[1] Sergeev's career began in the legal department of Alfa-Bank in the early 2000s but soon shifted toward media management.
[3][1][4][5] In January 2014, Sergeev was appointed executive director of VK, responsible for the financial management of the social network.
He has partnered with the international Downside Up Foundation and helped launch sports, employment, and volunteering projects.
He also works on public campaigns that create a positive image of people with mental disabilities in society.
He produced an "Eating an Elephant" documentary about theater actors with Down syndrome and a "Small Andrew's Diary" animated movie about a boy with a mental disability.