Prastieto graduated from University of Indonesia Law Faculty majoring in Business Law. While in college, Prastieto was actively taking part in national moot court competition. In addition, he was also a member of the Business Law Society of the University of Indonesia.
Before joining Budidjaja International Lawyers, Prastieto had worked at a major law firm in Jakarta, and a prominent telecommunication company. He had also involved in the University of Indonesia legal aid institution.
Prastieto speaks Indonesian and English.