Robinson started playing rugby at Pentyrch RFC, made his professional debut aged 17 for the Cardiff Blues in January 2011. He spent much of the next season playing for Wales in the Sevens World Series, but caught the eye in the shorter form of the game was called up to the senior XVs squad in January 2012 before Six Nations despite having made just 4 senior appearances for the Cardiff Blues. He then went on to make his debut that June against the Barbarians where he scored a try.