Prior to joining the legislature, he volunteered for several political campaigns, including those of former Governor Janet Napolitano, Congressmen Ruben Gallego and Congressman Ed Pastor.

Fernandez worked for the Congressional Black Caucus under Chairwoman Carolyn Cheeks Kilpatrick as Technology Director.

In November 2021, Fernandez's mother resigned to become Director of Rural Development for the United States Department of Agriculture.

Fernandez was instrumental in passing and later funding in a last minute budget deal the expansion and modernization of Cesar Chavez Blvd in San Luis, Arizona for 34 million dollars.

Fernandez brought 5 million dollars in a last minute budget deal to the Yuma campus of Northern Arizona University.

Fernandez brought together farmers and ranchers throughout the state to bring a billion dollar spending bill on water infrastructure.