My web-based CRM is already running smoothly in production; now I need a mobile companion that covers the same day-to-day workflows on both iOS and Android. The apps must continue functioning when users lose connectivity, queuing any changes locally and syncing them automatically once a connection is restored. Key points • Single sign-on with the existing web credentials so the user experience feels seamless. • All screens, forms, and lists should draw data from the current REST/JSON APIs (or you may propose GraphQL if you see clear advantages). • When offline, users should still be able to browse cached data, create or edit records, and receive visual cues that their updates are pending. • Sync logic has to manage conflicts gracefully and keep the local store lightweight. • Push notifications need to relay reminders and status updates exactly as the browser version does. I’m open to React Native, Flutter, or fully native Swift + Kotlin as long as the final builds pass App Store and Play Store review without issues and the codebase is easy for my in-house team to maintain. Deliverables 1. Source code with clear modular structure and inline documentation. 2. Test-flight/alpha builds for review on both platforms. 3. A concise setup guide so my developers can run the project locally and handle future updates. 4. Live apps published under my existing developer accounts. If you have shipped offline-first mobile apps before, I’d love to see a short portfolio link and your preferred tech stack.