Iordanis Konstantinidis began practicing taekwondo at the age of seven after discovering the sport through martial arts films.

In 2015, he won his first major medal at the international stage, a bronze at the European Junior Taekwondo Championships in Daugavpils.

[4] Konstantinidis started competing at the senior level in 2017, when he participated in the World Championships in Muju.

At the 2019 World Championships in Manchester, he beat Dominican athlete Bernardo Pié 12 to 9 in the quarter-finals and lost to China's Zhao Shuai 8 to 10 in the semi-finals to win a bronze medal in the men's 63 kg competition.

Konstantinidis participated in the 2023 World Championships in Baku, he won his latest international medal - a bronze - at the 2023 Albanian Open in Tirana.