A MapKit developer utilizes Apple's MapKit framework to integrate maps into iOS applications. They create interactive, customizable map interfaces with features like annotations, overlays, and precise navigation. They also manage location data, monitor user location, and generate directions for routes. A MapKit developer often collaborates with UI/UX designers for creating user-friendly map experiences. They ensure the map features work across different iOS devices and troubleshoot any issues related to map functionalities. Their work is crucial in building apps for travel, logistics, real estate, and other sectors that rely heavily on geolocation services.