A temporary business visit under visa waiver or one of the B categories does not, as far as I'm aware, allow you to "work" except under certain circumstances.
Meetings, sales calls, repairs, market research, and similar activities are not considered "work" and are allowed. It would need to be investigated whether R&D (which, effectively, is what you're doing when working on a YC project) is allowed.
If you're working in the country already it's unlikely you can use that. I tried to switch to a tourist visa after leaving my job (was on a TN). Denied - they said that I failed to reestablish residency in the foreign country.
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http://germany.usembassy.gov/germany/visa/vwp.html
There's a large list of countries for which a stay of up to 90 days for business or tourism does not require a visa.
A temporary business visit under visa waiver or one of the B categories does not, as far as I'm aware, allow you to "work" except under certain circumstances.
Meetings, sales calls, repairs, market research, and similar activities are not considered "work" and are allowed. It would need to be investigated whether R&D (which, effectively, is what you're doing when working on a YC project) is allowed.
There's a pretty good list here of what's allowed and not allowed:
http://vkvisalaw.wordpress.com/2008/02/23/what-“business”-ca...
If you're working in the country already it's unlikely you can use that. I tried to switch to a tourist visa after leaving my job (was on a TN). Denied - they said that I failed to reestablish residency in the foreign country.
Yes, in the posters case it's probably not useful, however it might be for other readers.
That's a very small list of countries. Large, no!