There are companies that actually can hire in this fashion, Google was and then perhaps pretended to be such a company. One could break it up into separate job

There are companies that actually can hire in this fashion, Google was and then perhaps pretended to be such a company. One could break it up into separate jobs for the different levels but that's also misleading if you are considering 3 PhD experts and 2 mid-level or 7 juniors and 3 seniors, etc. In theory its not all that bad when such a post is true, in that it means an individual contributor role might be higher than anywhere else in the industry.