Joss Caron
Updated August 2026- QuarticFounding studioSince 2013
20+ products shaped, 8 rounds raised
Campus CoachBootstrapped2024 → 2025
CO2 AISeries A, out of BCG2023 → 2024- Comet10,000 tech experts2021 → 2023
AgoraPulse€2M to €10M ARR in two years2017 → 2019
Qonto13th employee2017
Lab
SwelvReading made social. A book app where what you read becomes something you share, and reading stops being a chore.2026- Coming soon
GanshoA desktop job tracker that reads your inbox and fills its own board. Your API key, your machine, nothing leaves it. - Coming soon
PeekpadA Raycast extension for the AI agents I run: projects, activity, cost, and how much of the week I have left.
Questions
So you have mostly worked freelance?
Half and half. Qonto, AgoraPulse and CO2 AI were salaried positions. The rest went through Quartic, my practice, as long-term partnerships: five years and eight months with anagram, almost two years with Comet, a year with Campus Coach. The contract changed, the commitment did not.
You have only worked with young companies.
Early on, yes, mostly companies looking for product-market fit. Then companies looking to scale. Up to Gorgias, three hundred people, where I worked with the design team to bring a new brand into their design system. And DINUM, the digital agency of the French state.
B2B or B2C?
Both, and sometimes B2B2C. B2B: Qonto, AgoraPulse, CO2 AI, Comet, Gorgias, Cycle. B2C: Campus Coach, a paid running coach subscription, and Luko, home insurance.
Desktop or mobile?
Desktop at the start of my career, then a lot of mobile, up to leading an iOS, Android and Apple Watch app. Campus Coach lives outside, in the rain, on a phone you glance at mid-run. CO2 AI is a dense desktop tool where a single screen holds a company's entire supply chain. The constraints have nothing in common, and that is the point.
Are you a craft designer, a UX designer, or something else?
A product designer with two specialties. Financial niches, where the rules are shaped by regulation: business banking at Qonto, home insurance at Luko, carbon accounting at CO2 AI, freelance pay at Comet. And health, since Campus Coach: the gap between what people want and what their body allows. I like taking flows apart to improve them, and I ship screens with attention to detail.
You never stay long.
I have never failed a trial period, and I have never left an engagement unfinished. Several ended because the budget ended, Comet and Luko for instance. When I left on my own, it was because craft had stopped being a priority. I also had my younger years, and the urge to meet and understand many subjects. For a few years now I have been after the opposite: settling into a single one for a very long time.
Why would you stay?
For a place where shipping high-quality screens is a passion and where people look for depth in what they do, where every feature answers a real user need as much as a business intent, and where the team challenges you.