Front End Engineering Jobs

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Leidos St. Louis, MO

St. Louis, MO

Today

$108k - $195k/yr Full time Senior Collaboration Design

Senior UI/UX Engineer role supporting mission-critical mission applications for an Intelligence Community customer on the Leidos Chinook Program.

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 across 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 implementations match designs and include 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.
Support continuous improvement of the program’s UI/IX capabilities and development processes.

US citizenship required per contract.
Education: Master’s degree.
Experience: 6-10 years of prior relevant experience (or 8-12 years with a Bachelor’s degree in Computer Science, Software Engineering, or related field).
Active Top Secret/SCI and ability to successfully pass a Polygraph examination.
Strong experience developing modern web-based UI and UX.
Proficiency with HTML, CSS, JavaScript/TypeScript, and Python.
Experience with modern UI frameworks: React, Angular, Vue.js, or Django.
Demonstrated understanding of responsive design, component-based development, and modern front-end practices.
Experience translating complex requirements and user workflows into intuitive interface solutions.
Experience working in Agile/Scrum or SAFe environments.
Strong communication and collaboration skills across technical and non-technical teams.
Strong analytical and problem-solving skills for complex technical and UI/UX 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).

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 cloud-based environments, 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.

Posting date: August 21, 2026

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