Born in Christchurch, New Zealand, Tevaga is of Samoan, Maori and European descent. Tevaga played his junior football for the Burnham Chevaliers in Christchurch and Papakura Sea Eagles in Auckland and he attended Papakura High School, where he played in the 2013 National Secondary School...
After playing his junior football with the Northcote Tigers, David was brought into the Vodafone Warriors' development programme. On the back of an impressive showing in the 2012 trials he won a place in the club's NYC squad, making his debut for the Vodafone Junior Warriors in the first round...
did not debut for the warriors