When she was 16, Sosa intended to further her education in communication studies in Santo Domingo, but while walking in Copey with her family, designer Luis Menieur, her mother's agent, spotted her.

[6] Sosa dove head-first into the fashion industry, with Anna Wintour sending her to the Met Ball during her first week in New York.

[7][8] Sosa made her runway debut for Banana Republic's fall/winter 2008 collection, and she later walked for the Dior Resort show and opened for Oscar de la Renta.

[1] Sosa has walked for some of the most prestigious designers and fashion houses in the world, including Shiatzy Chen, Ralph Lauren, Michael Kors, John Galliano, Emanuel Ungaro, Hussein Chalayan, Alexander Wang, Jean Paul Gaultier, Hermes, Bottega Veneta, Anna Sui, Carolina Herrera, Donna Karan, Tsumori Chisato, Jason Wu, Carlos Miele, Derek Lam, Isaac Mizrahi, Matthew Williamson, Narciso Rodriguez, Ruffian, Tadashi Shoji, Iceberg, Mariella Burani and Diane von Furstenberg.

She has appeared in advertising campaigns for David Yurman, Topshop, Polo Ralph Lauren, Express, Lancôme, and GAP.