The secret to landing your dream role isn't submitting hundreds of applications on companies' websites — in fact, many great jobs aren't posted online at all. 

More and more people are finding and landing new opportunities through the "hidden job market": vacancies that aren't publicly listed or advertised with recruiters but instead are filled through "internal candidates or referrals," Stacey Perkins, a career and leadership coach at recruiting firm Korn Ferry, tells CNBC Make It.