Compras App
Real-time shared shopping list
Mobile app to share the shopping list in real time across devices. React Native + Expo, custom Node.js backend with Socket.io and MongoDB Atlas. In real daily use.
The problem
At home we kept buying duplicates or forgetting what was missing: paper lists and scattered notes never stayed in sync between us.
The solution
Native Android app with instant cross-device sync over WebSockets. Custom Express/Socket.io backend with MongoDB Atlas, auth and shared lists. Deployed on my home NAS with Docker, Nginx, automatic SSL (Let's Encrypt) and CI/CD via GitHub Actions + EAS Update.