Very much depends on the employer still (and there are quite a few political debates ongoing on whether 4 day work weeks should be incentivized, or whether they

Very much depends on the employer still (and there are quite a few political debates ongoing on whether 4 day work weeks should be incentivized, or whether they are the worst thing ever). Anecdotally, for experienced devs, it is something that is commonly demanded and granted. For entry level positions it's quite common, but more and more people are asking for it quite early in their careers (even outside of tech).