[4] Mouat would again skip Scotland at the 2016 World Junior Curling Championships, this time with teammates Bobby Lammie, Gregor Cannon along with Dowell again.
[8][9] The team won their first tour event at the 2015 Dumfries Challenger Series, defeating previous Scottish champion Tom Brewster in the final.
[10] They also reached the semifinals of the Challenge Chateau Cartier de Gatineau following wins over established men's teams such as John Epping, Sven Michel and Rasmus Stjerne.
[11] As they had won the 2016 World Juniors, the team was invited to compete in their first Grand Slam of Curling event, the 2016 Humpty's Champions Cup.
[13] In their final season of juniors, the team qualified for the 2016 Tour Challenge Tier 2 event where they again lost in a tiebreaker to Mark Bice.
[18] In the new year, the team ran the table to win the 2018 Scottish Men's Curling Championship, defeating the Greg Drummond rink in the final.
[19] They then faced the Kyle Smith Olympic team in a best-of-three playoff to determine who would represent Scotland at the 2018 World Men's Curling Championship.
[25] After finishing the round robin with a 7–2 record, Mouat beat Italy's Joël Retornaz and Sweden's Niklas Edin in the semifinal and final to claim the gold medal.
[34] The team was set to represent Scotland at the 2020 World Men's Curling Championship on home soil in Glasgow before the event got cancelled due to the COVID-19 pandemic.
[37] For much of the 2020–21 season, there was no tour due to the pandemic, but Mouat and his team won a series of domestic challenges put on by the British Curling Association.
In the playoffs, he beat the defending champion John Shuster rink from the United States before losing the gold medal to Sweden, skipped by Niklas Edin.
[52] After a quarterfinal appearance at the 2023 Canadian Open, Team Mouat went undefeated to claim their fourth Scottish men's championship, defeating the James Craik junior rink in the final.
After defeating Retornaz in an extra end, the team shot a 96 percent game in the final to down Canada's Gushue 9–3 and claim the gold medal.
Team Mouat turned things around with a hot start to the 2023–24 season, winning the 2023 Euro Super Series and the 2023 Stu Sells Oakville Tankard.
After having limited success at the previous three Slams, Team Mouat claimed their sixth title with an undefeated run at the 2024 Canadian Open, defeating the Brendan Bottcher rink in the final.
After defeating the United States in the first round, they lost both the semifinal and bronze medal game to Canada and Italy, failing to defend their title and finishing fourth.
In 2012, he and partner Gina Aitken won the Scottish Mixed Doubles Curling Championship, defeating the pair of Claire Sloan and Graham Shedden in the final.
[65] This qualified the team for the 2013 World Mixed Doubles Curling Championship in Fredericton, New Brunswick where they earned a playoff spot with a 6–2 record.
[68] After losing in the semifinals in 2014, Aitken and Mouat earned their third national mixed doubles title in 2015, this time beating Abigail Brown and Grant Hardie in the final.
[69] The pair would then have their best finish to date at the 2016 World Mixed Doubles Curling Championship, beginning with a 4–2 record in the round robin and a tiebreaker victory over Czech Republic.
[70] The next season, the pair once again beat the McCleary's to defend their title, securing a trip to the 2017 World Mixed Doubles Curling Championship.
After defeating Canada in the semifinal, the pair won Scotland's first world mixed doubles title with a 9–7 victory over Norway's Kristin Skaslien and Magnus Nedregotten in the gold medal game.
[76] With their strong performance at the world championship, Dodds and Mouat were named to the 2022 British Olympic team in October 2021 as the mixed doubles representatives.
At the end of the season, the team went undefeated at the national championship until the final where they lost 9–2 to Mouat's teammate Bobby Lammie and Eve Muirhead, who went on to win the world title.
In their first event, the team won the Hardline Open super series, defeating Laura Walker and Kirk Muyres in the final.
At the Scottish championship, Mouat lost just one game en route to claiming his sixth national doubles title, this time defeating Sophie Jackson and Duncan McFadzean.