Joseph Nahed holds an engineering degree from ESME Sudria and an MBA from Institut supérieur de gestion (ISG).
From 2013 to 2020 he was managing director of Groupe Namco, a retail group founded in 1996 that includes the brands À vous de plaire (now Blinky), Gaeco and Olfactivity: 9 stores and €5M in revenue. Alongside this, in 2015 he bought into Symbiose Organisation, a sound, lighting and video company for live events based in Feucherolles, west of Paris; he worked on its turnaround with its managing director until 2019, then sold his stake.
In 2020 he partnered with Nicolas Marche, the volunteer firefighter behind eBrigade, a management software created in 2004 for fire stations, and became chairman of eBrigade Technologies. The software is used by over 1,500 rescue, civil protection and non-profit organisations and has over a million users. The same year he founded Blue Helper, a marketplace for medical, rescue and training assignments, which ran until 2023.
In 2025 he founded NHD, a holding company based in Noisy-le-Roi, near Versailles, which takes minority stakes of 10 to 30% in small and mid-sized businesses with €300k to €5M in revenue, in exchange for hands-on operating support. He currently runs eight companies in real estate, software and media, including RentaPlus, Léa.immo, BodyTrack and Château de Ravenel (Oise).