In January 2016, he joined FC Montreal, the second team of the Montreal Impact, in the USL.[5] He made his professional debut on April 10, 2016, in a 2–1 defeat to Toronto FC II. A month later, he scored his professional goal against Bethlehem Steel FC on May 15.[6]
On June 8, 2016, he made his debut for the Montreal Impact in a 2016 Canadian Championship match against Toronto FC.[6] On June 28, 2016, he officially signed a professional contract with the Impact.[7][8] He became the first player to sign a first team contract, after having played for the second team.[9] In October 2016, Choinière made his MLS debut against the New England Revolution.[10] In January 2017, he suffered an ankle injury, which caused him to miss the beginning of the season, returning in April.[11] He scored his first goal for the Impact on May 30, 2017, in a Canadian Championship semi-final match.[12][13] After making one appearance in the 2018 season, he would miss 6 months after having surgery on his ankle in April 2018, after having only played three game the previous season due to the same injury.[14][15] After the 2018 season, Choinière declined a one-year contract extension and departed the club.[16]
In March 2019, he joined Forge FC in the Canadian Premier League.[17] Choinière scored his first goal for Forge on August 1, 2019, a late winner to make the score 2–1 at home in the preliminary round of the 2019 CONCACAF League against Guatemalan club Antigua GFC, which made Forge the first CPL club to ever win a match in a CONCACAF competition.[18][19] He helped Forge win the CPL title in 2019, scoring the only goal in the second leg on November 2, 2019, against Cavalry FC.[20][21] In February 2021, he signed an extension with the club.[22] He was named CPL Player of the Month for October 2022.[23][24] In 2022, he won his third CPL title with the club,[25] scoring the second goal in a 2–0 victory in the championship match.[26] In January 2023, Choinière signed a new multi-year deal to remain with Forge.[27][28] In October of the same year, he helped Forge win their fourth league title, following a 2–1 win over Cavalry FC in the play-off final.[29]
International career
He made his debut in the Canadian youth program in 2012 with the Canada U15 team at the Copa de México de Naciones.[30]
In September 2017, Choinière received his first Canadian senior team call-up for a friendly against Jamaica, but did not feature in the match.[32]
Personal life
Choinière's younger brother Mathieu is also a soccer player.[33][34] They faced each other for the first time in a 2022 Canadian Championship match between Forge and CF Montreal,[35] and subsequently played against each other in the 2023 and 2024 editions as well.[36] He is of Filipino descent through his mother.[37]