From 2012 to 2015, Brunmayr managed academy teams of
LASK. In the summer of 2015, he became coach of
FC Juniors OÖ and later the LASK under-19 team. In 2018, he was promoted to the 2nd league with the Juniors. During the winter break of the 2018–19 season, Brunmayr returned to LASK. The following season he went back to the Juniors as assistant coach to
Gerald Scheiblehner. In January 2020, he became the coach of
FC Blau-Weiß Linz. In the 2020–21 season they won the championship title in the
Second league. Brunmayr left Blau-Weiß for the 2021–22 season and became
Oliver Glasner's assistant coach in Germany at
Bundesliga club
Eintracht Frankfurt. They won the
2021–22 UEFA Europa League with Frankfurt in the final on 18 May 2022. In 2023 he left Frankfurt together with Glasner. On 19 February 2024, Brunmayr linked up with Glasner again, becoming assistant manager at
Premier League club
Crystal Palace. ==International goals==