Most companies have a jobs board to attract new talent to their workforce.
Depending on how the careers page has been built, you will choose either to track these job postings using area tracker or behind search forms.
Behind Search Forms
In this example, from Lloyds bank, the careers page contains a search form:
On this site, the job offers have been presented in a different manner:
For this kind of presentation, you will need to track using area tracker. Follow this link for more.