[1] He played youth soccer with Vaughan Azzurri and helped them win the League1 Ontario U19 Reserve Division in 2022.
[9] In March 2023, Stewart-Baynes signed a developmental contract with the HFX Wanderers of the Canadian Premier League.
[1][10] In December 2023 ahead of the 2024 MLS SuperDraft, Stewart-Baynes signed a Generation Adidas contract with Major League Soccer.
[13][14] Stewart-Baynes made his professional debut in MLS Next Pro for Colorado Rapids 2 on March 17 against St. Louis City 2.
[15] On March 23, he made his MLS debut against the Houston Dynamo, entering as a late substitute in an eventual 1-0 defeat.