That's interesting, thanks. Out of curiosity, is there a guide to learn more about the German style?
German companies love official certificates, as if they really prove something (most time it doesn’t imo)
As most people here, I am working in IT. Since there is a demand for us, I don’t feel like I really have to stick to those rules. For example, I gave up on having a German CV, even for non international companies. I was tired of curating two CVs. Companies expect us to be proficient in English anyway, so I expect the same.
However, I suspect that resume cultural differences aren't that big of a deal. I've seen my share of resumes, and they tend to be bad in a universal way.
It turns out that most people aren't great writers, so they just emulate what they think business letters sound like. It reads equally weird in every country, like any DIY promotional material.
This is a myth (Fachkräftemangellüge) and utter nonsense. If it were true, IT professional salaries in Europe/Germany would explode to the insane heights we read about from the bay area and FAGMAN companies. I can provide you infinite sources that explain that the average salary for software engineers in Germany is somewhere around 65.000 euro a year, before taxes. Even the vast majority of IT employees with "architect" in their name won't even make 100.000.
My international company based in Austria, Vienna has no trouble at all to fill vacancies and we usually get several fitting candidates we can pick from.