Born in
Spittal an der Drau, Stratznig grew up in
Mühldorf and began his career at the local club SC Mühldorf. By the end of the 2018–19 season, he had made 11 appearances at the third level. He made his first appearance in the starting eleven on 21 June in a 2–2 draw against
Red Bull Salzburg. He suffered an ankle injury in a game against Red Bull Salzburg in February 2022, ruling him out for an extended period. Stratznig left Wolfsberger AC as his contract expired at the end of the 2021–22 season, after declining an extension offer by the club. On 23 February 2023 he joined Second League club
First Vienna FC. ==International career==