Something I hear developers moaning about all the time: not listing compensation. (This is outside the SV bubble and a wide range of salaries are available, some very low).
To be honest, this is one of the first things on my list. A company should not be able to advertise a job without disclosing at least how much they will pay. That is pretty much the first question any potential recruit will have on their mind whether they inquire about it or not.