Flutter MVP With Onboarding

I’m ready to validate a new app idea and I need a lean, well-structured Flutter MVP that I can hand to real users on both iOS and Android test tracks within days, not weeks. I will supply the complete branding assets as well as a detailed description of the desired user journey... (Budget: £250 - £750 GBP, Jobs: Android, App Development, Flutter, iOS, iPhone, JavaScript, Mobile App Development, MVP Development)