1995 to 2000: Assistant, Associate Professor at the Algebra Department, Mathematics Faculty, Moscow State Pedagogical University (MSPU);
Since 1999: Junior Researcher, Assistant, Associate Professor, Professor at the Department of Higher Algebra, Faculty of Mechanics and Mathematics, Lomonosov Moscow State University;
Since 2013: permanent-position professor at the Independent University of Moscow (IUM);
2012 to 2014: head of the Academic programmes group at Yandex;
2013 to 2014: Professor, Head of the Joint Department with Yandex at the Department of Applied Mathematics and Informatics of the National Research University Higher School of Economics;
Since 2014: Dean of the Faculty of Computer Science, National Research University Higher School of Economics
Ivan Arzhantsev authored 48 scientific papers, 4 textbooks and one monograph. He prepared 10 Candidates of Sciences. He is the recipient of the Academy of Europe Award for Young Russian Scientists (2006), grant of the President of the Russian Federation for young Candidates of Sciences (20042005), Pierre Deligne grant (20082010), grant of the Ministry of Education and Science of the Russian Federation (20122013), Dynasty Foundation grant for young Doctors of Sciences (20122014), Basis Foundation grant for leading scientists in the field of fundamental mathematics (20182020).
Lomonosov Moscow State University, Faculty of Mechanics and Mathematics (1995)
Doctor of Sciences in Physics and Mathematics (2010).
Chairman of the Management board of Otkritie FC Bank