Rooney and teammates Matthew Prenevost, Kevin Genjaga, Benjamin Lobo competed in the 2019 Ontario U-21 Curling Championships, finishing with a 3–4 record.

[4] The following year, Rooney with new teammates Gavin Lydiate, Christopher Oka and Riley Fung-Ernst returned to the Ontario U-21, finishing with a 4–3 record.

The event was held as a replacement tournament for the Canadian Junior Curling Championships, which were cancelled due to the COVID-19 pandemic in Canada.

[7] Rooney and his rink of Nathan Steele, Jacob Jones and Austin Snyder won the 2022 Canadian Junior Curling Championships, defeating Alberta's Johnson Tao in the final.

They finished the Canadian Juniors Round-Robin with a 7–1 record, and then won all three of their playoff games to win the Championships.