Improve system performance by resolving coding errors or server slowdowns. Execute scripts for new applications with the help of ASP.NET or analogous programming languages. To evaluate apps before they are promoted to users, create prototypes of the applications. NET developer should have skills of creating highly creative, catchy and interactive web applications. This increases his value in the market. In order to achieve that, understanding of client side technologies like HTML, CSS and JavaScript, jQuery and Bootstrap is a necessity.