[1][2] Muniz originally wanted to become a priest, which is why he initially attended a seminary, but changed his mind and transferred to the Anglo-Brazilian college in Rio de Janeiro.

[2] After college, starting in 1918, he attended the University of Rio de Janeiro, which he graduated from in January 1921 as an engineering candidate.

[2] He joined the Brazilian Army and did his service with the Companhia de Aviação da Arma de Engenharia, whose main mission was to maintain the Army Air Force Base and later the Air Force Base Campo dos Afonsos.

[4][1] Upon his return to Brazil, he became director of the Técnicos da Aviação Militar and developed other aircraft, several of which were built and successful.

Eventually, the Companhia Nacional de Navegação Aérea was founded, which produced several of Muniz's designs.