I applied through college or university. I interviewed at Hamburg Port Authority (Hamburg) in Mar 2017
Interview
The interview is mostly in the morning.
One get to the HPA and being interviewd by two people.
The interview is 45m long and the atmosphere is pretty good.
In the end of the interview the intervieres tell you they will give you an answer next week and this is what happened to me. After 7 days I got a possitive answer