ArcMap Add-In Development

I am looking for an ArcGIS developer to develop ArcMap add-in. The add-in need to assist in the following: I am having two polygon feature-classes, Source FC (A) and Target FC (B). Having both feature classes opened in ArcMap, the add-in shall allow the user to first select a polygon from Sourc FC and then select a polygon from Target FC. Then by right click in the map, the Add-In shall replace the selected polygon in Target FC with the polygon selected from the Source FC but keep the existing attributes in the selected polygon from Target FC. So, only the Geometry from the Source FC selected polygon will be used to replace the Geometry of the Target FC selected polygon.