> how's the dev job market there ?

There was a time when Cardiff used to be have quite a lively startup scene. Today though you'd be very lucky to find tech work. If you do it will be poorly paid.

Why do you ask? If you're not from the UK I'd highly advise not considering coming here. Economy is terrible, taxes are ridiculous, everything is extremely expensive, terrible weather, social unrest, poor transportation, etc... Most people with sense are trying to get the hell out.