What is the difference between a web developer and web designer? A Web developer writes code to implement the design of the website, however, a web designer designs the visual look of the website, for instance, a designer works on layout, graphics, styles, etc. A web designer is mainly concerned with visual impact and user experience, where as a web developer works on the functionality and interactivity. A web developer is analytical, where as a designer is artistic. Designer works with HTML, CSS and JavaScript, where as a developer mainly works with PHP, .NET, Python, C, Ruby, etc.