05/now
I'm Matthys, a React Native and Expo developer in Lille. Here's what I'm actually working on right now: shipping Ekklo full-time, building two side projects, writing, and staying close to the community.
Last updated June 2026
I’m CTO and cofounder of Ekklo, an all-in-one platform for fitness coaches: training and nutrition programs, client tracking, messaging, and payments. The mobile apps are built with Expo and used daily by thousands of coaches and athletes.
A multi-user plant logbook for iOS and Android. Recurring care tasks with local notifications, a dated photo journal per plant, and a Today view that gathers every care task that’s due. Built on Expo SDK 56, Expo Router, and Supabase.
A CLI that runs multiple Expo projects across multiple simulators and emulators in parallel, no more alt-tab dance. It reads each project’s identity, keeps a shared device registry, then routes, boots, starts Metro, and deep-links the dev client. Node.js and TypeScript, MIT-licensed.
I’m writing here on matthys.dev: an MDX blog with shiki-highlighted code, an RSS feed, and a blueprint design built with Next.js, Tailwind, and framer-motion.
I keep my projects on the newest Expo SDK so the work stays current and the apps I ship benefit from the latest of the platform.
Three-time App.js Conf attendee, and co-host of Le Cross Platform Show, the francophone React Native podcast with weshipit.