He explained the challenges of automating large industrial machines with electronics and software, and outlined the hiring process in the industry.
He stressed the demand for engineering graduates with practical experience, whether from the Bachelor of Engineering degree or the NZDE diploma.
Raymond and Aaron are both "ambassadors" for FutureInTech, an Institute of Professional Engineers New Zealand (IPENZ) initiative that is also aimed at getting more school students into technology, engineering and science.
The teachers were excited to see how engineering was applied in the industry.
Haggis Henderson, from Whangarei Boys High School, said: "Engineering is just science and mathematics put to work, and it is great to see people solving problems and earning a living applying those ideas."
Phil Buchanan, from Excellere College, said he was very pleased to get up-to-date information about the flexible pathways into engineering, and local opportunities for students to train without building student debt.
Other teachers taking part in the day represented Whangarei Girls High School, Kaitaia College and Te Kapehu Whetu.