He attended Blackrock College where he was teammates with future Leinster hooker Gus McCarthy.
[3] He was a member of the Ireland U20 side which won the 2023 U20 Six Nations grand slam.
He was officially promoted to the Leinster senior squad ahead of the 2024-25 season.
[5][6] His older brother is fellow rugby union player Joe McCarthy.
[7] He studied global business at Trinity College Dublin on a sports scholarship.