Wassmer started his career at Hayes & Yeading United FC before catching the eye of Crawley Town – where he won promotion into EFL League One.

In 2017–18, at Hampton & Richmond Borough, Wassmer was named in the National League South team of the year after netting 8 goals from centre back.

Wassmer progressed through the youth teams at Hayes & Yeading United, making his debut on 13 April 2010 in a Conference National match at Salisbury City.

[11] On 22 November 2019, after enjoying a loan spell with the club, Wassmer joined National League South side Hampton & Richmond Borough for the third time.

[12] On 9 January 2022, the club released a statement saying that Wassmer's contract had been terminated due to an incident which took place during their fixture with Slough Town on 28 December 2021.