Before joining Omnes, Fabien co-founded his own startup, and that builder background shows up in how specific his advice to founders is—he talks about weak signals investors pick up on, like whether past backers reinvest or how polished a startup's deck and website look, and he pushes founders to line up a list of about ten target funds and plan for a pessimistic runway well before they start raising. His work spans some of the most technical corners of venture, from cybersecurity companies like Sekoia and Antelop Solutions, later acquired by Cisco and Entrust, to quantum and drug-discovery startups like Quandela, Qubit Pharmaceuticals, and Iktos, a mix that fits his engineering and finance background from CentraleSupélec and Imperial College London.