An Ionic.io developer is responsible for developing and maintaining mobile applications using the Ionic Framework. This includes utilizing web technologies like , , and JavaScript, particularly AngularJS, to build cross-platform applications. The developer ensures optimal performance of the app on both Android and iOS platforms. They also integrate the applications with backend services, work on bug fixing and improving application performance. They keep up-to-date with the latest industry trends in mobile technologies, ensuring that the applications developed are future-proof and scalable. They also often collaborate with UI/UX designers to create user-friendly interfaces.