Boffi played club football with Seregno, AC Milan and Atalanta. During the 1938–39 season, he was joint-"capcannonieri" (top scorer) in Serie A, along with Ettore Puricelli of Bologna, with 19 goals; he managed the same feat in the 1939–40 and 1941–42 Serie A seasons, with 24 and 22 goals respectively.