A Frontend Web Developer designs and implements the user interface of a website. They use languages like HTML, CSS, JavaScript, and tools such as React or AngularJS to create visually appealing and user-friendly websites. They ensure the site's design is optimized for various devices and browsers. Developers also work with UX/UI designers to bring their designs to life, and with backend developers to ensure the website's functionality aligns with the frontend design. They also conduct tests to identify bugs, improve performance, and maintain the overall visual and functional health of the website.