A web designer developer combines the responsibilities of a website designer and a website programmer into an all-inclusive position. In this role, your duties are to design a website by planning its overall concept, from its color scheme to its layout, and then develop the site by writing the code that makes your design come to fruition online. To become a web designer developer, you need expert knowledge of website coding languages like HTML, CSS, and PHP as well as design and graphics-making skills using programs like Adobe Photoshop. Web designer developers may work part-time or full-time for organizations to create and maintain their websites, or they can work on a freelance basis designing and coding websites for clients.