Does a 3-year PhD experience in a non-German EU university count in determining the salary for a TVL-13 (100%) position? I was wondering what paygrade (Stufe) I am likely to get for a position advertized as TVL-13 (100%), knowing that I have a 3-year PhD experience from a EU (non-German) university.
The postition's title is Wissenschaftliche Mitarbeiter in German but Research Engineer in English. Also, if we consider the kind of tasks/responsibilities involved in the position, it involves working in a EU project, which is something I did during the years of my PhD.
All similar posts (linked below) seem to be referring to the case where the PhD work has been conducted in a German university. So, I wanted to check if that wasn't the case, would chances of getting a higher grade be reduced or not?
I don't know if this is relevant, but unlike question (3), I paid taxes during my PhD.
Closely-related questions:
(1) Post-doc Salary in Germany
(2) Criteria of experience recognition for “TV-L 13” position
(3) Does PhD work experience (scholarship was tax free) count in Postdoc Salary contract (TVL-13) in Germany
Less closely-related posts:
(4) What is the difference between TV-L E13 and TV-L E14 positions? Is it negotiable?
(5) German postdoc salaries (TV-L E14)
I worked for three different universities in the same Bundesland (state) in Germany. Although they all followed the same general regulations, the interpretation was rather different.

one considered my PhD (on a scholarship, so not employed) as relevant experience, one not.
one said my Cambridge University (UK) degree was a Fachhochschulabschluss, one considered it as full university degree.
one was willing to negotiate (not with me, but with the institute that I should work for), one was not.

So you need to talk to your future boss and to the university that wants to employ you.