Juniors 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. Participating in the newly created
Canadian U18 Curling Championships, Mitchell and his team just missed the playoffs at the
2017 Canadian U18 Curling Championships with a 4–4 record, placing fifth. The following year at the
2018 Canadian U18 Curling Championships, his team did not fare much better, being eliminated with a 3–4 record in seventh place. After aging out of U18s, Mitchell began attending
Cambrian College in
Sudbury and joined the
Jacob Horgan rink at third. With Horgan and front-end players
Mitchell Cortello and
Chase Dusessoy, the team won the Northern Ontario junior provincial, sending them to the
2020 Canadian Junior Curling Championships in
Langley,
British Columbia. There, the team missed the playoffs with a 2–4 record and finished eleventh after a 1–2 record in the seeding pool. For the
2020–21 season, Mitchell moved east to join the
Graeme Weagle rink out of
Halifax, Nova Scotia. Due to the
COVID-19 pandemic, both the Nova Scotia and Canadian junior championships were cancelled. Mitchell then moved back to Ontario the following year and formed his own rink with
Landan Rooney,
Nathan Steele and
Austin Snyder. This team was selected to compete at the
2021 World Junior Qualification Event which was held as a replacement to the junior championship. There, they finished 4–1 in the round robin to earn a bye to the semifinals where they lost to Newfoundland and Labrador's
Nathan Young. In December 2021, Team Mitchell won the cash spiel qualifier for the
2022 Ontario Tankard, sending them to their first provincial men's championship. There, they finished 3–3 and fell short of reaching the playoffs. Later that season, Rooney took over as skip of the team and won the
Ontario U-21 Curling Championships, qualifying the team for the
2022 Canadian Junior Curling Championships where Mitchell joined them as their alternate. There, the team finished 7–1 through the round robin and won all three of their playoff games to win the Canadian championship. This earned them the right to represent Canada at the
2023 World Junior Curling Championships the following year. Before this, however, Mitchell joined the
Owen Purcell rink as their alternate for the
2022 World Junior Curling Championships in May 2022. Through the round robin, the team finished with a 6–3 record to earn a playoff berth. They then lost the semifinal to Germany's
Benny Kapp, but bounced back to beat Norway's
Grunde Buraas to claim the bronze medal. With Steele too old to compete in the 2023 world junior championship, Mitchell took his place in the lineup at third. As they won the Canadian junior championship the year prior, Team Rooney was invited to compete in the
2022 PointsBet Invitational. There, they lost 11–3 to
Brendan Bottcher in the opening round. In February 2023, the team played in the
2023 World Junior Curling Championships in
Füssen,
Germany. After losing their first three games, they were never able to recover, finishing eighth in the standings with a 3–6 record and relegating Canada to the "B" championship for 2024.
Men's 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. This rink saw immediate success by winning the
U25 NextGen Classic, though Mitchell was replaced by alternate
Connor Deane for the event. They also reached the final of the
Gord Carroll Curling Classic where they lost to
Luc Violette. After qualifying for the
2023 Ontario Tankard through the Trillium U25 Series, they went 3–2 in the round robin and missed the playoffs. They ended the year with an undefeated run to win the St. Catharines Golf & CC Cash Spiel. Team Mooibroek reached the final of the NextGen Classic again in 2023, however, were defeated by
Rylan Kleiter in the final. 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. Following the Slam, Team Mooibroek reached four consecutive tour finals at the
Stu Sells 1824 Halifax Classic, the
Stu Sells Living Waters Collingwood Classic, the
Stu Sells Brantford Nissan Classic and the
Comco Cash Spiel, however, only won the latter. 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. 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. Colin Schnurr stepped back from competitive curling after the season and was replaced by
Ryan Wiebe. He slotted in at third while Mitchell and Steele moved to second and lead respectively. After finishing the previous season ranked eleventh on the
CTRS standings, Team Mooibroek qualified for the
2024 PointsBet Invitational. There, they lost to Team Kleiter 5–2 in the opening round. Elsewhere on tour, the team made it to the semifinals of the
2024 Tour Challenge Tier 2 where they were again taken out by Kleiter. For a second straight year, they lost in the final of the Stu Sells 1824 Halifax Classic, this time to
Jeong Byeong-jin of Korea. In December 2024, they won the Stu Sells Brantford Nissan Classic for a second time, defeating
Jonathan Beuk in the final. In the new year, the team again entered the
2025 Ontario Tankard as the top ranked team and went undefeated to capture the Ontario provincial title. 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. At the Brier, the Mooibroek rink would finish the round robin at 4–4, just missing out on the playoffs. Team Mooibroek would start the
2025–26 curling season off strong, winning the
2025 U25 NextGen Classic 6–4 over Manitoba's
Jordon McDonald. This granted the Mooibroek rink a spot in Curling Canada's new national "NextGen Program" for the
2025–26 curling season, which included $6,000 in program funding and access to Curling Canada's National Coaches, among other benefits. Team Mooibroek would also participate in the Tier 2
Masters Grand Slam event, where they would lose in the quarterfinals to
Kevin Koe. Their success over the previous two seasons would qualify Mooibroek to the
2025 Canadian Olympic Curling Pre-Trials, where they would finish round robin play at 3–4, finishing in 6th place. ==Personal life==