Instead of looking at who does what .. why not look at the things that need to get done for a small techology team.

Product: 6 people
- 3 full stack engineers
- 2 front end developers
- 1 designer / product person

Marketing & Community, 1 person
- Full time hire, or CEO

Support & Operations, 1 person
- Part time hire, or CEO + Whole team

I believe it's important for everyone on the team to help with support. Also, if you have a great product, then support shouldn't be that taxing.

Q&A is usually needed when you have a bad development process (no unit testing or continuous integration deployments).

Outsource everything else.
- Bookeeping
- HR stuff
- Legal
- Government program paperwork

Hope that helps.

P.S. I would put as many people on product as that's where you'll get the most bang for your buck.