T.C. McCartney rejoined the 49ers in 2017 as an offensive assistant, having served in that role with the team in 2015. In 2016, he worked at Louisiana State University as an offensive assistant. He entered the NFL coaching ranks in 2014 as quality control coach with the Cleveland Browns.
Prior to joining the Browns, McCartney was an offensive graduate assistant for two seasons (2012-13) at the University of Colorado. While at Colorado, McCartney worked closely with offensive coordinator/quarterbacks coach Brian Lindgren and the quarterbacks while also assisting with various parts of the entire offense.