A Model Based Systems Engineering (MBSE) developer applies advanced engineering techniques to create comprehensive representations of systems. They design, analyze and simulate system models to optimize performance and predict potential issues. They use tools like UML, SysML, or proprietary software to create these models. They work closely with other engineering teams to understand system requirements and ensure design integrity. This role requires a deep understanding of system architectures, software development, and systems engineering principles. Their work is crucial in the development and implementation of complex systems, providing a structured approach to problem solving and design.