After completing his PhD, Sergei worked as a postdoctoral researcher at the Dresden University of Technology; in Paris (where he held the Diderot fellowship from Maison des Sciences de l'Homme); and at the University of Pretoria. He also has industrial experience as a software engineer and data scientist. His research covers topics in data analysis and artificial intelligence, including logical and algorithmic aspects.
He is an author of the book “Conceptual Exploration” written together with Bernhard Ganter, one of the founding fathers of formal concept analysis.