That being said, most of the tech is centralized in just a few shops. Everything is contracted out to Datacom, Catalyst, Frondie, Solnet, etc. etc.
I mean companies do have their own IT staff, but just due to the shortage of talent, a lot gets contracted out, including tons of government stuff.
If you're under 30 and a US citizen, you can get a Holiday Work Visa and live/work there for a year. (This is how I started out, before switching to another visa). If you're a citizen of a commonwealth state, I think you can get a two year visa to most other commonwealth countries (including AU/NZ).
Oh and Wellington is the windiest city in the world. This is not an exaggeration. Oh and expect at least one earthquake a year too.