Tania's mother is French, and her father is of American-Russian descent. Due to her French heritage, Tania can speak fluent French.
Her first big acting role was in the TV series Malcolm in the Middle playing the recurring character of Cynthia Sanders. She appeared in five episodes between 2000 - 2002. In 2002 she starred in the film Children on Their Birthdays and in 2003 she played Lauren O'Keefe in the sitcom The O'Keefes which only lasted for 7 episodes.
Over the years she has appeared on several television shows including Providence, The Brothers Garcia, The Nightmare Room, That's So Raven, The Guardian, NCIS and Bones (with Tamara Taylor). In 2006 she wrote and directed the short film 'Cell Division', in 2007, she was featured in the Maroon 5 music video "Won't Go Home Without You."
She starred as an accent-loving waitress in the 2008 comedy 'Still Waiting,' the sequel to the 2004 comedy 'Waiting' starring Justin Long and Ryan Reynolds. in 2009, she played lead roles in the feature films 'Wild Cherry' and 'Elsewhere'. She features in the indie film "The Immaculate Conception of Little Dizzle" released in 2010.
2011 was a productive year for Tania, as she appeared in 3 feature films, 'Trophy Kids', 'Chillerama' and 'Losers Take All', as well as a short film, 'Red Alert'. She was a leading character on MTV's Horror/Comedy television series 'Death Valley', and made a guest appearance on 'Hawaii Five-0' alongside fellow Lost alumni Daniel Dae Kim and Terry O'Quinn.
In 2012 she starred in and was an associate producer on the feature film 'Blue Like Jazz', the next year Tania appeared in the Lionsgate feature film 'Texas Chainsaw 3D', the remake of the cult horror hit 'The Texas Chainsaw Massacre', playing Nikki.
- Playing the role of Alex Rousseau required Tania to wear blue contact lenses since her eyes are naturally brown.
- In 2011 Raymonde won the 'Best of the Best Ensemble Cast Award' at the Breckenridge Festival of Film, along with the rest of the cast, for 'Trophy Kids'.