Guillén has appeared in recurring roles on a number of television series, such as Alistair Delgado on Huge (2010), Cousin Blobbin on The Thundermans (2013–2018), George Reyes in Eye Candy (2015), and Benedict Fenwick on The Magicians (2017–2018).He also appeared in the 2013 film The Internship. Beginning in 2019, Guillén has played the role of Guillermo, the vampires' human familiar, in the FX television series What We Do in the Shadows.He was also set to appear in Quibi's science fiction drama series Don't Look Deeper,before the platform shut down in December 2020. Guillén has received considerable acclaim for his role as Guillermo. TheWrap included Guillén in a list of "2019 Emmy Contenders".hank Steuver, in his review of What We Do in the Shadows in The Chicago Tribune, stated that Guillén "provides at least half the big laughs" in the show.
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