A front-end developer designs and implements the user interface of a website or application. They use coding languages like HTML, CSS, and JavaScript to create visually appealing, responsive, and user-friendly websites. They ensure the site's design is optimized for various devices and browsers. Their work involves implementing design elements, creating site functionality, troubleshooting issues, and improving user experience. They collaborate with back-end developers to integrate server-side logic and often work with graphic designers for web design features. They also test, maintain, improve systems, and ensure website accessibility, performance, and capacity.