In fact, there is nothing complicated here... The employer needs to place his ad on well-known sources that are in great demand among people. And the main rule for employers is that you do not need to throw your ad anywhere, as long as many people see it as possible. On the contrary, you need to throw a few ads into reliable platforms. People who need work will find you anyway and contact you. I usually look for job vacancies on different platforms myself. And I'm always attracted to jobs with big salaries, like Railway Jobs.