As a youth player, Feiertag joined the
youth academy of Austrian side
SV Horn. In 2014, he joined the youth academy of Austrian side
SKN St. Pölten, where he received interest from a German
Bundesliga side. The same year, he joined the youth academy of Austrian side
Austria Wien, where he started his senior career with the club's
reserve team. Two years later, he signed for Austrian side
SKU Amstetten. Following his stint there, he signed for Austrian side
Blau-Weiß Linz in 2023. While playing for the club during the
2023–24 Austrian Football Bundesliga, he made twenty-seven league appearances and scored one goal. Subsequently, he was sent on loan to Polish side
ŁKS Łódź in 2024. On 31 January 2025, Feiertag moved on a new loan to
1. FC Saarbrücken in German
3. Liga. On 14 August 2025, Feiertag moved back to the Polish
second division, signing a one-year deal with recently promoted
Wieczysta Kraków. ==Honours==