Mullins was part of the Irish U20 side that won a grand slam at the
2022 Six Nations Under 20s Championship. In 2022, he was included in the
Emerging Ireland squad for the
Toyota Challenge. Later in the year he joined up with the
Ireland national rugby sevens team and was part of the bronze medal-winning squad at the
Rugby Sevens World Cup in September 2022 in South Africa. He continued to be part of the Ireland 7s during the 2023
SVNS series. Mullins scored 2 tries in Pool game against
Japan and Quarter-Final match against
Fiji. ==Personal life==