Leidos is hiring: Sr. UI/UX Front-End Development Engineer in Bethesda

Description

Leidos is seeking a skilled Sr. UI/UX Front-End Engineer to develop high-quality web applications using a state-of-the-art technology stack in support of the DOMEX Technology Platform (DTP) program. The platform uses AI to provide data enrichment, triage, and analytics capabilities for Defense and Intelligence Community partners. Most tasks are on-site at the client location in Bethesda, MD, with a flexible work schedule and occasional remote work; remote work percentage will vary based on client requirements/deliverables.

Candidates must have the ability to work in a dynamic and challenging environment and possess a solid understanding of the software development life cycle 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 qualifications:

• 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 languages 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

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 those 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:

September 15, 2025

Pay Range:

Pay Range $104,650.00 - $189,175.00

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 offering a salary include responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, market data, and applicable laws.