Hsu began her career in experimental theatre and comedy. From 2013 to 2015, Hsu made regular appearances on the MTV reality comedy series Girl Code. She landed her first recurring television role as Joy Armstrong in the Hulu series The Path.
Hsu was called in for the first table reading of The SpongeBob Musical in 2012 to read for Karen, the anthropomorphic computer. She would go on to play the character on stage in Chicago in 2016 before making her Broadway debut in 2017.
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