Four years later, in 1910, he became president of the Sociedade Anônima Elétrica Rio Claro, a notorious company on the field of electric energy in the State of São Paulo, where he remained until 1934.

Besides remaining as the head of Mercantil Bank, Carsoso was also a part of Comercial Bank of the State of São Paulo's (Banco Comercial do Estado de São Paulo), Rodrigues Alves Agricultural Company's (Companhia Agrícola Rodrigues Alves) and Piraçununga's Wiring and Weaving's (Fiação e Tecelagem de Piraçununga) Administrative Council.

In the beginning of 1929, the Democratic Party joined the Liberal Alliance, a coalition of politic forces in opposition to the Washington Luís's government that introduced the candidacy of Getúlio Vargas and João Pessoa to the Brazilian presidency and vice-presidency.

Cardoso de Melo Neto, as the representative chosen, was part of the Liberal Alliance's convention which validated the opposition's candidacy pleas.

Having governed provisionally the state for only four days, (until October 28, 1930), the general composed sort of a council, of which members of the Democratic Party were part of.

Elected as federal deputy on the same year, Cardoso got to join the Mixed Commission of Economic-Finance Reform, and accumulated his parliamentary roles to the presidency of São Paulo's Mercantil Bank and the lighting company Jundiaí's Strength.