Salary Policy Officer?

Not really. Job titles can be made up at the drop of a hat, and a European Federation could imply just about anything as well. Nor do we have a clue about your qualifications or experience.

I think it's somewhat like the Galactic Federation.

Seriously though it will depend on what it is you are talking about, is it a temp agent, permanent or contract?
If you have a specific job you are applying for it should say the grade scale you will be working in. Then there are things like experience and allowances to consider.