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Senior UI/UX Engineer

Leidos St. Louis, MO

St. Louis, MO

Today

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

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Job Description

Leidos is seeking a Senior UI/UX Engineer for the Chinook Program, supporting an Intelligence Community customer. The role focuses on designing and engineering modern, intuitive, responsive, accessible, and technically sound user interfaces for mission-critical applications within an Agile environment.

Role Overview

As a Senior UI/UX Engineer, you will lead the creation of user-centered UI/UX solutions that translate user needs, mission workflows, and functional requirements into effective interfaces. You will work across the development lifecycle with product owners, UX/UI designers, software engineers, systems engineers, and mission stakeholders to ensure usability and accurate 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 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 and efficiently, 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 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.

Required Qualifications

US citizenship required per contract.
Bachelor’s degree in Computer Science, Software Engineering, or related field with 8-12 years of relevant experience, or a Master’s degree with 6-10 years of relevant experience.
Active Top Secret/SCI with ability to 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 or GovCloud), Docker, Kubernetes
RMF, STIGs
Agile/Scrum, SAFe, PI Planning

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

Location and Employment Details

Location: St. Louis, MO (onsite)
Primary work locations: Gaithersburg, MD; Alexandria, VA; Chantilly, VA; Englewood, CO; St. Louis, MO; Tucson, AZ
Minimum experience: 6 years
Education: Master’s degree
Pay range: USD 107,900 - 195,050 per year

Benefits

Health and Wellness programs
Income Protection
Paid Leave
Retirement

Posting Date

Original posting date: August 21, 2026.

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