Aaron Bingham, who co-owns the Mill Lane business with Raelene Rankin and Beverley Naylor, said a lot came down to Mr Greig's skill.
They sourced their beans from South and Central America, Indonesia, East Timor and Africa, including some "pretty special" beans from Ethiopia, and used an "ancient" roaster made in Austria in the 1950s.
The recognition would be a boost for the company and the 21 cafes between Taupo and Kaitaia serving Max coffee, he said, while he was grateful to "all the people who buy our coffee, our cafes and believers."
Max Coffee has three full-time and three part-time staff, who were planning to celebrate with champagne and scallops.
Mr Greig, who previously owned the Sugar Boat restaurant at Waitangi, said Max customers were passionate about coffee.
"You're making something people love, so it's a pretty positive experience," he said.
The firm was founded in 1999 by Ben Lawrence, who originally did the roasting at home in Kerikeri. The company now produces more than a tonne a month.
Max Coffee is also available at supermarkets in Northland and Auckland, as well as two cafes in Fiji.
Eighty companies entered 313 coffees in the awards, which were judged by a panel of 12 experts, Max Coffee winning gold with Max Morning Blend (best supermarket plunger), silver with Max Organic Blend (best ethically traded) and Max Exotic Blend (best supermarket espresso), and bronze with Max #1 Organic Blend (best organic) and Max #7 Yirgacheffe Single Origin (best single origin).
The only other Northland winner was Rush Coffee from Wellsford, which won bronze in the supermarket espresso category.