[citation needed] Rajkumar previously practiced law as a civil rights attorney and worked as an adjunct professor of political science at CUNY's Lehman College in the Bronx.[when?

[11][12][13][14] In 2013, Rajkumar ran for the New York City Council in the Democratic primary in the 1st district in Lower Manhattan, losing to incumbent Margaret Chin.

[25] Rajkumar ran in the primary for the 38th New York State Assembly district in Queens, which includes portions of the Glendale, Ozone Park, Richmond Hill, Ridgewood, and Woodhaven neighborhoods, against incumbent Democrat Michael G. Miller and challenger Joey De Jesus.

[28] Rajkumar defeated Miller and De Jesus in the June 2020 Democratic primary and won over Giovanni Perna in the November general election.

[31] Rajkumar is currently a member of the New York State Assembly from the 38th district, representing Queens neighborhoods of Glendale, Ozone Park, Richmond Hill, Ridgewood, and Woodhaven.

[34] In her first term, Rajkumar passed a legislative package for domestic workers, securing them the full protections of the state human rights law, and expanding their paid family leave benefits.