Drag and drop photo's on a google maps map

We would like to hire someone to create a mobile website with drag and drop photo's on a google maps map functionality. Front end: 1. Should be able to see their own location (geolocation) on the map. 2. There have to be customized markers/locations where the photos can be dropped on the map. 3. The photo's should stay on a certain location when the website is refreshed. Back end: 1. We should be able to add/change the photos. 2. We should be able to add/change the markers including location. 3. This can be done by changing the files so no administrator back end is needed, but documentation would be nice. Further information will be provided if necessary.