This full-time Senior Software Engineer role supports the Missile Defense Agency by developing and maintaining software for the Missile Defense System Ground Test scenario design. The position involves designing and coding .NET Core web applications and services, managing SQL database structures, and collaborating with cross-functional teams to modernize defense testing tools. Key responsibilities include implementing mathematical models for sensors and weapons systems, performing full-stack development tasks, and engaging directly with end-users to define requirements. The role appeals to candidates seeking to contribute to national security through cutting-edge defense technology within a culture that values innovation and continuous learning. The position offers a 9/80 work schedule, comprehensive benefits, and the opportunity to work on mission-critical applications in a fast-paced environment. An active Secret clearance and U.S. person status are required.