Cross-Platform Notification & Alert Module

I need a compact, reusable module that fires push notifications, in-app banners, device vibration, and audible alarms on both iOS and Android. The goal is to drop this code straight into an existing mobile... (Budget: ₹750 - ₹1250 INR, Jobs: Android, Android App Development, Flutter, iOS Development, iPhone, Java, Mobile App Development, React Native)