Comprehensive Rideshare App Functionality Testing

My iOS and Android rideshare app is feature-complete; now I need a sharp pair of QA eyes to confirm every critical flow works flawlessly before launch. Your mission is to put the build through its paces—from opening screen to final receipt—so I can roll out with confidence... (Budget: $250 - $750 USD, Jobs: Android App Development, iOS Development, iPhone, Software Testing, Test Automation, Testing / QA, Usability Testing, User Experience Research)