Senior Software Engineer – Defense Apps (Clearance)

LMI Consulting, LLC; Fort Belvoir (VA); On-site; USD 134,000 - 279,000; Full time

Job summary

LMI is seeking a Staff Software Engineer to build user-facing defense applications for a U.S. Army modernization program. This role owns capabilities from user need through production delivery using Palantir Foundry and modern web technologies.

This hands-on engineer will work across the stack, shape architecture, and collaborate with Army users and product teams to deliver secure, scalable software. Onsite support 2–3 days weekly at Ft. Belvoir, VA.

Qualifications

• Bachelor's degree or equivalent practical experience in computer science or software engineering.
• Eight or more years of professional software-engineering experience.
• Strong proficiency with JavaScript or TypeScript, React, and modern web-application development.
• Experience developing backend services, APIs, and data-intensive applications.
• Experience building applications on Palantir Foundry or a comparable enterprise data platform.
• Demonstrated ownership of a significant software capability from architecture through production deployment.
• Experience supporting a Department of Defense customer.
• Active Secret clearance

Responsibilities

• Own the design and delivery of user-facing defense applications.
• Build responsive interfaces, backend services, APIs, and data integrations.
• Develop applications using Palantir Foundry capabilities and modern web frameworks.
• Work directly with Army users and product designers to understand workflows and refine capabilities.
• Establish strong practices for architecture, testing, code review, security, CI/CD, and production operations.
• Diagnose complex application and integration issues across the stack.
• Mentor engineers and contribute to technical decisions across the broader platform.

Skills

JavaScript/TypeScript

React

Backend services

Palantir Foundry

Security clearance

Education

Bachelor's degree in computer science, software engineering, or a related field

Tools

Palantir Foundry

Job description

LMI is seeking a Staff Software Engineer to build user-facing defense applications for a U.S. Army modernization program. This role owns capabilities from user need through production delivery using Palantir Foundry and modern web technologies.

This hands-on engineer will work across the stack, shape architecture, and collaborate with Army users and product teams to deliver secure, scalable software. Onsite support 2–3 days weekly at Ft. Belvoir, VA.