A Node.js developer works with Node, an open-source developer’s tool that focuses on server-side functionality for websites. As a Node.js developer, your duties include coding, debugging, and coordinating with programmers who focus on the front end. The front end refers to the browser, while the back end refers to the server. As a Node.js developer, your responsibilities involve keeping up-to-date on the latest software updates and how they pertain to your site’s function. The JS suffix refers to JavaScript, a programming language that you must also know.