Hi Tompano,
I'd give this URL below a go -
http://www.airways.co.nz/about_Airways/careers.asp
Airways Corporation is the sole ATS provider for NZ domestic and the NZ Oceanic FIR as well as carrying out quite a bit of international work and consultancy.
I've no idea what the NZ Government needs as far as residency and such forth goes, but an email to Pauline McIntrye in the HR department,
[email protected]
sould get you any answers you need.
Good luck