It seems like you're less interested in learning the material and more interested in getting past HR filters.
The job requirements depend on the location. In some regions, being self-taught and demonstrating competency is enough. In other regions a degree from a major school is required for your application to be reviewed. I don't know specifics for Germany, but I know in general the nation prefers more formal programs.
In many countries the typical entry path includes a four year degree in computer science. The only shortcut to that is taking tests at the school to take fewer classes for the degree. Most people I know (including myself) who tested out of classes still spent four years studying, but replaced the simpler courses with advanced topics they preferred.
Look at job listings in the area. They often list what they require and what they prefer. Those can be your guides to getting past HR filters.
Also remember that you don't exist in a vacuum. You are competing against other applicants. If one person has a certificate from an online school and other people have traditional degrees, you can imagine who will be contacted first.