Senior Full Stack Developer

LMI is seeking a talented and mission-driven Senior Full Stack Software Engineer to design, develop, and modernize secure, scalable, cloud-native software applications and platforms supporting critical federal missions. This role will help transform how government organizations build, deploy, integrate, and manage modern digital capabilities through intuitive applications, robust backend services, and reliable platform integrations.

In this hands-on engineering role, you will design, develop, integrate, and maintain full-stack software solutions using TypeScript, Angular, Node.js or Python, PostgreSQL, and modern API-driven architectures. You will take ownership of complex features and production applications, make sound architectural decisions, and build secure, maintainable solutions that operate across cloud and on-premises environments. You will collaborate closely with product teams, platform engineers, cybersecurity professionals, and government stakeholders to deliver modern digital capabilities that improve operational efficiency, accelerate software delivery, and support mission-critical operations.

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

• Design, develop, test, and maintain secure, scalable full-stack web applications supporting enterprise platforms and mission-critical federal operations.
• Build responsive front-end interfaces using TypeScript, Angular, and modern web development frameworks.
• Develop back-end services, business logic, and RESTful APIs using Node.js or Python.
• Design and optimize databases, queries, and application data access layers using PostgreSQL.
• Independently lead complex software features and make architectural decisions that balance scalability, security, and maintainability.
• Support application modernization through cloud-native architectures, reusable components, and automated workflows.
• Implement secure coding practices, authentication, automated testing, and DevSecOps processes, including CI/CD pipelines.
• Troubleshoot production issues, improve application performance, and leverage AI-assisted development tools to enhance engineering productivity.
• Mentor engineers and collaborate with product, platform, and cybersecurity teams to translate requirements into effective technical solutions.

Minimum Qualifications

• Seven or more years of professional software engineering experience, including ownership of production full-stack applications.
• Strong experience with TypeScript, Angular, JavaScript, and modern front-end development.
• Strong experience developing back-end services and RESTful APIs using Node.js or Python.
• Experience with PostgreSQL, SQL, and relational database design.
• Demonstrated ability to independently lead complex features, make architectural decisions, and deliver production-ready solutions.
• Experience with authentication, authorization, secure application development, automated testing, and production troubleshooting.
• Experience with Git, CI/CD pipelines, and modern DevSecOps practices.
• Ability to work independently with evolving requirements, mentor engineers, and collaborate effectively with technical teams.
• Experience using AI-assisted development tools within a disciplined engineering workflow.
• U.S. citizenship and the ability to obtain and maintain a government security clearance.

Preferred Qualifications

• Bachelor's degree in computer science, software engineering, information systems, or a related technical discipline.
• Experience developing platform-as-a-service (PaaS) solutions, internal developer platforms, or cloud-native software products.
• Experience with Kubernetes, Docker, cloud platforms, and automated deployment workflows.
• Familiarity with federal cybersecurity and compliance requirements, including NIST security controls and FISMA.
• A strong software engineering portfolio, open-source contributions, or demonstrated experience building software products independently.

Target salary range: $140,000-$250,000

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.

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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.