Front-End Software Engineer

Ready to build technology that makes a difference? At Leidos, you’ll help shape the future of intelligence operations by developing modern, high-performance web applications for mission-critical systems. As a Front-End Software Engineer supporting a premier Intelligence Community customer, you’ll work alongside experienced engineers and mission users to deliver capabilities that directly support national security.

Leidos Intelligence Sector combines technology-enabled services and mission software capabilities in the areas of cyber, logistics, security operations, and decision analytics to support our defense and intelligence customers’ missions to defend against evolving threats around the world. Our team’s focus is to ensure our customers have the right tools, technologies, and capabilities to keep pace with an evolving security landscape. Geospatial Analyst Solutions Directorate, part of the National Solutions Business Area, is currently seeking a skilled and experienced Mid-Level Front-End Software Engineer for the Maru Program. The Maru Program delivers mission-critical, modern software solutions across our customer’s enterprise using Agile, DevSecOps, and cloud-native methodologies.

As a Front-End Software Engineer, you will design, develop, integrate, and maintain responsive web applications supporting complex mission workflows. You will work closely with backend engineers, product owners, and end users to translate mission requirements into reliable, intuitive, and production-ready front-end capabilities.

The ideal candidate has strong hands-on experience with modern JavaScript frameworks and front-end software development, along with experience integrating applications with backend services and REST APIs.

Clearance Level Required

Active TS/SCI with the ability to successfully pass a Polygraph examination.

Essential Responsibilities

• Front-End Development: Design, develop, test, and maintain responsive web applications using modern JavaScript frameworks such as React, Angular, or similar technologies.
• Application Integration: Integrate front-end applications with REST APIs, backend services, and data sources.
• Software Development: Develop reusable, maintainable, and scalable front-end components following modern software engineering practices.
• User Interface Development: Translate requirements and user workflows into intuitive, functional interfaces for complex mission applications.
• Performance Optimization: Troubleshoot and improve application performance, responsiveness, reliability, and scalability.
• Testing & Debugging: Perform front-end testing, debugging, code reviews, and defect resolution throughout the software development lifecycle.
• DevSecOps: Participate in CI/CD pipelines, source control, automated builds, and application deployment processes.
• Cross-Functional Collaboration: Work closely with backend engineers, product owners, testers, and mission users to deliver integrated software capabilities.
• Agile Development: Participate in Agile development activities including sprint planning, backlog refinement, demonstrations, and retrospectives.

Basic Qualifications

• U.S. citizenship is required per contract.
• Bachelor’s degree in Computer Science, Software Engineering, or related field with 4–8 years of relevant experience, or Master’s degree with 2–6 years of relevant experience.
• Strong hands-on experience with JavaScript, HTML, and CSS.
• Experience developing applications using a modern front-end framework such as React, Angular, or similar.
• Experience integrating front-end applications with REST APIs and backend services.
• Experience developing, debugging, and maintaining production web applications.
• Experience with source control tools such as Git.
• Experience working in Linux-based environments.
• Ability to translate technical and user requirements into functional software solutions.
• Strong troubleshooting and problem-solving skills.

Preferred Qualifications

• Experience with TypeScript.
• Experience with CI/CD pipelines and automated front-end build/deployment workflows.
• Experience with Docker, containers, or containerized application environments.
• Experience with GitLab and GitLab CI/CD.
• Experience with AWS or other cloud environments.
• Experience with data visualization technologies such as Grafana or similar tools.
• Familiarity with accessibility and usability best practices.
• Experience working in Agile software development environments.
• Experience developing applications supporting data-intensive or GEOINT mission workflows.
• Familiarity with UI design/prototyping tools such as Figma is a plus.

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:

October 15, 2026

Pay Range:

Pay Range $87,100.00 - $157,450.00

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.