Antoniuk was born in Calgary, Alberta. In 2017, he participated in a training camp for the Canada U15 team and took part in the Canada Soccer 15 Showcase. The following year, he joined the Whitecaps FC Alberta Academy Centre and later transitioned to the official Whitecaps FC Academy.

In 2021, he became a member of the Vancouver Whitecaps FC U-23 team and trained with the first team. He signed a professional contract with Whitecaps FC 2 in March 2022 and made his debut later that month against Houston Dynamo 2. On April 10, he scored two goals, including a critical equalizer against Portland Timbers 2.

In July 2022, he was loaned to Atlético Ottawa in the Canadian Premier League. In 2024, he signed with Calgary Foothills FC in League1 Alberta, where he was the league’s top scorer with ten goals.

At the 2025 CPL–U Sports Draft, Antoniuk was selected by Cavalry FC in the second round. He signed a short-term contract to participate in CONCACAF Champions Cup matches and later secured a U Sports contract for the 2025 season, allowing him to maintain his university eligibility. He left the club in August 2025 to focus on academics while the club retained his rights for the 2026 season.