Mandziy's first World Cup season was the 2008–09 season. He finished in his first World Cup race 46th in Igls, Austria. As of February 2022, Madziy's best personal World Cup finish was 14th during the 2020–21 season in the men's singles event held in Winterberg, Germany.[2]
On December 27, 2017, Mandziy qualified for the 2018 Winter Olympics.[3][4] At the Olympics, he was 40th in the singles' race due to losing control over his luge during the first race.