Born in Romania in 1977. He graduated in the filmmaking department of media at the University of Bucharest. In 2009, he made his debut in feature films direction with The Happiest Girl in the World. From him, Mostra presented the feature films Aferim! (2015), winner of the Silver Bear for best director at the Berlin International Film Festival, Scarred Hearts (2016), winner of Special Jury Prize at Locarno, and I Do Not Care if We Go Down in History as Barbarians (2018), best film at Karlovy Vary.