He is on the books of Bischofswerdaer FV and wears shirt number 36. His main role on the pitch is Midfield.

His latest transfer saw him join Aufbau Deutschbaselitz from Bischofswerdaer FV via on 2025-07-01.

Over 13 appearances in the German U19 Youth League 2023-2024, Mathis Seifert contributed 0 goals and 0 assists, completed 0 key passes from 15 total passes, and posted a passing accuracy of 0.7.