Siti made her debut as a full-time theatre actress after attending The Necessary Stage’s Theatre for Youth Ensemble programme in 2003. She has since worked with a wide range of theatre companies, both locally and internationally.

She won the Best Actress Award twice at The Straits Times Life! Theatre Awards for her performances in Model Citizens (2010) and Off Centre (2015). She was awarded the Young Artist Award by the National Arts Council in 2014. Siti K won best actor in a comedy role at the Pesta Perdana Awards 2023 and in 2024 came out champion in the singing competition, Berani Nyanyi on Mediacorp’s Untukmu channel.