Later, he attended the Pontifical Catholic University of Valparaíso (PUCV) where he did his bachelor of arts in laws.

Similarly, Valenzuela completed a Master of Arts in the same career.

During Sebastián Pinera's first government (2010−2014), he worked as Chief of Social Reintegration, department linked to the Ministry of Justice.

[4] From March 2018 to June 2019, once Pinera was elected again, Valenzuela worked as Chief of the Legal Division of the then new Ministry of Justice and Human Rights.

Then, on December 19, 2019, Valenzuela was appointed as Undersecretary of Justice,[5] a position he officially assumed on January 1, 2020.