He represented Austria at the 2019 World Aquatics Championships in Gwangju, South Korea.

In 2017, he won the silver medal in the boys' 200 m breaststroke at the European Junior Swimming Championships held in Netanya, Israel.

[2] In 2020, he set a new Austrian record in the men's 100 metre breaststroke at the inaugural 4 Nations Meet held in Budapest, Hungary.

[3] Bayer competed in the men's 4 × 100 metre medley relay event at the 2024 Summer Olympics held in Paris, France.

This biographical article related to an Austrian swimmer is a stub.