A Web Developer is a professional who is responsible for the design and construction of websites. They ensure that sites meet user expectations by ensuring they look good, run smoothly and offer easy access points with no loading issues between pages or error messages. Web developers create functional, user-friendly websites and web applications. They may write code, develop and test new applications, or monitor site performance and traffic. Front-end developers focus on the user-facing side of their work, while back-end developers make websites functional and secure.