In 1999–2000, during the Romanian Democratic Convention cabinet, he worked as a Chief of Staff for Interior Minister Constantin Dudu Ionescu [ro].

[3] Hellvig entered the Romanian Humanist Party (PUR), as the PC was then called, in 2003, and served as interim head of its Bihor County chapter from 2004 to 2005.

[8] In November 2012, investigators from the National Integrity Agency (ANI) charged that for several months, from the time he took ministerial office until he left Sintezis that September, he was, legally, in a conflict of interest.

Hellvig denied the charges, which were upheld the following April by the Bucharest Court of Appeal, prompting him to state he would continue to fight for vindication.

[9] In December 2014, the High Court of Cassation and Justice decided in Hellvig's favor, ruling that he had not been in a conflict of interest and rejecting the ANI's claims.

[13] In February 2015, President Klaus Iohannis nominated him to be director of the Romanian Intelligence Service;[14] the following month, a joint session of Parliament confirmed him to the post on a 498–15 vote.