Wainwright began his career at local club Rhyl and District RFC before joining the North Wales regional side RGC 1404.
[2] Wainwright signed a contract extension with the Scarlets on 20 April 2023, along with fellow prop Kemsley Mathias.
He received his first call-up to the senior Wales side in June 2022, when he was added to the squad for the summer tour to South Africa in place of the injured Leon Brown.
[4] Wainwright came off the bench in the second test to make his debut, with Wales winning for the first time on South African soil.
Wainwright was selected in the Wales squad for the 2022 end-of-year rugby union internationals, and came off the bench against Georgia.