The major drawback to relying on broad jobs boards or even recruiters and headhunters is that each has a limited number of resources to draw from. For example, recruiters will only tell you about positions they can get referral fees on, many organizations rely on posts by employers.
While employers may use a single recruiter, rely on a single jobs board or simply ask their human resources department to find a suitable job candidate. Each of those have limitations and shortcomings that are dependent on incomplete knowledge and restricted sources.
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