What This Stack Does
React Native combined with Expo has matured into the most productive cross-platform mobile development framework available, and pairing it with Cursor AI creates a workflow that feels almost unfairly efficient. Cursor understands React Native's component model, Expo's file-based routing (introduced in Expo Router), and the nuances of platform-specific code — when you ask it to build a screen, it generates properly structured components with platform-aware styling, correct navigation patterns, and appropriate hooks for data fetching. The Expo development experience itself has improved dramatically: Expo Go allows instant previewing on physical devices without a native build step, the new Expo Dev Client supports custom native modules while retaining fast refresh, and EAS (Expo Application Services) handles building, submitting, and updating your app in the cloud. With Cursor's AI agent mode, you can describe a feature in natural language and watch it scaffold the component, create the navigation route, add the necessary TypeScript types, and even generate the Supabase query for the backend data — all in a single agentic loop. The combination is particularly powerful for solo developers and small teams who need to ship iOS and Android apps simultaneously without dedicated native developers for each platform. Cursor's awareness of your entire codebase means it can maintain consistency across screens, reuse your design system components, and follow your established patterns without being explicitly told to do so.
Backend Services: From Auth to Push Notifications
Supabase provides the backend foundation for this mobile stack, handling authentication, database, real-time subscriptions, and file storage through a single platform. For mobile apps, Supabase's authentication system is especially valuable — it supports email/password, magic links, phone OTP, and social providers (Google, Apple, GitHub, Facebook) out of the box, with the @supabase/supabase-js client library handling token refresh, session persistence, and deep linking automatically. The real-time subscription feature is transformative for mobile apps that need live updates: chat applications, collaborative editors, live dashboards, and notification feeds can all be built using Supabase's real-time channels without managing WebSocket connections manually. Row-level security policies ensure that each user can only access their own data, which is critical for mobile apps where the client is inherently untrusted. Supabase's storage system handles file uploads with automatic image transformations — you can upload a user avatar and request it at different sizes and formats on the fly, which is essential for mobile apps that need to optimize image loading for different screen densities. The Supabase local development experience via the CLI means you can develop and test your entire backend offline, running PostgreSQL, authentication, storage, and edge functions on your local machine with full parity to production.
Firebase remains an essential part of the mobile stack even when using Supabase as the primary backend, because Firebase excels at two things that Supabase does not currently offer: push notifications via Firebase Cloud Messaging (FCM) and mobile analytics via Google Analytics for Firebase. FCM is the de facto standard for push notifications on both iOS and Android — it handles device token management, topic-based subscriptions, notification scheduling, and delivery reporting across both platforms with a single API. Integrating FCM with a Supabase backend is straightforward: you store device tokens in your Supabase database, and when an event occurs that should trigger a notification (new message, order update, friend request), a Supabase edge function calls the FCM API to deliver the push notification. Firebase Analytics provides mobile-specific event tracking that goes far beyond what web analytics tools offer — it tracks screen views, user engagement time, crash-free sessions, and user properties with automatic cohort analysis. Firebase Crashlytics adds real-time crash reporting with stack traces, device information, and breadcrumb logs that help you diagnose issues in production. The combination of Supabase for core backend functionality and Firebase for notifications and analytics gives you the best of both platforms without the lock-in that comes from using Firebase as your sole backend.
The Serverless API and Edge Layer
Vercel serves as the API hosting layer in this stack, providing a serverless platform for the API routes that sit between your mobile app and your backend services. While Supabase handles direct database access and authentication, many mobile apps need custom API endpoints for business logic that does not belong in the client — payment processing, third-party API integrations, data aggregation, webhook handling, and complex validation logic. Vercel's serverless functions, written in TypeScript and deployed automatically from your Git repository, provide the perfect home for this logic. Next.js API routes on Vercel give you type-safe endpoints with middleware support, automatic HTTPS, edge caching for read-heavy endpoints, and global distribution across Vercel's edge network for low-latency responses worldwide. For mobile apps, latency matters enormously — users expect instant responses, and Vercel's edge functions can serve cached responses in under 50 milliseconds from the nearest point of presence. You can also use Vercel to host your app's marketing website, documentation, and admin dashboard, keeping your entire web presence on a single platform while your mobile app communicates through the API layer. The deployment workflow is seamless: push to your main branch and Vercel builds and deploys automatically, with preview deployments for pull requests that let you test API changes before they hit production.
Testing, CI/CD, and the Path to Production
Testing mobile applications has historically been painful, but Playwright has expanded beyond web browsers to support mobile testing scenarios that cover the most critical user flows. While Playwright does not run tests on native iOS or Android simulators directly, it excels at testing the web views, API interactions, and responsive layouts that make up a significant portion of modern React Native apps — especially those using Expo's web export. For API-level testing, Playwright's request context lets you write end-to-end tests that authenticate against your Supabase backend, create test data, exercise your Vercel API routes, and verify the complete request-response cycle without a browser. For UI testing, Playwright can test your app's web version (React Native Web via Expo) across Chrome, Firefox, and Safari with mobile viewport emulation, touch event simulation, and geolocation mocking. This gives you confidence that your shared React Native components render correctly across platforms. For native-specific testing, the stack recommends complementing Playwright with Detox or Maestro for on-device testing of platform-specific features like push notifications, camera access, and biometric authentication. The key insight is that a large percentage of mobile app bugs are logic bugs that can be caught with API and web-based testing — reserving expensive native testing for platform-specific features keeps your test suite fast and maintainable.
The CI/CD pipeline powered by GitHub Actions ties this entire stack together into an automated release workflow that eliminates manual build and deployment steps. A well-configured GitHub Actions workflow for a React Native Expo project includes multiple stages: linting and type checking with TypeScript, running Playwright tests against your API and web export, building native binaries using EAS Build (Expo's cloud build service), and submitting to the App Store and Google Play via EAS Submit. GitHub Actions integrates natively with EAS through the expo/expo-github-action, which handles authentication, build triggers, and status reporting within your pull request workflow. For your API layer on Vercel, GitHub Actions can run integration tests against preview deployments before promoting to production — the Vercel GitHub integration creates a unique URL for each pull request, and your Actions workflow can run your Playwright test suite against that URL. Environment management is handled through GitHub Actions secrets and environment protection rules, ensuring that production credentials for Supabase, Firebase, and the app stores are only accessible to deployment workflows on the main branch. The recommended branching strategy is trunk-based development with short-lived feature branches: each pull request triggers a preview build that can be tested on physical devices via EAS Update (over-the-air updates), and merging to main triggers the full build-test-deploy pipeline. This workflow enables small teams to ship multiple app updates per week with confidence, knowing that every change has been automatically tested and built in a reproducible environment.