Mobile-First Stack (React Native/Flutter, Firebase, GraphQL, Expo) overview

A mobile-first application stack: React Native or Flutter as the cross-platform UI framework, Firebase as the managed backend providing authentication, real-time database, cloud functions, and push notifications, GraphQL as the API query language for flexible client-driven data fetching, and Expo as the development and build toolchain for React Native. This stack prioritizes mobile development velocity. React Native and Flutter both enable single-codebase development for iOS and Android. Firebase eliminates the need for a custom backend for common mobile patterns (auth, real-time sync, file storage, crash reporting). GraphQL reduces over-fetching on bandwidth-constrained mobile networks by letting the client specify exactly which fields it needs. Expo provides over-the-air updates, managed builds, and a rich set of native module wrappers. The combination is popular for startups and indie developers shipping consumer mobile apps with small teams.