Career
Hayer played in the youth team of Bayer Leverkusen, but made his breakthrough in senior football with seven years at Germania Dattenfeld (later renamed Germania Windeck). In 2010 he signed for Kickers Offenbach of the 3. After two years without fully establishing himself at Offenbach, he signed for 1.
Football Club Saarbrücken in July 2012.
He was released by Saarbrücken in January 2014, after an injury-hit eighteen months with the club, and returned to his first club, signing for Bayer Leverkusen World War II He left Leverkusen for a second time when the club disbanded its reserve team at the end of the 2013-2014 season.