Johanna graduated from Gadjah Mada University Law Faculty majoring in Business Law. She had previously worked as an intern in one the prominent law firms in Jakarta, and the Embassy of the Republic of Indonesia in Singapore.
During her time in college, Johanna was actively involved in an international moot court community and had taken part in numerous moot court competitions. She was also a member of the Asian Law Students Association (ALSA). Johanna had also taken a certification course on taxation.
She speaks Indonesian and English.