In my own experience (as a non-eng)- if you want to get a job at a startup outside of the engineering roles, you need to be a lot more proactive. That means emailing companies that you find interesting, and telling them why you find them interesting (do not send the same cover letter to every company without any mention of why you like their company - that's what people on craigslist do, and that's why a lot of companies are forced to use a jobvite/etc system).

Most startups have non-eng needs but don't know they need them until after they're hurting pretty bad. I've had the most success applying to companies (instead of jobs) - tell them what you're good at and why you like their product - if they think there's a fit, they'll get back to you. By applying to companies this way, you also manage to avoid a lot of the potential competition you'd have for the job once a formal job req/post has been generated (no one else even knows the job exists, because you just sent in your stuff and asked them to respond if they think there's a fit).

Do keep in mind - the more hype the startup has gotten, the more generic cover letters/resumes they get - so find a way to stand out, and understand it's a numbers game! Lucky for you, there's tons of startups that need great people in SV, so if you play the game enough, you'll get a job with an awesome company.

Good luck!