He was named to compete at the 2015 World Aquatics Championships in Kazan, Russia, where he won a bronze medal in the inaugural 4 × 100 m mixed freestyle relay.

At the 2018 Pan Pacific Championships in Tokyo, Kisil captured bronze in the 50 m freestyle, his first major individual international medal.

[10] Following this, he departed longtime coach Tom Johnson to train in Toronto with Ben Titley, after being disappointed with the times he had been recording in the 100 m.[11] 2019 saw the launch of the International Swimming League, a professional competition circuit for swimmers.

London Roar was one of the four team to reach the ISL's season finale in Las Vegas, where they finished in second place.

[14][15][16] He was part of Canada's team in the 4 × 100 m freestyle relay, who unexpectedly finished in fourth place despite not even being initially favoured to make the event final.