He is the current head coach for Aris of the Greek Basketball League (GBL) and the EuroCup.
Arkadias, Arkadikos and Panachaiki before starting his basketball coaching career as an assistant in Apoloniada.
[2] Kastritis led the team to the best season of their history, as they finished in 10th place in the league, with a 10–16 record.
[3] On November 25, 2018, Kastritis resigned from his position, after a string of negative results, and despite his successful 2017–18 campaign with the club.
Kastritis was the head coach of the Greek Under-19 national team, at the 2019 FIBA Under-19 World Cup, in which Greece finished in 10th place.