[citation needed] She began her career in 2003 on Rede Bandeirantes as the editor of international news for Jornal da Band.

She was a reporter and, eventually, presenter of Jornal da Band, alongside journalist Ricardo Boechat.

She made special reports, interviews with presidential candidates, participated in the electoral calculations, political sabbaths, in the main journalism coverage and anchored the news programs SBT São Paulo (2012), SBT Brasil (2009-2011), Jornal do SBT (2012-2016) and Primeiro Impacto (2016).

[3][4] Since March 2020, she has presented the podcast Melhor da Vida (Best of the Life),[5] which addresses health and well-being, featuring interviews with experts and mixing information and quality music (classical, jazz and Brazilian instrumental).

[6] Since 2012, Karyn is married to the dental surgeon André Loureiro,[7] with whom she has two children: Eduardo and Rafaela, born in 2014 and 2018, respectively.