His work includes advocacy for freedom of expression, fundamental rights, and democratic values in Venezuela and other authoritarian regimes.

[1] In 2008, he founded Futuro Presente, a non-profit organization focusing on mobilizing and educating young people on democratic values and rule of law in Venezuela; it received funding from the Cato Institute.

[3] In May 2009, Diamanti founded Un Mundo Sin Mordaza, a non-governmental organization which promotes human rights and freedom of expression using artivism.

[13][14] In 2020, Diamanti and Un Mundo Sin Mordaza created a campaign for the reinstatement of DirecTV signal in Venezuela, denouncing the attacks on freedom of expression in the country.

[17] As of 2023, Diamanti is the founder and chairman of the board at Freedom Academy, which trains activists in non-violent methods for challenging authoritarian regimes.