Born in Aschaffenburg, Bommer played 417 games between 1976 and 1996 for Fortuna Düsseldorf, Bayer Uerdingen and Eintracht Frankfurt in the Bundesliga.

[2] Bommer started his coaching career with the reserve team of Eintracht Frankfurt between July 1994 and August 1995.

[5] Bommer became head coach Wacker Burghausen in October 2000[3] and won his debut 4–3 against his former club VfR Mannheim.

[3] Bommer then went to MSV Duisburg between July 2006 and November 2008; finishing with a league record of 28 wins, 21 draws, and 31 losses.

[3] In October 2015 he became the new coach of Regionalliga Bayern club Viktoria Aschaffenburg, replacing the sacked Slobodan Komljenović.