A Define and Develop developer is responsible for understanding project requirements, defining software solutions, and developing them into functional applications. They work closely with stakeholders to understand their needs, then define the technical specifications to meet these needs. They design the architecture and choose the appropriate technologies for the project. Once the plan is defined, they develop the software, ensuring it functions as expected, is secure, and user-friendly. They also test, debug, and improve the software as needed. They must keep up-to-date with new technologies and be able to adapt their skills to changing requirements.