A Caliburn developer works with Caliburn.Micro, a small, yet powerful framework designed for building applications across all XAML platforms. Their tasks include creating scalable, testable applications, employing MVVM (Model-View-ViewModel) pattern, and facilitating UI actions, data binding, and dependency injection. They are responsible for designing and developing user interfaces, debugging and resolving technical issues, and ensuring software performance optimization. They also collaborate with other team members to integrate components and systems together. Their role may also involve providing technical guidance, supporting system updates, and maintaining the overall quality of applications.