If you are a "senior-level" programmer (ie you have a bunch of experience and have shipped products) one possibility is to make contact with a SV consulting company for subcontracting to larger enterprises. Such is the dearth of talent that big, boring companies can't find anybody and end up hiring a lot of H1Bs and contractors. Going with a contracting company rather than contracting yourself directly has several advantages, like you don't have to buy your own insurance (can be very expensive) or incorporate, if you don't want to.

A caveat is that you'll almost certainly be working with Java rather than iOS, but not necessarily. Just get your name out there and talk to a few places.

I know this approach works because it's what I did. I don't even live in the US (western Canada) and it's worked out fine. I have to fly down and hang with the client once a quarter and that's about it.