About
A small studio that ships whole products.
Appcio was incorporated in 2024 in Saint-Denis, France, on more than a decade of software engineering experience. We build our own product and take on client work that deserves the same standard.
From .NET roots to a full modern stack
Our engineering roots are in the .NET ecosystem — years of C# backends, data models and enterprise integrations. That foundation is still under everything we ship: today it means .NET 10, EF Core and PostgreSQL running behind carefully designed APIs.
Around that core we build with today’s web and mobile stack: React 19 and Next.js on the web, React Native and Expo on mobile — one codebase for iOS and Android — all in strict TypeScript, all deployed through CI/CD onto infrastructure we operate ourselves.
Product-led, and it shows
We are not only a service company: we design, build and operate Fidily, a universal loyalty platform for local merchants. Running our own product keeps us honest about the advice we give — every recommendation we make is one we live with in production.
What we hold ourselves to
Craft over volume
Few projects, done properly: reviewed, tested, documented, and handed over in a state we would want to inherit.
Plain answers
Estimates with reasoning, limits stated up front, and no technology chosen because it is fashionable.
Long-term code
We write software as if we will maintain it in five years — because for our own product, we will.
Tell us what you are building.
One email is enough to start the conversation — what you need, where it runs today, and when you want it live. We reply with questions, not a quote template.