Cordina won the lightweight gold medal at the 2015 European Amateur Boxing Championships in Samokov, Bulgaria, beating Otan Eranosyan of Georgia in the final. He was the only British boxer to win a gold medal at the event. At the 2015 AIBA World Boxing Championships held in Doha, Qatar, he reached the quarterfinals of the lightweight division by beating Kwon Chol-guk of North Korea in the round of 16, but was then eliminated after losing to Robson Conceição of Brazil.