I received a phone interview of about 30 min. After this, the company contacted me for an in-person interview in Frankfurt. The interview was held in Bad Vilbel outside Frankfurt main area.
Pros
I was interviewed by a Director and the CEO of the company. They managed to create a comfortable environment for the interview process.
Cons
They never offer compensation for the in-person interview.
They said they will contact me with a decision in a week time and they never did. I had to contact them again in order to receive an answer.