After initial training in woodworking, Julien Plessis continued his studies at the Grenoble School of Architecture, earning a master's degree in design (2004) and a DPLG architect's diploma (2005). In 2018, he furthered his education with a university diploma in environmental quality project management.
Following his architect's diploma, he gained fifteen years of experience in architectural firms as a project manager. He took on significant responsibilities for large projects such as the EQHO Tower in La Défense and complex projects like the digital hub in Saint Denis.
In 2020, he founded the Métrotope architecture agency. With his unconventional background, he retains a practical mindset and a passion for hands-on thinking, where theory and practice seamlessly blend.