In July 1795 he joined the Yekaterinoslav Governorate administration as its chief architect; in particular, in the Crimea Hastie surveyed the Bakhchisaray Palace and other Tatar and Greek relics.
Hastie became part of the Yekaterinoslav Governorate administration in July 1795, where he served as the main architect. He was particularly tasked with examining the Bakhchisaray Palace and other historical artifacts from the Tatars and Greeks in Crimea.