Sébastien Puyet

Part-time CTO. I help companies put AI into production, from scoping to deployment: development, infrastructure, and team upskilling.

For over 10 years, I've been building large-scale IT systems, leading technical teams, and spending most of my time on reliability and performance. Today, I am the founder of fivenines.io, an infrastructure monitoring tool. Before that: CTO of Teeptrak (Winner Scale Up Excellence 2026), Head of Infrastructure, team lead, and senior engineer, from startups to international groups.

Where I get involved:

- Scoping: Where AI truly brings value to your business, and where it doesn't.

- Development: Integrating LLMs, RAG, agents, and automations into your product or internal tools.

- Infrastructure: Sovereign, monitored AI infrastructure with controlled costs.

- Team and processes: Equipping your developers and laying foundations that remain after my departure.

I integrate with your team a few days a month, like an internal CTO, without the cost of a full-time position.

No hype, no complex systems. I deliver what runs in production, and I tell you when an idea isn't worth pursuing.

Describe your context, and I'll respond to everyone.