From experience: Be extremely articulate on what you want regarding features, implementation language, how/where the core should run and so forth. Don't accep

From experience: Be extremely articulate on what you want regarding features, implementation language, how/where the core should run and so forth. Don't accept offers to work outside of the RAC structure until you have a good working relationship with a particular developer. Communicate frequently, at least every other day on progress and updates. Test EVERYTHING. If at all possible, have some comparison site in mind. It's easier for someone to code something like Y, vs. creating an entirely new concept from scratch.