Senior Full Stack Java Developer Jobs in Castle Rock, CO

LMI is actively seeking a skilled, experienced Senior Full-Stack Software Engineer to join our team in Colorado Springs, CO. This role involves working directly with USSF and US Government customers, as well as analytical partners, to translate wargame, exercise, training, and analytic needs into responsive, high-performance software applications within LMI’s Modeling, Simulation, Prototyping, Wargaming, & Analysis platform, RAPTR®.

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.

This position requires an active Top Secret clearance. 

• Lead the design, development, and maintain full-stack applications using modern front-end frameworks (React, Angular, Vue.js) and back-end technologies (Rust, Python, Java, Node.js etc.)
• Lead the implementation of visually appealing and high-performance user interfaces that improve accessibility and enhance user experience
• Develop and maintain server-side logic, create APIs, and design database schemas to power application functionality and manage data
• Ensure seamless integration between front-end and back-end systems, collaborating closely with other developers
• Implement security measures to protect sensitive data and prevent unauthorized access
• Optimize both front-end and back-end performance for smooth interactions, quick load times, and efficient data handling
• Ensure scalability and responsiveness of applications across different devices, browsers, and as user numbers grow
• Utilize version control systems (e.g., Git) and participate in code reviews to maintain code integrity and quality
• Stay current with software development trends and best practices in full-stack development
• Actively collaborate in cross-functional engineering working groups to review, assess, and mature software artifacts such as system architecture, system behavior, system interfaces and requirements, software test plans, UI/UX designs, functional allocation, Interface Control Documents/Descriptions (ICDs), and data models

Required:
• Bachelor’s degree in Computer Science/Engineering, or equivalent STEM field with 10+ years of experience (8+ years with Master’s degree) in software development
• Significant experience with both modern front-end frameworks (React, Angular) and back-end technologies (Rust, Python, Java) within agile development frameworks
• Strong understanding of JavaScript, HTML5, CSS3, and responsive web design principle
• Experience with both SQL and NoSQL databases, and efficient data storage/retrieval techniques
• Familiarity with cloud platforms (AWS, Azure, or Google Cloud) and back-end frameworks (Django, Flask, Spring, Express.js, etc.)
• Knowledge of UI/UX best practices and accessibility standards for web applications
• Experience with API design, development, and integration
• Familiarity with secure software development practices and CI/CD pipelines
• Strong problem-solving skills and understanding of software performance optimization
• Excellent communication and teamwork abilities
• Active TS Clearance, US Citizenship required

Desired:
• Advanced degree in Computer Science or related field.
• Experience with testing frameworks for both front-end and back-end.
• Familiarity with design tools such as Figma, Sketch, or Adobe XD.
• Knowledge of containerization and orchestration technologies (Docker, Kubernetes)
• Knowledge of cybersecurity best practices, particularly in web development.
• Prior experience working on government-related projects
• Space domain exercise, training, or wargaming experience and familiarity with space-focused software solutions.
• Active TS clearance with SCI eligibility

Target salary range: $110,000 - $190,000. Final compensation will be determined by a variety of factors including but not limited to your skills, experience, education, and/or certifications.

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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.