A Firebase developer builds and maintains applications using Google's Firebase platform. They integrate various Firebase services like Firestore, Firebase Authentication, Cloud Functions, and Firebase Analytics into applications for efficient backend operations. They design and secure databases, manage user authentication, generate useful analytics, and ensure real-time updates across devices. They also monitor app performance, troubleshoot and fix bugs, and optimize app responsiveness. Firebase developers work closely with frontend developers and UI/UX designers to create seamless user experiences. They need to stay updated with the latest Firebase updates, as well as understand the specific requirements of each project.