During his former career as an advertising salesman, Julien trained in evening classes at Acting International. On television, he appeared in the third season of Baron Noir (Antoine Chevrolier) for Canal+. He also filmed in Notre-Dame, la part du feu (Hervé Hadmar) for Netflix, and for France Télévisions, he played Roland Peugeot in the series Le Rapt de Ségolène Chaplin and Bruno Le Maire, a former french economy minister in Le jour ou la France a dit non (Marine Suzzoni). In theater, he performed in Déjà-vu (Renaud Fulconis), Danser à Lughnasa by Brian Friel (directed by Eva Freitas), and portrayed Jay Gatsby in the immersive show The Great Gatsby, at the Palais de la Méditerranée in Nice for two summer seasons. In 2025, he played the role of prosecutor Robert Godefroy in Louis Barraud's play Landru: Je n'ai rien à vous dire, which reenacts the trial of the infamous serial killer, in courts and theaters throughout France. Julien is also the creator of La Guerre des Hachoirs , his first original play in whicj he plays several characters. Julien is also an improviser, having trained with the Paris Improv League.