Wassmer was born in
Wehr, Baden-Württemberg. He began his career in Switzerland with
FC Aarau in 1985 and spent three years with the club before joining
Schalke 04 of Germany. After just one season with Schalke, he returned to Switzerland to play for
FC Basel. He spent just one season at Basel, also, and went back to FC Aarau for the second time in his career where he was part of the side that won the
Swiss national title in
1992–93. In 1993, he signed for
SC Freiburg where he went on to play over 100 matches, scoring 30 goals. On 22 September 1996, while playing for Freiburg, Wassmer set a
Bundesliga record in a game against
Bayer Leverkusen, by scoring just 13 seconds after his introduction, making it the fastest goal ever scored by a substitute.
Waldhof Mannheim signed him in 1999 and he retired in the Summer of 2000. On 1 July 2003, he became
manager of amateur Swiss team
Dottingen SV. During the 2003–04 season, his team were promoted to the regional league but were relegated after just one season. In August 2008, he was appointed manager of German side
SC Riegel. ==References==