[ig1]

For the UK you can get a Tier-1 visa which operates on a points based system (if you google you can figure out for yourself if you get enough points to qualify), unfortunately they've introduced a quota system this year which makes it slightly trickier. Still you have a decent chance of getting one.

The advantage of the tier-1 visa is that it doesn't tie you to a particular employer, your free to work for whoever you want as long as your salary meets a minimum level. It also means you can apply to any tech company without having to worry about if they'd be willing to sponsor you, etc.

The financial sector in London is a huge employer of developers and if your looking for hardcore CS stuff might be a good place to look, and most banks are happy to sort out visa stuff on your behalf because they have whole teams dedicated to that stuff.

Most of the UK tech job boards are dominated by recruiters, so your best bet might just be finding some tech company you're interested in and looking at their homepage for job opportunities.

I'm currently in the process of launching a developer job board for the UK (http://www.coderstack.co.uk), but it's still very early days so I don't have very many job listings at the moment.