Feiersinger starter her senior career with USK Hof in the ÖFB-Frauenliga, the Austrian league. She spent two years at the club, playing in 36 regular season games and scoring 9 goals.
Feiersinger was recruited and signed for Herforder SV who then played in the Frauen-Bundesliga, the top flight of German Football. This move required her to leave home at age 18. While playing for Herforder she made 18 regular season appearances, scoring 7 goals. Feiersinger left the club after they were relegated to the 2. Frauen-Bundesliga.
Bayern Munich, 2011–2016
Feiersinger signed for Bundesliga side FC Bayern Munich in 2011. During her first year at the club she won the DFB Pokal, Germany's second-most important title in women's football. In March 2014 she suffered a serious injury, breaking her shin and fibula. However, she was able to get her contract with the club renewed in 2015. She went on to win back to back Frauen Bundesliga titles in 2014–2015 and 2015–2016. At the time of her departure in 2016 Feiersinger had made 62 regular season appearances.
Feiersinger moved to SC Sand ahead of the 2016–2017 season in order to get more regular playing time. During her first season with the club she was runner-up for the 2016–17 DFB-Pokal Frauen. She left SC Sand after two seasons, 39 regular season appearances and 5 goals.
FFC Frankfurt, 2018–
Feiersinger signed Bundesliga side 1.FFC Frankfurt ahead of their 2018–2019 season on a two-year contract. During her first year with the club she made 21 appearances, scoring 10 goals.
When Feiersinger was younger she tried a variety of sports including biathlon, athletics, cross country and football. She entered the Austrian sports school model and at age 15 decided to specialize as a footballer. Wolfgang Feiersinger, her father, is a former footballer who won the champions league playing for Borussia Dortmund and also played for the Austrian national team. Feiersinger also pursued a bachelor's degree in sports science.
Feiersinger is one of UEFA's official ambassadors for , a social media and vlogging campaign which was launched in 2018. The campaign's "...aim is to promote women’s football as much as we can and to make people aware of women’s football, really,” Evans, another participant explains. “The ultimate goal is to make football the most played sport by females by 2020. So it’s a UEFA initiative to get more women and girls playing football, whether they want to be professional or not.” The series, which also originally included professional footballers Sarah Zadrazil, Eunice Beckmann, Lisa Evans and now also includes Petronella Ekroth and Shanice van de Sanden, follows the daily lives of female professional footballers.
