Beatriz had minor roles in the police procedural television series The Closer and Southland, as well as a recurring role as Gloria's sister Sonia in the ABC comedy series Modern Family. She has had numerous stage appearances at the Oregon Shakespeare Festival, Theatreworks USA, The Old Globe Theatre, and Yale Repertory Theatre. Beatriz had her first feature film role as Jessica in the 2013 acclaimed independent drama Short Term 12.
Since 2013, she has portrayed Detective Rosa Diaz in the Fox and NBC series Brooklyn Nine-Nine, an action comedy series based around the members of a Brooklyn police precinct. In 2019, she directed the season 6 episode "He Said, She Said".