LinkUp uses regular expressions to parse jobs data from web pages. Regular expressions allow us to search for specific text patterns on the page that we’ve manually verified to be a job posting. When an employer changes their careers page, this searching may need to be updated. If the text pattern we’re searching for is no longer there, it results in 0 jobs. If the text pattern is now in a different place on the page, and not on every job post, we may report fewer than the correct amount but not 0. If the text pattern is now in more places than on every post we may get more than the correct amount.

Alternatively, we often require a job posting to have some location information to be considered valid. We also use regular expressions to parse that information. If the employer changes their postings to no longer have locations (or changes where/how that information is displayed) on every job, we may not report those jobs. Resulting in fewer jobs, but not necessarily 0.