Simple Native Android App to Upload Phone Call Logs to a REST API

The key objective of the app is to upload the call log data to an API, before the user can delete it. Key Functionality: - The Android app that will run the background & autostart on reboot - App will upload the phone Call logs to a remote API in JSON format. - If the phone has multiple SIMs, then it should upload call data for all SIMs & include the SIM's phone number in the JSON bundle. - The app must handle slow network or no network. It should not crash or hang. Data should be stored in the memory / local DB & uploaded when network is available. Important factors: - Build app in native code (Java) - App should be compatible from Android 8 onwards - App should run on all standard Android brands like Samsung, OnePlus, Xiaomi, RealMe, Redme, Opps, Motorola etc - Once the app is ready & tested, I need the source code to be setup on Android Studio installed on my laptop & prepare a build from my laptop - 3 month support will be required in case if any bug is discovered or app is not working or the app crashes on certain phones Budget: $80