If you want to work in New Zealand you must apply in advance for a Work Visa. The Work in New Zealand(external link) section of the New Zealand Immigration website contains comprehensive information about the options available including:
New Zealand - Working Holiday Schemes
Working Holiday Schemes (WHS) exist between New Zealand and Austria, Slovakia, Hungary and Slovenia. These schemes allow young people to combine holiday making with working and/or studying in New Zealand.
- Further information regarding the details of WHS can be found here(external link).