On 11 July 2008, Barthe signed a four-year contract with Bulgarian side Litex Lovech after impressing during a short trial period.

[4] During the 2011–12 A PFG season, he formed a partnership with Ľubomír Guldan in the centre of defence and became an established first team player.

At the end of the season, Barthe became the first foreign player to win five consecutive A PFG titles, as Ludogorets clinched their third championship in a row.

On 12 June 2015, Barthe signed a three-year contract with the Swiss record champion Grasshopper Club Zürich.

[8] On 8 September 2017, Barthe made his debut for CSKA Sofia in 3 – 0 home win against Vereya (Stara Zagora), making an appearance in the 85-th minute, replacing Nikolay Bodurov.