Senior UI/UX Engineer

The Senior UI/UX Engineer will support the Chinook Program and an Intelligence Community customer, designing and engineering user interfaces that are responsive, intuitive, accessible, and technically sound. This role operates within an Agile environment and contributes across the full development lifecycle.

Location

Alexandria, VA (onsite)

Other listed locations include: Gaithersburg, MD; Chantilly, VA; Englewood, CO; St. Louis, MO; Tucson, AZ. Note: Gaithersburg, MD is the program’s primary work location.

Compensation

USD 107,900 - 195,050 per yearly

Pay Range: $107,900.00 - $195,050.00

Role Summary

The Senior UI/UX Engineer serves as a key contributor for mission-critical applications, leading efforts to translate user needs, mission workflows, and functional requirements into effective UI/IX solutions. The position supports an Agile delivery model and focuses on usability, accessibility, and performance-aware implementation.

Responsibilities

• Lead the design and engineering of modern, intuitive, and 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 across the development lifecycle.
• Develop reusable UI components, patterns, and design standards to promote 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.
• Partner with software engineering teams to help ensure designs are implemented accurately, efficiently, and with appropriate performance considerations.
• Evaluate existing interfaces and identify opportunities to improve 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 support establishment of UI/IX engineering best practices, standards, and patterns.
• Collaborate with test engineers to validate UI functionality and user workflows.
• 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 is required per contract.
• Education and experience: Bachelor’s degree in Computer Science, Software Engineering, or related field and 8-12 years of prior relevant experience, or Master’s with 6-10 years of prior relevant experience.
• Clearance: 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 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
• GitLab CI, Jenkins, JIRA, Confluence
• AWS, C2S, GovCloud
• Docker, Kubernetes
• RMF, STIGs, Section 508/WCAG
• Playwright, Cypress, Selenium
• Figma, Adobe XD, Sketch

Benefits

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

Preferred Qualifications

• Experience supporting Intelligence Community, DoD, or other mission-focused government programs.
• Experience with 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.

Clearance Level Required

Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.

Open Date and Application Timing (U.S. Positions)

Original Posting: August 21, 2026

While subject to change based on business needs, Leidos reasonably anticipates this job requisition will remain open for at least 3 days with an anticipated close date no earlier than 3 days after the original posting date.

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