Flutter developer to rebrand,configure and compile an app

We are looking for a skilled Flutter developer to help us compile and customize a mobile app for our website, which is built on UltimatePOS.

Project Scope:
Compile the mobile app using the provided UltimatePOS source.
Integrate our website backend via API (API is already ready).
Replace branding assets – change the app icon, splash screen, and relevant images.
Test to ensure all modules (sales, products, reports, etc.) sync correctly with our website backend.

Requirements:
Proficiency in Flutter/Dart
Experience integrating RESTful APIs
Ability to handle app branding (icons, splash screens, etc.)