'Castillo spent the past four seasons as the Ravens offensive line coach. A 22-year NFL coaching veteran, Castillo reunites with McDermott in Buffalo after spending time with him in Philadelphia. Castillo spent 18 seasons with the Eagles, filling the role of the team’s offensive line coach from 1998 to 2010 and then was the team’s defensive coordinator in 2011 and 2012. Castillo originally got his NFL start with the Bills, participating in the team’s Bill Walsh Minority Coaching Fellowship in 1992.'