She has played Cody LeFever in the ABC prime time soap opera Blood & Oil, Dr. Anna Ziev in the Hulu romantic comedy series The Mindy Project,[2] and Maggie in the Into the Dark television film episode "The Body".

Later in that year, Rittenhouse was cast in the series regular role as Brittany Dobler in the Fox comedy-drama, Red Band Society.

[8] Rittenhouse was originally considered for the female lead role in the superhero film Deadpool, but lost the part to Morena Baccarin.

[10][11][12] In late 2017, she was cast as Keri Allen in the season seven finale of the legal drama series Suits, which served as a backdoor pilot for a potential spin-off, Pearson.

[14] Rittenhouse recently starred as interior decorator Ainsley Howard in the Hulu miniseries Four Weddings and a Funeral, a modern update on the 1994 British film of the same name, created by Mindy Kaling and Matt Warburton.