He developed through the academy of Eintracht Frankfurt and has represented Germany at various levels, including the senior national team.

[4] Exactly one year later, on 25 April 2015, Waldschmidt made his Bundesliga debut, as a 73rd-minute substitute for Sonny Kittel in a 0–2 home loss to Borussia Dortmund.

[5] He scored his first goal for Eintracht Frankfurt on 8 August in a 3–0 win over Bremer SV in the first round of the German cup.

[6][7] He made his first appearance for the Hamburg club in the Bundesliga in a 0–4 home loss to RB Leipzig on 17 September, coming on as a substitute in the 83rd minute, replacing Bobby Wood.

[8] He scored his first goal for the club a few seconds after coming on, in a 4–0 win over Hallescher FC on 24 October, in a second-round cup fixture.

[11][12] In May 2018, SC Freiburg announced they had signed Waldschmidt for the 2018–19 season from Hamburger SV, newly relegated to the 2.

[19] On 29 August 2019, Waldschmidt was called up to Germany's UEFA Euro 2020 qualifiers against Netherlands and Czech Republic.