After graduating from University of Tokyo, Sawako began her career at Boston Consulting Group. She then joined Google Inc. as an Industry Analyst, advising companies on business managemenet and marketing and working as a part of its online marketing research team. After leaving Google, she worked as a Project Researcher at the University of Tokyo, focusing on cognitive behaviour research. In 2016, she joined AnyPay Inc. as COO and was appointed as CEO in 2018.