Full Stack Developer UI/UX

Leidos; United States; On-site; USD 131,300 - 237,350; Full time

Job summary

Leidos is seeking a UI/UX Engineer to join a team building innovative software supporting entitlement programs and Identity & Access Management. You will create accessible WordPress-based sites for admins and end users, bridging design, development, and production with QA input.

The role requires hands-on coding, design input, and collaboration in a fast-paced environment. The position emphasizes WordPress theme/plugin development, front-end/back-end optimization, and adherence to accessibility

Qualifications

• Active TS/SCI with Polygraph.
• Requires BS degree and 12+ years of relevant experience.
• Experience with WordPress front-end development: HTML5, SASS/CSS, JavaScript.
• Experience with WordPress back-end development: PHP, MySQL, WP REST API, JSON.
• Developing custom features and functionality for WordPress.
• Creating WordPress plugins.
• Producing unit testing and QA.
• Developing and Testing for Accessibility.

Responsibilities

• Create well-structured and maintainable WordPress themes from scratch.
• Develop WordPress plugins to support custom site functionality and integrations.
• Improve back-end efficiency including database and server integration.
• Maintain and optimize WordPress themes and plugins.
• Conduct website performance tests and optimize for speed.
• Monitor live website performance and troubleshoot UX issues.
• Handle both back-end and front-end development for WordPress implementations.

Skills

Front-end development

Agile methodology

Usability

Accessibility

Communication skills

Education

Bachelor's degree

Tools

WordPress

HTML5

CSS/SASS

JavaScript

PHP

MySQL

WP REST API

JSON

Job description

Description

Leidos has immediate opportunities for a UI/UX Engineer to join a team building innovative software supporting the Sponsor's Entitlement Programs as well as IdAM /ICAM, Authentication, Authorization, Attributes and Digital Policy Management. We're supporting a well-established customer that is responsible for critical and high-visibility missions applications used by a wide audience. Our team is tremendously talented, and we need to add a talented and creative UIUX Engineer to the team.

As a UI/UX Engineer you will build custom and accessible websites, with the user experiences in mind for both admins and end users. You will optimize code within the code base, assist with design, implementation and deployment, and partner on QA testing and bug-fixing. Your role will help determine appropriate tools, methods, and solutions for projects, bridging design, development, and production of websites. The position requires strong organizational and time management skills as individuals work in a fast-paced environment with multiple projects. Successful candidates must be hands-on but also strategic, with excellent communication skills.

Primary Responsibilities

• Proven ability to create well-structured and maintainable WordPress site themes from scratch.
• Proficiency in developing WordPress plugins to support custom site functionality and integrations.
• Good eye for design and attention to detail
• Improve the overall efficiency of the website's back-end including database and server integration
• Maintain and optimize the WordPress theme and plugins
• Conduct website performance tests, and execute performance enhancements to improve site speed
• Monitor the performance of the live website and troubleshoot content and user experience issues that arise
• Responsible for both back-end and front-end development including the implementation of WordPress themes and plugins as well as site integration

• Effective interpersonal and communication skills are required to perform well as a member of a rapid paced, cross-functional team environment.
• Utilize agile development methodology

Required Qualifications

• Active TS/SCI with Polygraph
• Requires BS degree and12+ years of prior relevant. Additional experience in lieu of degree.
• Understanding of usability and accessibility issues across all device types
• Experience with WordPress front-end development using the following technologies: HTML5, SASS (or equivalent preprocessor)/CSS, and JavaScript
• Experience with WordPress back-end development using the following technologies: PHP, MySQL, WP REST API, JSON
• Developing custom features and functionality for WordPress
• Creating WordPress plugins
• Producing unit testing and QA
• Developing and Testing for Accessibility

Desired Qualifications

• Certification - Amazon Web Services (AWS)

FIP

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:

May 29, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .

Pay and Benefits

Pay and benefits are fundamental to any career decision. That\'s why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .

Securing Your Data

Beware of fake employment opportunities using Leidos\' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [e-mail] .

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission .

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.