Hosoi started skating at seven or eight years old with veterans such as Shogo Kubo, Tony Alva, Stacy Peralta, and Jay Adams as his idols. His father, Ivan “Pops” Hosoi became the manager of the Marina Del Rey Skatepark, and Christian quit school and spent his time there where he developed his skill. In 1979, as an amateur, Hosoi was sponsored by Powell Peralta. He left Powell Peralta a year later when they wouldn't allow him to turn professional and joined Dogtown Skateboards. Shortly thereafter, Dogtown went out of business. Christian turned pro at the age of 14 with Sims Skateboards.
Christian Hosoi emerged as a competitor of vertical riding alongside such pros as Steve Caballero, Mike McGill, Lester Kasai, and Mark “Gator” Rogowski
Hosoi invented the Christ Air and Rocket Air. In 1984 he formed his own company, Hosoi Skates, first distributed through Skull Skates, then through NHS-INC.
When street skating began to emerge in the mid-to-late 80s, Hosoi showed talent there, winning both the vert and street contests at the Lotte Cup contest in Japan in 1989.