It's not necessarily based on your title. When I went through the process, it boils down to:
- Do you have a degree, and experience? Great. Is someone willing to advertise the job to American citizens for a month or so, interview good potential candidates beforehand, and still want you? Even better. Now, just wait for next year's allocation of visa's and you might grab one on the day they're released. Then, wait between 1 and 8 years for your visa to be processed (while the job is still available) and you're allowed to work here.
- Are you an exceptional alien? Well, do you judge other's work, have papers written, have competed in a globally recognised event for your work, or some other proof of your excellence? Yes? Great, we can apply, but there's only a limited number of visas. Wait a year.
It's really, really tough. Not many of us make it. I had a few job offers moving over here but was only able to move here because my wife was American. And getting her back to the UK is also no easy feat.
Despite being globally connected the visa process still sucks.