Quality Control TechnicianCastle Builders Supply - Western, PA RegionAbout Us Castle Builders Supply, a member of the PJ Dick-Trumbull-The Lindy Group family of companies, is a leader in the Redi Mix industry in the western Pennsylvania. constantly to move objects; Requires manual dexterity and ability to bend, twist, turn, stretch, squat, kneel, sit and stand for extended periods; Must be able to work in elevated, enclosed and sometimes hazardous areas in changing weather conditions.