An AngularFire developer primarily integrates Firebase into AngularJS applications, enabling robust database management, user authentication, and cloud services. They develop real-time, scalable applications by leveraging Firebase's NoSQL database for data storage, retrieval, and synchronization across multiple clients. They handle user authentication using various providers, including Google, Facebook, and Twitter. Additionally, they manage cloud functions, push notifications, and storage capabilities, enhancing app functionality. AngularFire developers also ensure data security by implementing Firebase's security rules. Their role involves constant code testing and debugging to ensure optimal performance and user experience.