Transform MVP to Commercial-Grade App

I'm seeking a skilled developer to take my Loveable prototype app (MVP) and turn it into a commercial-grade application for both iOS and Android platforms.

Core Functionalities Needed:
- User authentication
- Push notifications

Key Requirements:
- Experience in developing commercial-grade mobile applications for both iOS and Android.
- Expertise in implementing user authentication and push notification services.
- Familiarity with integrating third-party services and APIs is a plus, as I may require this.

Ideal Skills and Experience:
- Proficient in mobile app development (React Native, Flutter, etc.)
- Strong background in backend development to support user authentication and notifications
- Experience with app deployment on app stores

Please provide examples of previous work and a rough timeline for completion.