What work front-end developers?

Front-end developers are often involved in the design of the websites they write code for, although some will just be working with mock-ups or wireframes. Front-end developers are the ones who will create the functionality of the website, the elements that will be displayed to the user, and the ways users can interact with the website. Front-end developers frequently work with Javascript and CSS, while some will work with HTML as well. It is important to know that front-end developers work with back-end developers as well.

Oh I was confued about the developer things, thanks Jorge Smith for clearifing, appreciable.

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