I was lucky enough to get a startup to sponsor my H1B. It was a big investment for them since I'd cost them a large chunk of money and time before I'd written a single line of code. You spend most of the process feeling guilty for taking time from extremely busy people's days to go through huge email discussions with lawyers and filling out forms. When you actually land at the company people will wonder why so much time and effort was taken to ship someone in from abroad rather than hiring locally.
From the employee side there's also risk, while you can switch jobs on an H1B it's not trivial and startups have a tendency to go under (luckily my current employer is kicking ass so my chances of an unemployment related deportation are very close to 0 but it still worries me at times). Having your company go under is never fun, that coupled with facing a deadline to find another job with visa related friction slowing the process down is not something I'd like to try.
On the upside working for a US startup is an amazing experience. Ireland has some hardy souls trying startups but it's like another planet over here. A lot more energy and enthusiasm around starting something new and people don't treat startups like a last ditch attempt at employment which is nice.
From the employee side there's also risk, while you can switch jobs on an H1B it's not trivial and startups have a tendency to go under (luckily my current employer is kicking ass so my chances of an unemployment related deportation are very close to 0 but it still worries me at times). Having your company go under is never fun, that coupled with facing a deadline to find another job with visa related friction slowing the process down is not something I'd like to try.
On the upside working for a US startup is an amazing experience. Ireland has some hardy souls trying startups but it's like another planet over here. A lot more energy and enthusiasm around starting something new and people don't treat startups like a last ditch attempt at employment which is nice.