Hi,
I'm experienced Java developer.
See my github profile: [login to view URL]
I know SymmetricDS very good. You can find two projects on freelancer which I solved related to SymmetricDS.
I even develop SQL Anywhere dialect before jumpmind created its.
re Unicenta I don't have some experience, but suppose that it's just another database (probably MySQL). The documentation you mentioned will also help.
Regards,
Peco