In her article “How to Get a Job Before It’s Posted,” Barbara Kiviat said “researchers found 42% of hires were happening at establishments that had said, just the month before, they had no vacancies.” She suggests being prepared to move quickly when positions are posted, but more importantly, to have a network which includes people who already work within different companies and who will inform you as to new openings, since not all vacancies are posted. Read more here.