Began his rugby career at Carmarthen Quins, making his debut at the age of 18 against Llanelli RFC. An integral part of the club's British & Irish and Anglo-Welsh Cup teams, the second row was capped by Wales at U18s and U20s. Josh enjoyed a breakthrough 2018-19 season with the Scarlets senior side, making 15 appearances and featuring regularly in the Guinness PRO14 and European Champions Cup.