Senior UI/UX Engineer

Leidos is seeking a Senior UI/UX Engineer to support the Chinook Program for an Intelligence Community customer in Gaithersburg, MD (onsite). In this role, you will design and engineer modern interfaces that are intuitive, responsive, and accessible, helping translate mission needs into practical UI solutions within a collaborative Agile environment.

The work focuses on mission-critical applications where usability, performance, and accurate implementation matter. You will partner across product, design, engineering, systems, and mission stakeholders to validate concepts, improve existing user experiences, and raise the bar for UI/IX engineering standards across the program.

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.
• Use 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.
• Partner with software engineering teams to ensure designs are implemented accurately, efficiently, and with appropriate performance considerations.
• Evaluate existing interfaces and identify opportunities to improve usability, accessibility, responsiveness, and the 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.
• Collaborate with test engineers to ensure UI functionality and user workflows are thoroughly validated.
• Provide technical mentorship and guidance to less-experienced engineers.
• Help drive continuous improvement of the program’s UI/IX capabilities and development processes.

Requirements

• US citizenship is required per contract.
• Bachelor’s degree in Computer Science, Software Engineering, or related field and 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 professional experience developing modern web-based user interfaces and user experiences.
• Proficiency with HTML, CSS, JavaScript/TypeScript, and Python.
• Experience with modern UI frameworks such as 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 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
• AWS (C2S or GovCloud), Docker, Kubernetes
• GitLab CI, Jenkins, JIRA, Confluence
• RMF, STIGs

Benefits

• Health and Wellness programs
• Income Protection
• Paid Leave and Retirement

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 tools such as Playwright, Cypress, Selenium, or equivalent.
• Experience mentoring engineers and providing technical leadership within a multidisciplinary Agile team.

Location

• Gaithersburg, MD (program’s primary work location) (onsite)
• Alexandria, VA
• Chantilly, VA
• Englewood, CO
• St. Louis, MO
• Tucson, AZ

Clearance level required: Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.

Salary range: USD 107,900 - 195,050 per year.

Experience required: 6+ years.

Posting date: August 21, 2026.

Security notice: Leidos cautions applicants about fake opportunities using Leidos’ name. Leidos will never ask for payment-related information during the application process and will communicate only through emails generated by the Leidos.com automated system.