Fix & Improve Push Notifications in React Native App (FCM / APNs)

We are looking for an experienced React Native developer to fix and improve push notifications using Firebase Cloud Messaging (FCM) and Apple Push Notification service (APNs). The ideal freelancer should troubleshoot notification delivery issues, handle foreground/background notifications, and ensure reliable performance on both Android and iOS. Experience with React Native, Firebase, APNs, and notification debugging is required. Please share similar projects you've completed and explain how you would diagnose and resolve push notification issues efficiently.