He played college football for the Notre Dame Fighting Irish, twice earning All-American honors before being selected fifth overall by the Chargers in the 2024 NFL draft.

[3][4] As a true freshman at Notre Dame in 2021, Alt played offensive tackle and tight end.

[7] He was unanimously named to the 2023 College Football All-America Team and declared for the 2024 NFL draft following the season.

[8][9] Alt was selected by the Los Angeles Chargers fifth overall in the 2024 NFL draft.

[14] His father, John Alt, played in the NFL for the Kansas City Chiefs.