Kim was born and raised in Arlington, graduating from Yorktown High School. Public service is a family tradition; her mother served in the Commonwealth Attorney's office, and her father was an Arlington County Firefighter, the second of four generations to wear that uniform.

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Kim joined the Treasurer's Office in 1990, rising through the ranks and spending more than a decade leading the Compliance Division. In 2014, Treasurer Carla de la Pava selected her as Chief Deputy Treasurer. Kim holds a Master Governmental Deputy Treasurer certificate from the University of Virginia's Weldon Cooper Center for Public Service and is a graduate of Leadership Arlington's Class of 2019.

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Kim has dedicated many years to supporting youth sports in her community. She has been an active volunteer with Arlington Little League and Arlington Travel Baseball and has played a leadership role with the Yorktown Baseball Boosters, where she served as both President and Treasurer.