Julien started his career as a graphic designer in the early 2000s, during the golden age of Flash, on which he created his first games. He then spent 20 years freelancing for hundreds of clients in all sectors of the economy. In 2016, he met Thomas Panuel and the two decided to develop the first game of what would become Rundisc Studio two years later. In 2023, the success of Chants of Sennaar, their second game, allowed him to join the studio full time.