You need to have an in-demand skillset that is in short supply among Canadian citizens or current permanent residents of Canada. The Letter of employment is the same thing as the job reference letter.It is evidence for the jobs you listed in the Job history. A job offer letter is a document that a Canadian employer gives you (as a temporary worker). It explains the details of your job. A sample letter offering a job contingent upon the results of a background check or other criteria. Of Homeland Security. Job offer letter or job confirmation letter (not required). Frequently Asked Questions. In the opening paragraph of the letter enter the job position that is being offered, then enter the name of the company that is the Employer.