Making their achievements all the more remarkable was that none had made a coffee before starting at McCafe between seven and 18 months ago.
McCafe regional manager and former champion barista John Kim saw their potential and trained them.
For three months they put in the hours, often practising past midnight and going through 3kg of coffee beans a night.
To help with the nerves, McDonald's Rotorua owners Rob and Linley Parry arranged three dummy runs, bringing in experts to give feedback.
"These guys are like rock stars here, they are very well respected within the group ... people came in and watched them practise," said Mr Parry.
It's the first time any McCafe baristas have medalled in the competition and a proud Mr Parry is now considering sending his stars to next year's world championships in Melbourne.
However for this quartet the main motivation is simple. "Making people happy with a coffee, especially when they have had a long day, makes me happy," Mr Baek said.