JavaScript Developer JavaScript is a versatile programming language that is used to create interactive web pages, web applications, and mobile applications. JavaScript Developers are responsible for developing and maintaining JavaScript applications. They work with other developers to design and implement new features, troubleshoot and fix bugs, and stay up-to-date on the latest JavaScript technologies. The ideal candidate for a JavaScript Developer role will have experience with JavaScript frameworks such as React, Angular, or Vue. They will also have a strong understanding of JavaScript fundamentals, including object-oriented programming, event handling, and asynchronous programming.