Canberra's Sasa Sestic has won the World Barista Championship title in Seattle, making the ACT home to the world's best brew.

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Mr Sestic earned his place in the final after winning the Australian titles in Melbourne last month.

The long-time Canberra resident who runs Ona Coffee told 666 ABC Canberra preparation started more than 12 months ago on a farm in Columbia.

"I do work with a lot of different countries worldwide. I look at a barista competition to see when it's going to be held.

"I've looked at a calendar and seen when coffee will ripen in each country.

"Seasonality is very important and we knew that the season would finish in Colombia from September to October.

"Just like fruit and vegetables, when they're in season they taste great. It's the same thing with coffee."

It is the first time Mr Sestic has represented Australia at the world championship. He won the Australian title on his seventh attempt.

Mr Sestic won the world title ahead of US champion Charles Babinski and Canadian Ben Put.

The competition had sensory judges, technical judges and a head judge, who assessed 12 samples from competing baristas.

"We had to serve four espressos, four cappuccinos and four signature drinks," Mr Sestic said.

"For the signature drinks, coffee obviously needs to be a star, but we would add ingredients, not to mask coffee but to highlight the qualities of the coffee as well."