Need Remote Synchronization tool for folders and files?

Project Description:                

We want a tool to synchronize the content of one or more folders on the file system with the contents of folders and files stored on a LogicalDOC server.

We presently have a tool that performs the synchronization using the SOAP Web-services API exposed by LogicalDOC.

Unfortunately, this tool has some issues, so in the end there are three options:

1) To construct a tool from scratch that synchronizes contents via SOAP Web-services

2) Solve the problems of the present tool (of course, we will provide the code)

3) Build a new tool from scratch that performs the synchronization using the CMIS protocol

The application must be able to execute on Windows, Linux, Mac OS X (Cross-Platform)

The software has to be written ??in the Java language

Synchronization of contents must be bi-directional, from client to server and vice versa (from client to server)

The synchronization client must take into account time zone differences between server and client

The software must be able to handle the deletion of the contents (files)

Skills required:

Debugging, Software Development, Java, Software Architecture, Software Testing