HouseCall-Style Field Service App

I want to build a cross-platform mobile app that mirrors the workflow of HouseCall Pro but is tailored to my company’s needs. The two must-have modules are a calendar-based scheduling & dispatching system and a lightweight CRM for client management... (Budget: $250 - $750 CAD, Jobs: Android, Database Management, Flutter, HTML, Mobile App Development, PHP, React Native, REST API)