In the 1930s, he worked as an insurance agent, activity that was interrupted by the Spanish Civil War, during which fought in the republican army.
In 1949, he began to publish in the Pulgarcito magazine the series that would give him his major celebrity, El loco Carioco.
Other characters born in these years were Mi tío Magdaleno (1951), Apolino Tarúguez, hombre de negocios (Apolino Tarúguez, businessman, the misadventures of a tyrannical boss and his two employees) and La vida adormilada de Morfeo Pérez (the sleepy life of Morfeo Pérez) (1952).
This last one was an unusual series in the Spanish comics of the time, since it put in scene the wild dreams of the mediocre protagonist, although the last panel of the page returned him inexorably back to his frustrating reality.
Besides his work as a comic strip creator, Conti specialized in the creation of graphical jokes for several magazines of the Bruguera Publishing house.