An economist and entrepreneur based in Čačak,[1] Mijailović is the owner and general manager of the Serbian company British Motors.

[3] In December 2017 he indicated that the latter organization was badly in debt and threatened by bankruptcy.

He served on the Čačak city council (i.e., the executive branch of the municipal government) with responsibility for small and medium-sized businesses and was at one time a prominent ally of mayor Vojislav Ilić, the brother of New Serbia leader Velimir Ilić.

[5] He received the 116th position on the Progressive Party's Aleksandar Vučić – Serbia Is Winning list in the 2016 Serbian parliamentary election and was elected when the list won a majority victory with 131 out of 250 mandates.

[6] He is currently a deputy member of the parliamentary committee on the [Serbian] diaspora and Serbs in the region; a deputy member of the committee on the economy, regional development, trade, tourism, and energy; and a member of the parliamentary friendship groups with Austria, China, Croatia, Cuba, Germany, Italy, Macedonia, Montenegro, Russia, Slovenia, Spain, and the United Kingdom.