Sr. UI / UX Front-End Development Engineer

Job Description

Description

Are you ready to join the Leidos all-star team? Through training, teamwork, and exposure to challenging technical work, let Leidos show how to accelerate your career path.

Leidos has an exciting opening. We are seeking a skilled Sr. UI / UX Front-End Engineer. You will develop high-quality web applications using a state-of-the-art technology stack in support of an emerging program. The DOMEX Technology Platform (DTP) program is a next platform utilizing AI to provide cutting edge data enrichment, triage, and analytics capabilities to Defense and Intelligence Community partners. While most tasks are conducted on-site at our client location in Bethesda, MD, we offer a flexible work schedule and occasional remote work. The percentage of remote work will vary based on client requirements / deliverables.

Candidates must have a demonstrated ability to work in a dynamic and challenging environment and possess a solid understanding of the software development life cycle all while working within an Agile framework.

You will work closely with end users, analysts, software and data engineers, and data scientists on the following key tasks :

Develop and maintain web applications using

ReactJS and Python .

Coding, testing, and debugging new and / or existing web applications.

Implementing and refining user interfaces.

Conducting thorough unit testing via automated tooling.

Collaborating with other team members (internal and external) to ensure optimal performance and usability.

Peer reviewing code written by fellow team members.

Utilizing virtualization technologies like Docker and Podman.

You bring enthusiasm and initiative while having the ability to work well with people from different disciplines with varying degrees of technical experience and meet the following qualification s :

Bachelor’s degree in Computer Science, Information Systems, Engineering, Business, or a scientific or technical discipline, plus 8-12 years relevant experience.

Experience with modern front-end libraries such as ReactJS and / or Angular, with a minimum of 2 years professional experience.

Strong proficiency in HTML, CSS, and JavaScript.

Solid understanding of HTTP web requests for fetching JSON data.

Excellent verbal and written communication skills and the ability to write well-documented code.

Must possess an Active Top Secret / SCI clearance and ability to obtain and maintain a Poly.

You will wow us even more if you have some of these :

A genuine passion for creating great user experiences.

Experience with writing frontend unit tests.

Experience with writing backend web API services especially Python.

Experience coding in other such as Python.

Familiarity with NoSQL datastores such as Elasticsearch.

Familiarity with performance optimization techniques.

Up to date with emerging front-end technologies.

#NMECDTP-Leidos

Come break things (in a good way). Then build them smarter.

We're the tech company everyone calls when things get weird. We don’t wear capes (they’re a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for “how it’s always been done.”

Original Posting : October 10, 2025

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 $104,650.00 - $189,175.00

The Leidos pay range for this job level is a general guideline onlyand 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.