1. FC Nürnberg Stark made his Bundesliga debut on 27 April 2013 in a 2–1 loss to
1899 Hoffenheim. He made two more appearances for
1. FC Nürnberg in the
2012–13 season. In the
2013–14 season, Stark made appearances for both the first team and
second team. He made 21 appearances for the first team and two appearances. He scored two goals in 26 appearances for the first team. as he transferred to
Hertha BSC the following day. He had scored a goal in four league appearances for Nürnberg in the
2015–16 season. He was able to quickly establish himself as a starter, but suffered a setback in October 2015 due to injury, only returning to the starting eleven in February 2016. He scored his first Bundesliga goal for Hertha on 11 March 2016 in a 2–0 victory against
Schalke 04. In the following seasons he was also part of the regular team and also made his first European appearances, as Hertha were able to qualify twice for the
UEFA Europa League, but both times eliminated from the competition early. At Hertha, he mostly appeared as a
centre-back but also as a
defensive midfielder.
Werder Bremen On 28 May 2022,
Werder Bremen, newly promoted to the
Bundesliga, announced the signing of Stark for the
2022–23 season. He reportedly signed a four-year contract. ==International career==