Junior William Joyant
Nice-based entrepreneur, founder of Oneera and Teufy
Junior William Joyant is a 24-year-old entrepreneur based in Nice. Born in Haiti in 2002 and adopted at four, he grew up in Clermont-Ferrand before moving to the French Riviera on his own at 19. He founded Teufy, a going-out app listing parties, festivals and deals on the French Riviera, then Oneera, a company that builds real-time maps of festivals, clubs and other venues open to the public.
Before starting his companies, he worked for Taxi Nice Riviera and Riva Boat Services in Saint-Tropez, then ran VIP operations, backstage and guest services at major Cannes nightlife venues.
He holds a master's degree in cybersecurity and is studying for a master's in event management. He also owns 90% of an IT and cybersecurity agency set up in 2022 and 70% of a private events agency based in Monaco since 2023. His stakes are valued at between €2.5 million and €4 million.
Key facts
- Age
- 24 (born 2002)
- Background
- Born in Haiti, adopted at 4, grew up in Clermont-Ferrand; moved to the French Riviera on his own at 19
- Occupation
- Entrepreneur in tech and events
- Companies
- Oneera (2026, 70%), Teufy (2021, 80%), an IT and cybersecurity agency (2022, 90%), a Monaco events agency (2023, 70%)
- Education
- Master's degree in cybersecurity; master's in event management under way
- Business holdings
- Stakes valued at €2.5m to €4m
- Based in
- Nice (Alpes-Maritimes)
- Official profiles
- LinkedIn, Instagram @junior_joyant
Frequently asked questions
Who is Junior William Joyant?
Junior William Joyant is a 24-year-old entrepreneur based in Nice. He founded Teufy, a going-out app launched in 2021, and Oneera, a company that builds real-time maps of venues open to the public, set up in 2026.
What is Junior William Joyant's estimated net worth?
His business holdings are valued at between €2.5 million and €4 million. The figure is based on the reference valuations of his four companies, in which he holds majority stakes, and on buyout proposals received for some of them.
Which companies does he run?
He holds majority stakes in four companies: Teufy, launched in 2021 (80%), an IT and cybersecurity agency set up in 2022 (90%), a private events agency based in Monaco since 2023 (70%) and Oneera, registered in May 2026 (70%).
Where does Junior William Joyant come from?
Born in Haiti in 2002, he was adopted at the age of four and came to France that same year. He grew up in Clermont-Ferrand, then moved to the French Riviera on his own at 19.
What is his educational background?
He holds a master's degree in cybersecurity and is studying for a master's in event management.
Where is he based?
He lives and works in Nice, in the Alpes-Maritimes, where he runs his companies.