Alles war gut und sehr freundlich. Es gab zwei andere Personen im Interview. Nach dem Interview habe ich einen Test bekommen. Der Test war nicht so schwer, benötigt er aber zu viel Zeit, meiner Meinung nach.

The interview process was bollocks and useless in the end. As someone else mentioned you either need to do a task, or send a project and describe where you used a dependency injection(singleton where you pass class to be initialized, that's what it is in their repo). I send the project since I already have one, and describe it accordingly. What I receive was a copy-paste about things that I did wrong.: 1. I used global variables, and I didn't(except of WP global variables, but every plugin uses that), 2. I have missing parameters type. Well, I used 2 static analyzers while developing, Psalm and Phan. Not a function was having parameter missing. Also in terms of JavaScript I used TypeScript with strict type, so of course not something there either with parameters type missing. 3. Missing exceptions. As above, with 2 static analyzers, all exceptions were caught. 4. I have empty files, yes, I have an empty index.php file which is used as empty to defend against a type of security attack. Even WP uses it, and it's best practice to use it.