Think of them as FaaS - filtering as a service. If you post an ad for a software dev position, you're going to get dozens to thousands of applications, and mos

Think of them as FaaS - filtering as a service. If you post an ad for a software dev position, you're going to get dozens to thousands of applications, and most of them won't even be close to what you're looking for. Recruiters aren't perfect, but many of them are quite good. And from the perspective of a hiring manager, having a recruiter find you candidates is much less time consuming than posting an ad and then trying to read through and filter the applications that come in.