He won the bronze medal in the men's 3 metre synchronized springboard event at the 2015 European Games held in Baku, Azerbaijan, alongside Nico Herzog.

[2] Seidel competed in the men's 1 m springboard event at the 2016 European Aquatics Championships held in London, United Kingdom.

In 2019, Seidel won the silver medal in the men's 1 metre springboard event at the Summer Universiade held in Naples, Italy.

[3][4] In the same year, he competed in the men's 1 metre springboard event at the 2019 World Aquatics Championships held in Gwangju, South Korea.

This biographical article relating to German diving is a stub.