[1] She played Octavia of the Julii in Rome (2005–2007),[2][3] Stacey Ehrmantraut in Better Call Saul (2015–2022), and was the voice of the artificial intelligence entity F.R.I.D.A.Y.

Condon has collaborated with Martin McDonagh in the plays The Lieutenant of Inishmore (2001) and The Cripple of Inishmaan (2009), as well as the films Three Billboards Outside Ebbing, Missouri (2017) and The Banshees of Inisherin (2022).

[4][5] In 2001 at the age of 18, Condon landed the role of Mairead in The Lieutenant of Inishmore by Martin McDonagh which she performed at the Royal Shakespeare Company and in 2006 at the Lyceum Theatre in New York.

[3] She then appeared as Masha, a Tolstoian, in The Last Station, a film about the last months of Leo Tolstoy's life with Helen Mirren and Christopher Plummer, before playing jockey Rosie Shanahan in the 2012 TV series Luck.

Condon appeared in the season 4 premiere of the post-apocalyptic zombie drama The Walking Dead playing the role of the character Clara, which aired 13 October 2013.