Cross-Platform Mobile and Web Architecture with Next.js, React Native, and Firebase

Building an enterprise collaboration tool like FlowTrack requires delivering seamless experiences across desktop web browsers and native mobile smartphones (iOS & Android).

Rather than writing completely disconnected codebases, a shared architecture with Next.js, React Native, and Firebase enables maximum code reuse and unified data synchronization.

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1. Code Sharing Strategy in a Monorepo

• Shared Logic (85% reuse): TypeScript types, API client services, validation schemas (Zod), and state stores (Zustand).
• Platform Specific (15% adaptation): Presentation components (HTML/CSS vs Native View/Text elements).

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2. Firestore Offline Persistence

Firebase Firestore provides native offline persistence on mobile and web:

import { initializeFirestore, persistentLocalCache } from 'firebase/firestore';
export const db = initializeFirestore(app, {
  localCache: persistentLocalCache()
});

With persistent local caching enabled, users can manage tasks, log time, and organize projects even when disconnected from the internet. When connection resumes, Firestore automatically synchronizes local mutation logs with the cloud database.
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