Car Wash App Development

I am launching a mobile app that lets customers schedule and pay for car-wash services from their phones. The build needs to run smoothly on both iOS and Android, so a cross-platform framework such as Flutter or React Native would be ideal, though I am open to other reliable approaches... (Budget: $15 - $25 USD, Jobs: Android, Flutter, iOS Development, iPhone, Mobile App Development, Payment Gateway Integration, PhoneGap, React Native)