About

Hi!

My name is Sébastien, but most people call me “Seb”. I’m a software engineer based in Montpellier Saint-Paul, France.

Work

I’m currently working at RAFIKI by NALA as a Lead Backend Engineer to help build the future of financial services and payment infrastructure in Africa.

I was previously CTO at Bloomup, spent summers at Osper, Mendeley and BlueMind and worked as a consultant for various companies in the UK and France.

I’m a fullstack engineer at heart, though I lean heavily toward backend work. My day-to-day revolves around Go, Postgres, AWS and Kafka, building reliable, scalable systems that handle real traffic without drama. I also reach for Rust when performance really matters, and Python when it’s the right tool for the job. Whether it’s designing APIs, wrangling distributed systems or getting deep into infrastructure, I enjoy the whole spectrum.

Interests

Outside of work, I spend most of my time outside in the mountains, on the water or in the air. I’m super passionate about paragliding, kitesurfing, rock climbing and skydiving. When I’m not outside, I’m usually working on some side projects. You can find some of them on the projects page.

Contact

Email: [email protected]
Github: github.com/graphman65
Keybase: keybase.io/graphman
LinkedIn: linkedin.com/in/sebastien-lacoste