Develops user interfaces for web applications using React.js, ensuring that they are responsive, user-friendly, and visually appealing. Responsibilities include writing clean and efficient code, optimizing applications for maximum speed, and collaborating with back-end developers to integrate APIs. The front-end developer also tests and debugs code, implements UI/UX designs, and stays updated with the latest front-end technologies and trends. This role requires strong React.js skills, knowledge of front-end development, and attention to detail.