With the Nets, McByrne was an assistant video coordinator under head coach Avery Johnson from 2010-11 and an intern under previous head coach Lawrence Frank, from 2009-10. During the 2010-11 season McByrne also worked alongside current Utah head coach Larry Krystkowiak, who was then an assistant coach with New Jersey. Other notable coaches McByrne has worked with include Popeye Jones, Del Harris, John Loyer, Sam Mitchell and Kiki Vandeweghe.
McByrne is originally from Newtown, Pennsylvania, where he attended Council Rock High School South and was captain of the basketball team. He earned his bachelor's degree in Secondary Social Studies Education from the University of Tampa in 2008.