Senior UI/UX Engineer

Leidos is looking for a Senior UI/UX Engineer to support the Chinook Program for an Intelligence Community customer in Englewood, CO. In this onsite role, you will design and engineer modern, responsive, accessible interfaces for mission-critical applications within a collaborative Agile environment.

What you’ll do

• 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 across product ownership, UX/UI design, software engineering, systems engineering, and mission stakeholders throughout the development lifecycle.
• Develop reusable UI components, patterns, and design standards to improve 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 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 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.

Required qualifications

• US citizenship is required per contract.
• Master’s degree (or Bachelor’s in Computer Science, Software Engineering, or a related field) and relevant experience: 8-12 years with a Bachelor’s, or 6-10 years with a Master’s.
• Active Top Secret/SCI clearance 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 working through 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 container technologies (Docker, Kubernetes).
• Understanding of secure coding practices and government system accreditation processes (for example, RMF, STIGs).

Technologies

• HTML, CSS, JavaScript, TypeScript, Python
• React, Angular, Vue.js, Django
• GitLab CI, Jenkins, JIRA, Confluence
• AWS (C2S or GovCloud), Docker, Kubernetes
• RMF, STIGs, CI/CD
• Agile/Scrum, SAFe, Polygraph, Top Secret/SCI

Preferred qualifications

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

Clearance

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

Compensation and benefits

Pay Range: $107,900.00 - $195,050.00 (annual).

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

Location: Englewood, CO (onsite). Original posting date: August 21, 2026.