A Model-based Design developer uses mathematical and graphical methods to simulate and analyze systems. They build models to test functionality, performance, and reliability before actual system implementation. This approach involves designing, simulating, optimizing, and verifying the system model, then deploying and validating it on hardware. The developer uses software like MATLAB and Simulink for modeling and control design. This role requires a strong mathematical background, understanding of control theory, and expertise in specific domains like automotive, aerospace, or robotics. Their work improves system quality, reduces development time, and fosters innovation by allowing early error detection and resolution.