Mitchell won back-to-back U18 Ontario Curling Championships in 2017 and 2018 as a member of the Hazen Enman and Joshua Leung rinks respectively.

[8] Mitchell then moved back to Ontario the following year and formed his own rink with Landan Rooney, Nathan Steele and Austin Snyder.

In December 2021, Team Mitchell won the cash spiel qualifier for the 2022 Ontario Tankard, sending them to their first provincial men's championship.

They then lost the semifinal to Germany's Benny Kapp, but bounced back to beat Norway's Grunde Buraas to claim the bronze medal.

[18] While competing with Rooney's junior rink, Mitchell and Steele were also playing on tour with their men's team of Sam Mooibroek and Colin Schnurr.

[22] With their points accumulated from the past season, the team qualified for the 2023 Tour Challenge Tier 2 Grand Slam event where they finished 1–3.

[24] They also qualified through the A event of the 2023 Western Showdown after defeating world number five ranked Yannick Schwaller but were then taken out by the Swiss team in the quarterfinals.

[25] Entering the 2024 Ontario Tankard as the top ranked team, the Mooibroek rink lost all three qualifying matches in the triple knockout and were eliminated before the playoffs.

[32] In the final, they defeated the defending champion Scott Howard 7–4, earning the right to represent Ontario at the 2025 Montana's Brier in Kelowna, British Columbia.