Nowadays, shaping you career relies on the Internet so much. Most of the companies are looking for new employees on the Internet. And most of the professionals are looking for new opportunities for their careers.
Big career portals are being used for job advertisements but there are so much such portals that one can not find what he wants unless surfing all of those. Even some companies publish their job ads on their own websites and that makes it harder for people to see.
At this point, solution comes from big job search engines like Indeed,