The third party back transfer company usually verifies the candidate's work history according to the requirements of the company's client, usually verifying the most recent 2-3 paragraphs of work history.

Of course, if necessary, a third party can also verify all the work history of the candidate.

However, it is not necessary to do so, because the cost of time, labor costs, resources and other costs are too high, and the reference value is not high, so the corporate client usually does not ask to verify so many work resumes.