After moving up a weight class to bantamweight, his first international competition was the 2015 Indian Ocean Island Games in Réunion. He eliminated the local favorite, Jordan Rodriguez, before defeating Sitrakiniazina Rakotamanga of Madagascar in by way of unanimous decision (UD) for the surprise gold medal. A few weeks later, he suffered a first-round exit from the 2015 African Championships at the hands of eventual silver medallist Bilel Mhamdi. In 2016, he was not selected to compete at the African Olympic Qualification Tournament in Cameroon, but did become national champion for the first time. Vadamootoo won four straight fights at the 2017 African Championships in Brazzaville to take home the gold medal, becoming the first African bantamweight champion from Mauritius since Bruno Julie ten years before. He went on to make an appearance at the 2017 World Championships in Hamburg, losing to Mykola Butsenko in the first round. After a stint at lightweight, he made his return to bantamweight in time for the 2018 Commonwealth Games, where he lost his first bout by narrow decision to Moroke Mokhotho.