JavaScript is the primary programming language used by Airbnb for both front-end and back-end development.
On the front-end, Airbnb utilizes React.js, a popular JavaScript framework that enables the creation of dynamic and interactive user interfaces. React.js allows Airbnb to build reusable components and efficiently manage state changes, enhancing the overall user experience.
On the back-end, Airbnb has transitioned to a service-oriented architecture with various programming languages. However, JavaScript with Node.js remains a key component. Node.js provides a powerful runtime environment for executing JavaScript on the server side, enabling Airbnb to develop scalable, high-performance applications.