[2] He signed his first professional contract in August 2019 and made his debut for Kent later the same month in a 2019 t20 Blast match against Surrey at Canterbury.

[3][4] He made his first-class debut for Kent in a County Championship match against Nottinghamshire at Nottingham on 10 September 2019.

He trained with Northern Knights and played for the Irish Senior Academy side during the team's tour of England in April 2019 before being called back by Kent where he had been part of the county's Cricket Academy for the previous seven years.

[2] During the 2019/20 northern winter O'Riordan played New South Wales Grade cricket for Belmont.

[12][13] He made his List A debut on 22 July 2021 in the 2021 Royal London One-Day Cup.