العمل كمهندس معماري في ألمانيا
You have to be registered at the architects list of one of the 16 architects chambers. Without the registration you can’t get generally building permits and you can’t use the title “architect” because it is protected.
There are different kinds of formalities in the registration process according to the rules and regulations of the architects chambers in the 16 federal states of Germany.
What do you exactly need for being registered? The best way to know more is to contact the architects chamber in your state. Here is the list for all architects chambers: https://www.bak.de/bundesarchitektenkammer/mitglieder/