lee was the workers' party's deputy treasurer from 2008 to 2011, the party's youth wing president from 2011 to 2012 and the deputy webmaster from 2012 to 2014. since 2014, she has been the organising secretary on the party's executive council. prior to her election to parliament, she also served as a legislative assistant to pritam singh, who he was now the secretary-general of the party since 2018, and as an mp of the aljunied group representation constituency (which the party first captured the constituency in the 2011 general election.