During the scholastic year 1925/26, in addition to being a student, he took up the role of substitute teacher of Complementary Organ in the same Conservatory.
The following year, with the higher license of piano for which he achieved the excellent grade of 9,79 from the Commission presided over by Ildebrando Pizzetti, he was nominated for the position of teacher at Varese and Busto Arsizio.
He remained at the Musical Institute “G. Rossini” in Busto until 1932, when he took up posts in Milan at the Lyceum Institute “Leone XIII”, at the Marcelline Sisters and the Ursuline Sisters.
Maffeis’s service at the Musical Institute G.B. Pergolesi of Varese ceased in 1935, due to the excessive politicization of musical careers.
At the same time he began to perform liturgical services in the Archiepiscopal College S. Carlo of Milan and in the Seminary of Seveso S. Pietro.
During these years participation in the world of entertainment in Milan intensified, in particular in that of melodrama. He was inspired and motivated to personally compose operas.
This was how the first Opera-farce, “Il Maestro Smania”, in one act, was born, on a libretto by Antonio Ghislanzoni. He then composed the imposing Opera, “Le tre notti di luce”, inspired by the drama of the conversion of Jacopone da Todi on a libretto by Giovanni Mari.