An developer specializes in creating functional modeling methodologies for systems design. They utilize (Integration Definition for Function Modeling), a modeling language that represents the functions of a system and their interrelationships. This includes defining data flows, inputs, outputs, and mechanisms of the system. The developer's tasks involve identifying system boundaries, creating diagrams to represent processes, and documenting functions and their interactions. They work closely with business analysts and stakeholders to understand system requirements, ensuring the system design aligns with the organization's goals. Their expertise aids in system understanding, analysis, design, and improvement.