Estudillo was born and raised in Sunnyside, Washington, where his parents owned a small grocery store.

[3] After graduating law school, Estudillo began his legal career at Jeffers, Danielson, Sonn & Aylward in Wenatchee.

From 2002 to 2005, he was an attorney with Scheer and Zehnder in the Seattle office, where his practice focused on complex civil litigation.

[4] In 2015, he was appointed by Washington Governor Jay Inslee to serve as a judge for the Grant County Superior Court.

On April 29, 2021, President Joe Biden nominated Estudillo to serve as a United States district judge for the United States District Court for the Western District of Washington to the seat vacated by Judge Ronald B. Leighton, who assumed senior status on February 28, 2019.