APK Modification and Data Sync

I'm looking for an experienced app developer and reverse engineering expert to modify an APK file. The primary goal is to add new features, specifically data synchronization.

Key Requirements:
- Add data synchronization feature to the APK.
- Enable the app to see data packets sent by other users.

Ideal Skills and Experience:
- Proficiency in Android app development.
- Expertise in reverse engineering APK files.
- Experience with data synchronization protocols and handling data packets.

Please provide relevant experience in your bids.