Ask HN: What's the best way to get a code review of my Rails app?

I'm building my first app using Rails. I'm making a number of design decisions that I'd like to have reviewed by someone with experience. For instance, have I put business logic and configuration in the right places; am I calling external services properly; what have I done that's going to haunt me after I launch?

I can search individually for guidance on these topics, but I'd like a holistic look at my app. Any suggestions or recommended resources?