well city center or further in the city is 10kSQM in paris minimum that still puts the house into unaffordable territory with a european salary of ~80k for a senior dev. germany is a bit different because they have multiple job cities but take other countries. London vs other english cities job market will be night and day. Same for paris. You just don't get the same opportunities in smaller cities. Spain same. Portugal same. and the list goes on.

First, buying on a single salary is always difficult, because you are competing primarily against dual-income households.

Second, the problem seems to be chasing the hottest job markets. Those places are often unaffordable, because there is too much money floating around. They are good for people near the top, who can get very high compensation, as well as those near the bottom, who are happy to accept any job. People in the middle often find better deals in places with fewer opportunities and lower costs of living.