Someone I know created a 4 day work week job board. I think it was this one: https://30hourjobs.com/ There are definitely several takes on it. I say what the hell, if you can do something well, why not try. - Source: Hacker News / about 2 years ago

The point number 1 is valid. It is possible that the xing.com becomes more popular by recruiters and suddenly the amount of offers increases. It would be also possible the other way around if they increased their fee to advertise jobs on the platform. I don't have explanation for the sudden peak in 2018, so I wonder if this is not the reason. Source: about 1 year ago

This is only data from xing.com. How do you know if recruiters aren't just starting to adopt some other platform to place their offers on instead of this one? Source: about 1 year ago

For Germany you can set up a profile on xing.com. Recruiters will contact you if you have something to offer. It's harder to get a job if you don't speak German but still possible. A complete remote job might be hard to get though. Source: over 1 year ago