Building Promus at the Mistral AI Worldwide Hackathon

Mistral AI ran their first worldwide hackathon across 7 cities simultaneously from February 28 to March 1, 2026. I joined the Paris edition with Daniel to build something in 36 hours.

The Mistral AI Worldwide Hackathon banner at the Paris venue, showing February 28th to March 1st 2026 — The Paris venue.

The Event

The scale was something different from the local hackathons I was used to. The same event was happening in parallel across Paris, London, New York, San Francisco, Singapore, Bangalore, and Tokyo. The Paris edition alone brought together over 100 selected engineers. Sponsors included Mistral AI, Hugging Face, Weights & Biases, Nvidia, AWS, and White Circle.

Participants gathered outside at the Paris hackathon venue — Participants at the Paris venue.

Hundreds of people, opening talks, and the kind of energy that only shows up when everyone in the room is working on something under a deadline. It was my first hackathon outside of my home city, and that shift in setting made a real difference.

Attendees listening to a presentation during the hackathon — During one of the talks.

Promus

We built Promus: an AI agent that autonomously executes to-dos across professional tools. You connect your LinkedIn, Gmail, WhatsApp, Telegram, and other accounts, add tasks to your list, and Promus handles the execution. The idea was to close the gap between having a to-do list and actually getting things done.

The source code is on GitHub.

Paris

Doing a hackathon in another city adds a layer to the whole experience. You arrive somewhere new, you're surrounded by people from all over, and everything feels a bit bigger than usual. I like Paris, so that helped. Walking past the Seine at night after a long day of building is not a bad way to clear your head.

The Eiffel Tower lit up at night, viewed from a bridge over the Seine — Paris at night.

This was the biggest hackathon I had done. New connections, new ways of thinking about what AI agents can do, and a reminder that sometimes the best thing you can do is show up somewhere new and build.