Ovada born Farina officiated his first official match in 1979. He was 18 years old at the time.
Stefano Farina made his Serie A debut in 1995.
In 2001, after 7 years in the Italian Serie A, Farina finally received his FIFA badge.
In 2006 Farina refereed in Monaco the SuperCup final Barcelona-Sevilla.
Stefano finished his career in 2009 after 236 matches in Serie A. He then became director of 4th division (Serie D) referee commission.