In 2017, siblings Supak and Suvinai Inthasoi founded SI Architecture and Construction in their hometown. Supak received a bachelor's degree in Architecture from Kasetsart University, Bangkok, Thailand. Supak worked as an architect for an architecture firm in Bangkok and later went on to study for a master's degree in the United States. Supak graduated from The University of Oklahoma with a master's degree in Interior design. The program focuses on sustainable living. After studying for a master's degree, Supak intern in the United States before returning to Thailand and establishing her own company.

Suvinai received a bachelor's degree in Architecture from Mahasarakham University. After he finished his bachelor's degree, he works for several architecture firms before founding his own company. He is now continuing his studies toward his master's degree in Architecture with a focus on Building Technology at Khonkaen University, Thailand.