Early editing career

After graduating, Giles interned at The New Yorker and then Vogue. She later began working as an editorial assistant at Condé Nast. Giles served as the assistant to Glamour editor-in-chief Cindi Leive before being promoted to assistant editor a year later, and then associate editor at Glamour.^[8] She became the print features editor at Teen Vogue in March 2013.^[4][9] In November 2014, Giles joined Hearst Magazines as digital director at Marie Claire, where she served for three years.^[4][10][11] At Marie Claire she spearheaded features on a wide range of women's topics from profiles of the women who guard our nuclear weapons, to an essay on feminism from Canadian Prime Minister Justin Trudeau.^[12]

Cosmopolitan

In January 2018, Giles was appointed digital director of Cosmopolitan magazine. By the end of May she had revamped the magazine's digital presence.^[7] Cosmopolitan saw an increase in traffic from 15 million visitors a year in February 2018 to 41 million visitors a year later, and digital subscriptions grew 185% from 85,060 to 242,075 between December 2016 and December 2018.^[13] In October 2018, Giles was named editor-in-chief of Cosmopolitan,^[7] becoming the youngest in the history of the magazine to hold the position at the age of 32.^[4] As editor-in-chief, Giles oversees the print magazine, website, video, social, Snapchat and product extensions of the brand.^[8][14]

In 2019, Giles was named Adweek's Editor of the Year.^[15]