Brandt started his career in the youth teams of the SC Borg Field and FC Oberneuland, before joining the 2011/12 season in the B- Youth ( U -17) of VfL Wolfsburg. There, he scored in the B- youth league 14 goals in 25 games. For the season 2012/13 Brandt was appointed to the A- Youth ( U -19). In his first season in the A- youth league, he scored in 23 games in the regular season with 13 goals. In the final round, at the end of Brandt and his team secured the championship in the final against Hansa Rostock, he scored another goal in three missions. In the first half of the 2013/14 season Brandt arrive in 14 games six more goals.
1 January 2014, Brandt joined Bayer 04 Leverkusen. He signed a professional contract until 30 June 2019. On February 15, 2014 Brandt came in the match against FC Schalke 04 on his first Bundesliga use when he came on in the 82nd minute for Heung- Min Son. On February 18, 2014, he made his Champions League debut when he came off the bench to start the second half in the game against Paris Saint- Germain. In his seventh Bundesliga for Bayer 04 Leverkusen he succeeded in the 1-2 defeat in the away match against Hamburger SV on April 4, 2014 ( 29 Matchday) the deficit to intermediate 1:1 in the 58th minute, his first Bundesliga goal.
- A German Youth Champion: 2013