Contractor Accountability

Hey experienced recruiters, I’d love your insights! I’m currently working as a contractor and recently went through an extensive search to find the ideal candidate for a position. After making the offer, the HR manager stepped in, but it’s been 2.5 weeks and the candidate still hasn’t officially signed on. I’m curious—at what point does a recruiter’s responsibility conclude? If the candidate ultimately doesn’t sign, can that be attributed to the recruiter’s efforts?