Together with Supreme Federal Court Justice Gilmar Mendes, he wrote the book Constitutional Law Course, which won the Jabuti Prize in 2008.

[2] From 1982 to 1987, he worked in the Supreme Federal Court as an assistant to Justice Francisco Rezek, who had been his professor in law school.

[5] Since he joined the Federal Public Ministry before the 1988 Constitution was in effect, he is not barred from working as a lawyer, having done so since 1994,[1] also becoming a partner of the Sergio Bermudes law firm.

[7] Gonet is a council member in the Center for Higher Studies in Control and Public Administration at the Federal Court of Accounts.

In July 2023, he presented an opinion to the Superior Electoral Court of Brazil in favour of convicting former president Jair Bolsonaro for abuse of political power.