Front-end developers are responsible for creating the user-facing portion of websites and applications using HTML, CSS, and JavaScript. They work closely with designers and back-end developers to ensure that the final product is visually appealing, user-friendly, and functional. Services include website and application development, responsive design, user experience design, and maintenance/updating of websites and applications. Front-end developers require technical skills, problem-solving abilities, and an eye for detail to create intuitive solutions for potential user issues.