What stacks would you recommend for starting a React Native application of low complexity (like single man operation) and low-to-moderate complexity (like a several man seed-funded company)?
Since you do probably need a server, I don't have an incredibly educated answer for you but I use Node + Mongo on AWS because it's cheap, easy, entirely JS, and seems like it'll scale reasonably well (to some point).
I'd err on the side of the latter (vanilla RN, Redux when you need it) to move fast on your product.