Feiersinger starter her senior career with USK Hof in the ÖFB-Frauenliga, the Austrian league.

Feiersinger was recruited and signed for Herforder SV who then played in the Frauen-Bundesliga, the top flight of German Football.

[4][5][6] During her first year at the club she won the DFB Pokal, Germany's second-most important title in women's football.

[11] Feiersinger moved to SC Sand ahead of the 2016–2017 season in order to get more regular playing time.

She was part of the squad which qualified and went to their first major tournament, the UEFA Women's Euro 2017 in the Netherlands.

[21] When Feiersinger was younger she tried a variety of sports including biathlon, athletics, cross country and football.

She entered the Austrian sports school model (SSM) and at age 15 decided to specialize as a footballer.

[21] Feiersinger is one of UEFA's official ambassadors for #WePlayStrong, a social media and vlogging campaign which was launched in 2018.