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Senior UI/UX Engineer

Leidos Chantilly, VA

Chantilly, VA

Today

$108k - $195k/yr Full time Python Senior Angular

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Job Description

Leidos is seeking a Senior UI/UX Engineer to support the Chinook Program for an Intelligence Community customer. The role focuses on designing and engineering modern, mission-critical user interfaces within a collaborative Agile environment.

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/UX 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 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.
Partner with software engineering teams to support accurate, efficient implementation and 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/UX 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.
Support continuous improvement of the program’s UI/UX capabilities and development processes.

Required Qualifications

US citizenship is required per contract.
Bachelor’s degree in Computer Science, Software Engineering, or a related field with 8-12 years of prior relevant experience, or a Master’s 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 UI/UX.
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 to address 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

Clearance Level Required

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

Preferred Qualifications

Experience supporting Intelligence Community, DoD, or other mission-focused government programs.
Experience 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 UX/UI design tools such as Figma, Adobe XD, Sketch, or similar.
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.

Benefits

Health and Wellness programs
Income Protection
Paid Leave
Retirement

Location

Chantilly, VA (onsite)

Position may be performed in: Gaithersburg, MD; Alexandria, VA; Chantilly, VA; Englewood, CO; St. Louis, MO; Tucson, AZ.

Compensation

USD 107,900 - 195,050 per year

Education

Master’s degree

Experience

6+ years minimum experience

Posting Date

Original posting: August 21, 2026

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