They debuted on the ISU Junior Grand Prix series in the 2012–2013 season but ended their partnership after placing tenth in Lake Placid, New York and ninth in Zagreb, Croatia.

Competing in the 2013–14 ISU Junior Grand Prix series, they placed fourth in the Czech Republic and fifth in Belarus.

[8][9] During the 2014 JGP series, Séguin/Bilodeau outscored Russia's Lina Fedorova / Maxim Miroshkin for the gold medal in Ostrava, Czech Republic.

At the latter event, held in December 2014 in Barcelona, they placed first in both segments and won the gold medal by a margin of 9.79 points over Fedorova/Miroshkin.

In February, they were awarded the silver medal at Junior Worlds in Tallinn, Estonia, having placed second to China's Yu Xiaoyu / Jin Yang.

In March, they ranked tenth in both segments and finished eighth overall at the World Championships in Shanghai, China.

While practicing a throw jump in early February, she injured her ankle, resulting in torn ligaments and a bone contusion which would take two to three months to heal.

Séguin sustained two further concussions – the second occurred at an ice show in April and the third while practicing a lift in July 2017.

[16] In January, Séguin/Bilodeau won the silver medal at the 2018 Canadian Championships, having placed second in both segments, and were nominated to represent Canada at the Olympics.

[18] They planned to use Groove Is in the Heart by Deee-Lite for the short program and Wicked Game by Theory of a Deadman for the free skate.

[20][21] On March 4, 2019, Skate Canada announced that Bilodeau had formed a new partnership with Liubov Ilyushechkina, whose previous partner, Dylan Moscovitch, had retired at the end of the 2017–18 season.

Placing third in the short program and second in the free skate, they won the bronze medal, less than a point behind silver medalists Alisa Efimova / Alexander Korovin.