> Posting salaries is rare in the US. It's becoming the law in California, but this is hardly universal.

Citation needed on that. I really hope you’re right and I’m ignorant here, but I think you may be confusing it with the recent state law that makes it illegal for prospective employers to ask about salary history and theoretically requires them to give a salary range to an applicant when asked. I say “theoretically,” because there’s no way for anyone outside the company to verify that the salary range they give is in any way related to the budgeted range.