Timmer played college soccer for over five seasons at Butler University between 2015 and 2019, making 67 appearances, scoring 6 goals and tallying 13 assists.[1] Timmer captained the team for his final three seasons at Butler.
On March 3, 2020, Timmer joined USL Championship side Reno 1868.[8] He made his debut on July 29, 2020, appearing as a half-time substitute during a 4–1 win over Portland Timbers 2.[9] Reno folded their team on November 6, 2020, due to the financial impact of the COVID-19 pandemic.[10]
On December 11, 2020, Timmer joined USL Championship club Indy Eleven ahead of their 2021 season.[11] He was released by Indy Eleven on November 30, 2022, following the conclusion of the 2022 season.[12]
Timmer was announced as a new signing USL Championship side Sacramento Republic ahead of their 2023 season.[13]
