I have no inside info, but my guess is probably not. Unless we're talking about AirBnB or Dropbox, most YC companies aren't going to want to take the time out to deal with the regulator¥ hassles of H1B sponsorship.
That said, for the perfect candidate, exceptions will be made.
Are you speaking from experience? I've found the TN process really confusing for an intern, and if you have any experience with the application process, I'd love to hear about it.
Yes. Get the company's lawyer can fill out the paperwork for you and you show up at the airport with the paperwork and receive a visa. You can't apply in general for a TN, it is company specific.
Same question here. From my friends who interned at Amazon, Facebook etc. the visa seemed pretty easy to get (we're Canadians), but those are bigger companies, not sure if the same applies to YC startups?
That said, for the perfect candidate, exceptions will be made.