Mendonca entered the Ontario provincial coaching scene in 1984 before moving up to the national junior men’s program in 1992. Between 1999 and 2012, Mendonca held various coaching positions with the senior programs including head coach of both the women’s and men’s national team. A highlight of his career included the 2007 Pan American title and a qualification spot at the 2008 Olympic Games. In total, Mendonca served as head coach at four Pan American and two Commonwealth Games. His dedication to coaching was recognized in 2012 when he received the Andy Higgins Lifetime Coaching Achievement Award. Mendonca remains active in the Ontario regional programs and is the longstanding Director of the Canadian National Indoor program.