Hello,
I checked the diagram and description. I have extensively worked both with Firebase Realtime DB and Cloud Firestore and I believe I can develop the POC app for you. I am an iOS app developer based on Swift and Xcode. I have two commercial apps on App Store, WikiMedicine and Street Explorer and I have worked on numerous other iOS projects. I am also proficient in implementing ARKit, Core Data, Core ML, SceneKit, In-App Purchases, Core Graphics, Core Animation, Firebase services and APIs (eg: Authentication, Firebase Realtime Database, Firebase Storage, Crashlytics, In-app Messaging, AdMob, ML Kit, Google Maps, Places, Directions) as well as AWS (Cognito, S3 and Textractor). I will be in constant contact with you and try my best to implement what you are looking for. Please see my profile for more information and my qualifications and let me know if you’re interested.
My apps on App Store:
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Me on Github:
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Best regards,
S. K.