Cross-Platform Social Networking App

I am ready to kick-off the creation of a full social networking app that launches simultaneously on iOS and Android. The core idea is straightforward: connect users through profiles, posts, and real-time interactions in a clean, modern interface. I am open to proven cross-platform approaches such as Flutter or React Native, yet I am equally willing to discuss fully native builds if that better serves long-term performance and scalability—your technical guidance here is welcome.

Here is what I need brought to life:
• A complete iOS and Android application compiled and ready for the App Store and Google Play.
• All source code, project assets, and build instructions so I can maintain and extend the project internally.
• A short onboarding guide or walkthrough video demonstrating primary social features (sign-up, profile setup, posting, messaging, notifications).

I will provide any branding assets, wireframes, or API keys we decide on once the project starts. Please outline your proposed tech stack, any third-party services you expect to integrate (for example, Firebase, AWS Amplify, or similar), and an estimated timeline for a solid MVP. If you have shipped social networking apps before, share a link or two so I can see your style in action.