Senior Full-Stack Software Engineer - Clearance Required

Overview

LMI is hiring a Senior Full-Stack Software Engineer to build applications for national security users. You will own features across the interface, backend services, and data integrations, working directly with users and a small engineering team. You will help define the approach, ship working software, and resolve the problems that emerge in the customer's environment.

You will join a multidisciplinary team within LMI's National Security organization. Work spans technical discovery, rapid prototypes, and selected deployments through initial operational use. The team develops reusable capabilities and transfers them to LMI program or product teams for sustained delivery.

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

• Translate user needs into working application features, with clear acceptance criteria and feedback from the people who will use them.
• Build interfaces, backend services, APIs, and database interactions for workflows such as planning, readiness, autonomy, logistics, and asset visbility.
• Integrate customer systems, identity services, and data sources, working through access and interface constraints with the team.
• Build AI-enabled features connected to clear, usable application workflows.
• Use automated tests, code review, CI/CD, and application monitoring to deploy and improve software.
• Support demonstrations, initial deployments, and troubleshooting. Investigate performance, integration, and reliability issues.
• Document implementation and deployment decisions, contribute reusable components, and support transfer to the sustaining team.
• Travel up to 50% for user engagement, deployment support, and forward deployed engineering.

Qualifications

Required Qualifications

• Experience independently delivering production application features across frontend and backend systems.
• Strong development skills in TypeScript and React or comparable frontend technologies, plus Python, Node.js, or a comparable backend stack.
• Experience with SQL and relational databases, API development, external-system integration, and authentication and authorization.
• Experience with Git, automated testing, CI/CD, containers, and deployment in at least one major cloud environment.
• Ability to diagnose problems across the application stack and make practical improvements to performance and maintainability.
• Ability to work directly with users, make progress from incomplete requirements, and explain implementation choices clearly.
• Demonstrated use of AI coding tools or agents, with independent review, testing, and security checks of generated code.

Preferred Qualifications

• Experience in a small product team or a customer-facing engineering role with ownership through deployment.
• Experience integrating model APIs, retrieval, or agent-driven features into a production application.
• Experience with Palantir Foundry, Databricks, or comparable enterprise data and application platforms.
• Experience delivering software for defense, intelligence, or other customers with significant security or integration constraints.
• An active U.S. government security clearance.

Target salary range is $134367.66 - $232404.55

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.

#LI-SH1

Applicants must meet eligibility requirements for a U.S. Government security clearance. Only US Citizens are eligible for a security clearance. For this position, LMI will only consider applicants with security clearances or applicants who are eligible for security clearances, due to the nature of the work.

Job Locations

US-Remote