Retirement
Clearance Level Required
- Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.
Additional Locations
- Gaithersburg, MD
- Alexandria, VA
- Chantilly, VA
- Englewood, CO
- St. Louis, MO
- Tucson, AZ
Preferred Qualifications
- Experience supporting Intelligence Community, DoD, or other mission-focused government programs.
- Experience working on applications involving complex data visualization, geospatial information, intelligence workflows, or mission systems.
- Experience with React and TypeScript and modern front-end development tooling.
- Experience developing or consuming RESTful APIs and integrating UI applications with backend services.
- Experience with design systems, reusable component libraries, and UI standards.
- Familiarity with Figma, Adobe XD, Sketch, or similar UX/UI design tools.
- Experience with accessibility standards such as Section 508/WCAG.
- Experience developing dashboards, data visualization, maps, or highly interactive mission interfaces.
- Experience working within a cloud-based environment, particularly AWS.
- Experience with automated UI testing and tools such as Playwright, Cypress, Selenium, or equivalent.
- Experience mentoring engineers and providing technical leadership within a multidisciplinary Agile team.
Location: Chantilly, VA (onsite)
Pay Range: USD 107,900 - 195,050 per yearly
Minimum Experience: 6 years
Education: Master’s degree
Original Posting: August 21, 2026
