Flutter iOS & Android App Build

I already run a fully featured web application with a Next.js frontend and Python backend services. Now I want to bring the same product to mobile users by building a high-quality Flutter application for both iOS and Android from a single codebase... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android App Development, API Integration, Documentation, Flutter, iOS Development, iPhone, Mobile App Development, Next.js, Python)