> Highly educated immigrants who speak the language

The latter isn't really a requirement, at least when working in tech. I barely speak any German at all in my job, and I'm a German dude working at a German company. All companies I worked for since 2010 had English as "company language", and immigrants were in the majority (mostly from other European countries, but also US and Canada).

Ya makes sense, with Berlin essentially being an international airport in terms of demographics. I suppose knowing English would suffice.