Before the Revolution
Before the Revolution, he lived and worked in St. Petersburg. In 1906, he entered the Charitable Office of Empress Maria, simultaneously maintaining a private practice. Nicholas Vassilieve's primary activity was working on architectural competitions, of which he won over 90 before the Revolution. He frequently collaborated with fellow architects and former classmates. Vassilieve's outstanding creativity and imagination dominated most of his collaborative work, as his colleagues were left to finesse the plans and determine the structural engineering of the project.