On 11 July 2021, after establishing himself as a regular starter for Alcorcón B, Barbu was loaned to Primera División RFEF side Real Unión for the season.[2] He was a first-choice during most of the campaign, as his side narrowly missed out a play-off spot.
On 29 July 2022, Barbu signed a three-year contract with CD Mirandés in Segunda División.[3] He made his professional debut on 22 October, starting in a 1–1 home draw against SD Huesca.[4]
Barbu scored his first professional goal on 21 November 2022, netting his team's second in a 2–1 home win over FC Cartagena. On 29 August 2024, he terminated his link with the Jabatos.[5]