NZ has a variety of different sized software companies, most of whom were hiring at the start of the year so will resume hiring if Covid doesn't kill their customers. Look at: xero.com, vendhq.com, asktimely.com, soulmachines.com for a start.
NZ has a number of agtech businesses (Halter, for example) doing techy things in the agriculture/horticulture space. Attend Fieldays to see what's going on there: https://www.fieldaysonline.co.nz/
And there's a mixture of other high-tech (e.g., RocketLab) with a solid backbone of niche weird engineering businesses that seem to do well here.
For a "full" (or, at least, substantial) list of NZ startups, visit: https://new-zealand.globalfinder.org/
Auckland and Wellington are the big dogs. RocketLab is off the Mahia peninsula on the east coast. Halter and AgTech tend to be Hamilton or Palmerston North. Dunedin has some software businesses, Christchurch has some engineering ones.
Everyone speaking English is deceptive! I moved back after 10 years away and it was a bit of a culture shock after America: Kiwis are British and tend to avoid conflict until they explode, and don't like to say "no" to your face (though it's not as strong as in some Asian cultures), so come across as passive-aggressive to Americans. Vice-versa, Americans can come across as loud and aggressive because they dive straight to the point. Read https://ask.metafilter.com/55153/Whats-the-middle-ground-bet... and you'll get be able to adapt. Allow a year of bumpiness before you start to figure things out.
Salaries in software let you live well, and you could save. You could earn NZD100k+ and spend NZD60k living comfortably but not in luxury or travelling internationally. Salaries in some other forms of tech (bio) are more meh (NZD60k+). See seek.co.nz (jobs site) and the jobs section of trademe.co.nz to see what's available.