How much does it cost to hire some devs to finish my job?

I work with operations at a VC firm and we started developing an in-house solution to manage our funds and investments.

I am no professional developer, I am a finance guy, and right now I am stuck. I can't manage my amateur codebase anymore nor develop it further.

It is written in Rails, so my question is, how much does it cost to have 2-3 developers finish it in 2-3 months?