Cyndie worked hard at racing, claiming junior championship titles in Switzerland and Europe in 1999 and 2000. She then drove for a kart factory team in 2003 and moved to single-seaters in 2004 in Formula Renault, before going to Formula 3 in 2006. She was also part of the Mercedes Junior Team from 2004 to 2008. From the German Formula 3 and Formula 3 Euroseries, Cyndie went on to Indy Lights and did testing with DTM and LMP2 cars. In 2010, she raced the 24 hours of Le Mans with a Ford GT1 and came in third for the 1000km of Spa-Francorchamps.