Hey, Mathbreakers is DEFINITELY interested. I've been talking about the need for this for a while. Perks: Work for a revolutionary math video game startup! :-]
Send me a note at charlie@mathbreakers.com if you're still available. We're in Mountain View and Redwood City, and will be in SF starting September.
ZenPayroll is looking for an EA to the CEO: http://boards.greenhouse.io/zenpayroll/jobs/8618#.U81VG4BdXw...
You should join them!
We're a lean team located in Palo Alto. Send me an email if you'd like to learn more ed.castano at bluevine dot com.
How many replies did you get? If you're doing this for free, you could also help out Techstars in their associate program.
where is your location? or are you willing to travel?
Have you thought about just applying to jobs at startups? I don't understand your point of working for free. Its an "awkward" situation IMO for a business, where it would be more practical to just get a job doing whatever it is you would like.