Tjark Ernst

Ernst is a youth product of the German clubs TSG Niederdorfelden, DJK Arminia Bochum and Bochum. On 12 February 2022, he first made a senior match day squad as the backup goalkeeper for Bochum in a Bundesliga match against Bayern Munich. On 30 June 2022, he transferred to Hertha BSC on a contract until 2026 and was originally assigned to their reserves. He made his senior and professional debut with Hertha in a 2–1 Bundesliga win over Wolfsburg on 27 May 2023.

Feyenoord

In July 2026, Ernst signed a four-year contract with Dutch club Feyenoord.

Ernst is a youth international for Germany, having played at every youth level for them. In September 2023, he was called up to the Germany U21s for a 2025 UEFA European Under-21 Championship qualification match.

As of match played 20 September 2026

Ernst's father Thomas Ernst was also a professional football goalkeeper, and his mother Kerstin Pohlmann was also a professional footballer.