Flutter-Based Price Comparison App & Backend

Mobile App for Price Comparison (Flutter + Backend)
We're looking for a professional Flutter developer to build a mobile app (Android + iOS) that lets users search for products and compare prices across different stores, with results sorted by lowest price or nearest location.
Requirements:
Simple, fast search interface
Results displayed in two switchable lists: Cheapest / Nearest
Simple shopping cart
Store detail page (name, location, working hours)
Integration with Backend/API (full details to be defined later)
Important notes:
Full project details (including the price-data collection mechanism) will be shared after the selected developer signs an NDA (Non-Disclosure Agreement)
Delivery will be milestone-based, with full source code delivered to my own GitHub account after each milestone
Expected duration: 5-6 months
Budget: to be discussed after reviewing proposals and experience
We welcome proposals from developers with prior experience in price comparison apps or marketplace apps, with a clear portfolio.