The firm spent 18 months based at the Kiwi Landing Pad, a business support centre in San Francisco, before setting up its own office in the Californian city in September.
"If we had not opened the office there we would not have this business or a lot of the other business that we're getting in the United States at the moment," Farmer said.
Mako, whose revenue reportedly reached $10 million last year, announced another deal with US payment service provider Aperia Solutions in July.
The company has 90 staff worldwide, including 75 in New Zealand at its customer support and research centre on the North Shore.
Eighty per cent of the company is owned by its founders - Farmer, Chris Massam, Dennis Monks and Simon Gamble.
Mako global communications director Kevin Ptak said the firm was not planning a sharemarket listing.
The firm's customers in New Zealand include Telecom and the Ministry of Health.