A Front End Engineering Design (FEED) developer is responsible for the initial design and technical specifications of a project before its final development. They focus on the user interface and user experience aspects, ensuring the website or application is functional, user-friendly, and visually appealing. Their roles include creating wireframes, prototypes, and layouts, coding using languages like HTML, CSS, and JavaScript, and testing the design for bugs. They also collaborate with backend developers to integrate server-side logic and often work with graphic designers to align with the brand aesthetics. They play a crucial role in user engagement and satisfaction.