A front-end web developer is a person who performs web designs by coding languages like HTML, CSS, and JavaScript. Though it’s not as simple anymore, front-end developers are sometimes called “client-side developers” to differentiate them from back-end developers who program what continues behind the scenes (like databases). 

If you head to any site, you can see the work of a front-end developer everywhere—in the navigation, layouts including this article page, even the way that a site seems distinct from your phone (thanks to mobile-first or responsive design).