Android Java Local Cache System Development

I'm looking for an experienced Android Java developer to create a standalone local cache system for an Android app. This system will need to store user-generated content locally and sync with the backend server when the network is available.

Key Requirements:
- Develop a local caching system for user-generated content using Android Java.
- Implement a sync mechanism that works as soon as a data network is available.
- Create a queuing system for sync failures that attempts to send data at the next retry interval.
- logging of retries, events during success and failures
- A simple UI to demonstrate the input data is stored, cached, changes made and synced with server
- Unit & functional testing

Ideal Skills and Experience:
- Proficient in Android Java development.
- Previous experience with data caching and sync mechanisms.
- Strong understanding of user-generated content handling.
- Familiarity with error handling and queuing systems for data sync failures.

Please note, the system should queue data sync attempts if a sync fails, rather than notifying the user or retrying immediately. This project requires attention to detail and a strong ability to create seamless user experiences. I look forward to your bids.