[4] In 2017, he moved to the regional academy of AKA Vorarlberg, where he progressed through all youth teams in the following four seasons.
[4] In September 2020, he signed a professional contract with Rheindorf Altach, which had already been reported as his first senior club ahead the 2020–21 season.
[5] Before the 2021–22 season, he was officially promoted to the first-team squad competing in the Austrian Football Bundesliga.
[7] Mischitz made his debut for Austria under-16s on 23 October 2018, starting a 4–1 friendly loss against Poland.
[8] He made his first appearance at under-17 level one year later in a friendly against Switzerland; he marked the occasion by scoring his team's only goal in a 4–1 loss.