In 1997, Jarin coached the girls varsity team of Our Lord’s Grace Montessori High.
Jarin accepted to fill-in the post and won multiple UAAP juniors championships.
[1][2] One of his notable players was Chot Reyes' nephew Jai, who shot a dagger in 2003 Finals Game 1 win against Adamson Baby Falcons.
[7] He also served as an assistant coach for PBA teams like Talk 'N Text Tropang Texters and Meralco Bolts.
[10] Being the youngest of four children, Jarin completed his primary and high school education at San Beda.