Cross-Platform Social Networking App

I’m ready to turn a new social network idea into fully functioning Android and iOS apps. The concept is still feature-light on paper, so I need someone who can guide me through best-practice decisions, propose a sensible architecture, and then build the core experience.

The essentials:
• One codebase (preferably React Native, Flutter, or another robust cross-platform framework) that outputs polished apps for both stores
• A clean, modern UI that can scale as new features roll in
• Solid, secure back-end (Firebase, AWS Amplify, or your recommended stack) with user data handled to industry standards

I’ll provide the branding, initial wireframes, and workflow notes. From you I want:
1. Technical recommendations with clear reasoning
2. A staged development plan (MVP first, feature iterations after)
3. Source code, build instructions, and testable deployments for Android & iOS
4. Ongoing support for the first submission round to both app stores

If you’ve shipped social apps before and can demonstrate reliable cross-platform expertise, let’s discuss timelines and next steps.