first-choice goalkeeper he stayed on the substitute bench throughout the season. Greuther Fürth With a lack of first team opportunities at SC Freiburg, Mielitz opted to join Greuther Fürth on 11 June 2015, signing a two–year contract. Upon joining the club, he was expected by then-manager Stefan Ruthenbeck, who was appointed one day before he signed for them, to fight for the first-choice goalkeeper role. Mielitz made his Greuther Fürth debut in the opening game of the season, keeping a clean sheet in a 1–0 win over Karlsruher SC. After making his debut, he quickly established himself as a first-choice goalkeeper at Greuther Fürth. After keeping two more clean sheets against VfL Bochum and Eintracht Braunschweig at the end of September, he, however, conceded 10 goals in the next two matches, with a defeat to VfL Bochum. and Freiburg. In the following match against 1860 Munich, Mielitz was able to redeem himself when he kept a clean sheet, in a 1–0 win. Throughout the 2015–16 season, he remained the first-choice goalkeeper and played every match until he was dropped on the last game of the season in a favour of Mark Flekken against SV Sandhausen. Ahead of the 2016–17 season, the club signed three goalkeepers, Balázs Megyeri, Sascha Burchert and Marius Funk, providing more competition for Mielitz. Because of this, Mielitz struggled to regain his role as the club's first-choice goalkeeper in his second season and Megyeri was preferred instead. As a result, Mielitz made no appearances for the side this season and played twice for the reserve side. At the end of the 2016–17 season, he was released by the club after being told that they would not extend his contract. SønderjyskE With his Greuther Fürth contract running out at the end of the 2016–17 season, Mielitz joined Danish Superliga club SønderjyskE for the new season on a two-year contract with the option of a third in May 2017. Mielitz made his debut for SønderjyskE in the opening game of the season, in a 0–0 draw against Randers and keeping a clean sheet in the process. Since making his debut, he managed to dispatch the first choice goalkeeper role from Lukas Fernandes. Mielitz won the 2019–20 Danish Cup with SønderjyskE. Viktoria Köln In July 2020, Mielitz joined 3. Liga side FC Viktoria Köln on a free transfer. In his first season, Mielitz was the first choice and made 37