The Olympic gold medalist played league in Fiji until 17 years of age, before switching to rugby union six years ago.
He debuted for the Fijian sevens side last season and was part of their gold medal winning team in Rio.
The 23 year old arrived in Canberra on Sunday and trained with his new teammates for the first time.
"There's so many good players here and I'm going to be able to learn a lot off them," he said.
Raiders Recruitment and High Performance Manager Peter Mulholland was excited at the talent and potential of Dakuwaqa.