Jančić sought election to the Assembly of Vojvodina in the 2008 provincial election as a candidate of the Serbian Radical Party in the Novi Kneževac division. He was defeated in the second round of voting by Jovanka Petrović, a candidate endorsed by the Democratic Party.[3] The Radical Party split later in 2008, and Jančić joined the breakaway Progressive Party.
Jančić received the seventy-sixth position on the Progressive Party's Aleksandar Vučić – Serbia Is Winning electoral list in the 2016 Serbian parliamentary election and was elected to the assembly when the list won a landslide victory with 131 out of 250 mandates.[4] He is currently of member of the parliamentary committee on agriculture, forestry, and water management; a deputy member of two other committees; and a member of the parliamentary friendship groups for Austria, Belarus, France, Georgia, Israel, Kazakhstan, Russia, and Switzerland.[5] He is also active in municipal politics in Novi Kneževac[6] and was re-elected to the municipal assembly in the 2016 Serbian local elections.[7]