[4][5] His breakthrough came during the 2018–19 Primera División campaign, as he was an unused substitute for league fixtures with Gimnasia y Esgrima and Newell's Old Boys.

[2][6][7] Gustavo Alfaro selected the defender for his senior debut in the Copa Argentina on 19 April 2019 versus Torneo Federal A's Estudiantes, he played the full duration of a 2–0 victory.

[2] He appeared again later that month in the Copa de la Superliga versus Godoy Cruz, as they won the round of sixteen first leg away from home.

[2] After ten further appearances for Boca, including five in the Copa Libertadores, Weigandt was loaned out in 2020–21 to fellow Primera División side Gimnasia y Esgrima.

[9] Weigandt represented Argentina at the 2017 South American U-17 Championship in Chile, featuring against Venezuela and Paraguay as they were eliminated at the first group stage.