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. A web developer's job is to create websites. While their primary role is to ensure the website is visually appealing and easy to navigate, many web developers are also responsible for the website's performance and capacity.Web developers create and maintain websites. They are also responsible for the site's technical aspects, such as its performance and capacity, which are measures of a website's speed and how much traffic the site can handle. In addition, web developers may create content for the site.