[1] Alvarado started his career at Municipal de San Salvador, and joined fellow capital outfit Telecom FC in 1997.
In August 2014, Alvarado scored in a 5–1 victory against Juventud Independiente in the Complejo Municipal de San Juan Opico.
With the scarlet team, Alvarado experienced an administrative, economic and sports crisis, with severe delays in salary payments.
With the team of San Salvador, Alvarado experienced a sports, economic and institutional crisis.
He officially received his first cap on February 1, 2009, in a UNCAF Nations Cup match against Honduras (0–1 defeat).