Julien started as a programmer on the Atari Jaguar in the early 90s at Shen Technologies in Paris. He then joined Ubisoft Entertainment to work in game and engine teams before becoming the worldwide technical director of Ubisoft Entertainment in 1999. In this role, he played a major part in the studio’s creation, organization, technology, production pipeline design, and multi-platform strategy, as well as in AAA features integration, on brands such as ‘Rayman’, ‘Far Cry’, ‘Splinter Cell’, ‘Prince of Persia’, and ‘Assassin's Creed’. He also took responsibility for middleware and development strategy, communication and cooperation strategy, and hardware manufacturers and middleware relations.
At the end of 2005, after having worked extensively on PS3 / XBox360 / PC, Julien pursued his career at Eidos, where he served as the worldwide CTO working on the technology strategy, as well as leading initiatives like the creation of Eidos Montreal and Eidos Shanghai Studios. Julien became the worldwide technology director for Square Enix Group in 2009, working on a wide variety of engines and franchises including ‘Tomb Raider’, ‘Final Fantasy’, ‘Hitman’, ‘Deus Ex’ and ‘Kingdom Hearts’. In 2013, he joined Konami as the worldwide technology director to oversee Fox Engine, work directly on the acclaimed ‘Metal Gear Solid V: The Phantom Pain’, and help advance many games in the group including ‘Pro Evolution Soccer’ 2015 and 2016 that - these years - caught up with its competitor Metacritic.. Julien joined Bandai Namco Studios end of 2015, where he now serves as their worldwide technology director.