Great answers. Just remember when you compartmentalize people you may end of with people sitting around doing nothing or even worse people doing nothing while pretending to be doing something worthwhile on your time and on your dime. I would hire Full Stack Developers only and outsource everything else. You will probably know when you need to add more staff and other positions. The key is to hold everyone accountable whether they are sitting in-house or "outhouse" (out sourced).
Michael T. Irvin
NoHogWashMarketing.com
michaelirvin.net