Staff Software Engineer, Mission Applications - Clearance Required

Overview LMI is seeking a Staff Software Engineer to build mission applications for a U.S. Army enterprise data platform. This engineer will own user-facing capabilities from architecture through production delivery and help transition required functionality from legacy systems into the modern environment. This is a hands-on role for an engineer who can work across the stack, make sound technical decisions, and turn complex user needs into reliable software. LMI is a new breed of digital solutions provider dedicated to accelerating government impact with innovation and speed. Investing in technology and prototypes ahead of need, LMI brings commercial-grade platforms and mission-ready AI to federal agencies at commercial speed. Leveraging our mission-ready technology and solutions, proven expertise in federal deployment, and strategic relationships, we enhance outcomes for the government efficiently and effectively. With a focus on agility and collaboration, LMI serves the defense, space, healthcare, and energy sectors—helping agencies navigate complexity and outpace change. Headquartered in Tysons, Virginia, LMI is committed to delivering impactful results that strengthen missions and drive lasting value. Responsibilities - Own the architecture and delivery of user-facing mission applications. - Build responsive interfaces, backend services, APIs, and data integrations. - Work directly with users and product stakeholders to understand workflows and refine capabilities. - Transition required functionality from legacy applications without disrupting operational use. - Establish strong practices for 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. Qualifications Minimum Qualifications - Bachelor’s degree in computer science, software engineering, or a related field, or equivalent practical experience. - Eight or more years of professional software-engineering experience. - Strong experience with modern front-end development and at least one backend programming language. - Experience designing APIs, application services, and data-intensive systems. - Strong software-engineering fundamentals, including automated testing, source control, CI/CD, and production monitoring. - Demonstrated ownership of a major software capability from architecture through deployment. - Experience supporting a Department of Defense customer. - Active Secret clearance. Preferred Qualifications - Experience supporting the U.S. Army. - Experience with React, TypeScript, Python, Java, Go, or Node.js. - Familiarity with AWS, Palantir Foundry, Army Vantage, or comparable platforms. - Experience modernizing or replacing legacy applications. - Experience building software in secure or regulated environments. - Familiarity with AI-assisted software-development tools. Target salary range: $111,000 - 190,000 Disclaimer: The salary range displayed represents the typical salary range for this position and is not a guarantee of compensation. Individual salaries are determined by various factors including, but not limited to location, internal equity, business considerations, client contract requirements, and candidate qualifications, such as education, experience, skills, and security clearances. Job Locations US-VA-Newport News