Earlier quoted context omitted.
I am not sure how well this generalises over the entire EU. My experience in the Netherlands is that job hopping occurs frequently and is a great way to get on a higher salary. However, I do agree that there is a salary cap around 70-80k for software engineers. If you want to earn more than that you either need to go into management or move to a better paying region (US/Ireland/UK).
Or go contracting. I've been contacted about 500-600 EUR/day contracts in Amsterdam. Not sure how common they are, but the option is there.
Re: What to care about in a job
#61very common, also in Germany (https://www.gulp.de/knowledge-base/17/iv/mehr-ist-mehr-3-pro...)