The Reality of Deeptech with Sandra Rey (Glowee)

What Can Entrepreneurs Learn from Building and Losing a Deeptech Startup?

Building a deeptech startup requires resilience, scientific ambition, strategic fundraising, adaptable leadership, and continuous learning. Even when a company fails, founders gain experience that shapes future entrepreneurial success.

Why Deeptech Entrepreneurship Is Different

Building a deeptech startup means transforming scientific innovation into a viable business—a process that often takes years of research, funding, and technical development.

In this episode of Épitaphe, Sandra Rey, founder of Glowee, shares what she learned after spending a decade developing bioluminescent lighting technology inspired by nature. Her journey reveals the realities of deeptech entrepreneurship beyond the headlines.

From Bold Vision to Global Recognition

At just 22 years old, Sandra Rey set out to replace traditional urban lighting with living, bioluminescent light.

Despite having no background in biotechnology, she:

Founded Glowee.
Built a scientific team.
Raised funding.
Gained international media attention.
Established herself as one of France's most recognized deeptech entrepreneurs.

Her story demonstrates how ambitious ideas can attract talent, investors, and global interest when supported by a compelling vision.

The Challenges of Scaling a Deeptech Startup

Scientific innovation alone is not enough to build a sustainable company.

Sandra discusses the challenges many deeptech founders encounter, including:

Long research and development cycles.
Complex fundraising processes.
Technology pivots.
Dependence on public funding.
Balancing scientific progress with commercial execution.

The episode highlights how deeptech companies face different constraints than software startups, requiring patience, capital, and long-term strategic planning.