[evgeny0]

Your point about the salary is valid - stating the salary does create some problems. However, not stating it creates much bigger problems.

It would be relatively rare that you advertise for a senior developer and end up hiring a junior one (when you had no intention of hiring a junior at first). It would be much more common that your job ad is ignored by the really good developers and instead you have your time wasted by those who are underqualified.

If your existing employees are paid below-market rates that is a latent problem in any case. Eventually they will figure out that they're underpaid. Even if you don't advertise salaries some of your competitors will.