Firus began learning to skate in 2001. He teamed up with Caelen Dalmer in May 2008. Dalmer/Firus were coached by Rod Mackie and Shae Zukiwsky before joining Megan Wing and Aaron Lowe, in Burnaby, British Columbia. They competed at two ISU Junior Grand Prix events (in 2011 and 2012) and won the junior bronze medal at the 2013 Canadian Championships. Their partnership ended in 2013.