A Google Maps Engine developer designs, builds and maintains applications using the Google Maps Engine. They utilize Google's comprehensive set of mapping tools and services to create location-based applications, integrating data visualization, geolocation features, and location-based analytics. They leverage APIs to customize and add functionality, such as layering data, creating heat maps, or plotting routes. The developer ensures that the maps are responsive and user-friendly, and often work with other developers or stakeholders to integrate the maps into larger systems or applications. They also troubleshoot issues, optimize performance, and stay updated with the latest Google Maps technologies.