Fe'aunati was born in Wellington, New Zealand. In September 1995 he joined Melrose, debuting for the club in their 31-3 home victory over Hawick on 13 September 1995.
He retired from professional rugby in 2008 to take up a coaching position at Bishop Vesey's Grammar School on 2 June 2008. He also played Jonah Lomu in the 2009 film Invictus.
In July 2014, Fe'aunati stepped down from his position as Director of Rugby at Bishop Vesey's Grammar School to return with his family to New Zealand.