Before his post, Ambassador Rojas served in the Paraguayan public sector as the Minister of Finance from 2013 to 2014, as President of the Central Bank of Paraguay from 2007 to 2008, and as Chairman of the National Development Bank between 2003 and 2007. In the private sector,Ambassador Rojas has been Vice President of Sudameris Bank and Assistant to the President of Abbeyfield Group (Irish investor group).

Ambassasor Rojas has a Bachelors degree in Business Administration and Accounting from Catholic University Nuestra Señora de la Asunción and a specialization in Economics of Developing Countries from the University Erlangen-Nuremberg.