A Fuel PHP developer designs, develops, and manages applications using the FuelPHP framework, a flexible, full-stack PHP framework that follows the MVC (Model-View-Controller) pattern. They write server-side web application logic, integrate the application with other web services, and support the front-end developers by integrating their work with the application. They also work on the maintenance and optimization of existing systems. They ensure the responsiveness and efficiency of applications, troubleshoot and debug applications, provide user support, and keep abreast of new trends and best practices in web development. They may also be involved in database design and management.