A product of Universidad de Chile, Valladares was a member of the squad that won the league title in 2000.
He developed his entire career in his homeland, playing also for Deportes La Serena, Unión San Felipe, Audax Italiano, Deportes Melipilla, San Luis, Santiago Wanderers and Coquimbo Unido.
[1] At international level, he represented the Chile national under-17 team in the 1997 South American Championship.
[2] As a football manager, he began his career at the Santiago Wanderers youth ranks.
[3][4][5] In 2024, he joined the Universidad de Chile youth system as coach of the under-18's.