Defence Science & Technology is listed as an association or organisation at Devonport Naval Base, HMNZS Philomel, 40 Queens Parade, Devonport, Auckland 0624, with a Google rating of 4.4. Its listing links to the New Zealand Defence Force careers website.
According to that website, the NZDF has over 100 roles across the Army, Navy and Air Force, with examples such as combat specialists, aircraft systems technicians, avionics technicians, chefs, naval police, physical training instructors and hydrographic systems operators. The site says recruitment is thorough, and that the NZDF holds events across the country, including information evenings, where you can ask personnel questions in person. It also says recruitment of Naval Reserve candidates is paused for now. You can search roles by keyword on the site, and use its contact form with questions.
For people in Devonport and across Auckland who are thinking about a career in the defence forces, the NZDF careers website is the place to start.