Mooibroek won his first provincial title in 2016 at the U18 Ontario Curling Championships, skipping his own team of Emerson Steffler, Mathew Garner and Spencer Dunlop.

After beating Cameron Goodkey in the semifinal, they reached the final where they gave up steals in the ninth and tenth ends to lose the game 8–7 to Sam Steep.

[12] Back fulltime for the 2022–23 season, Mooibroek and his teammates defended their title at the OUA championship, defeating Queen's Golden Gaels 6–5 in an extra end final.

In the playoffs, they scored four in the tenth end to fend off Queen's 12–10 in the semifinal and then beat Dalhousie 9–7 in the championship game to capture the gold medal.

[17] In his first year out of juniors, Mooibroek and his team of Garner, Brady Lumley and Dunlop won the Stu Sells Brantford Nissan Classic, losing just one game en route to claiming the title.

[23] 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.

[25] 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.

[26] 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.

[28] After finishing the previous season ranked eleventh on the CTRS standings, Team Mooibroek qualified outright for the 2024 PointsBet Invitational.

[33] 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.