This offer is way too high, but of course, I would not reject it :-)
I have the server side code, but it is old and cranky, and must be completely remade.
Please note that Supercell is very protective about their brand and software, and actively suppresses any attempt to steal their idea. Therefore, your game idea must be pretty different in order to not attract their attention.
I'm good only for the coding, the graphics must come from other sources.