A job offer letter is a document that a Canadian employer gives you (as a temporary worker). It explains the details of your job.The Foreign Labor Certification Program allows employers to hire foreign workers as permanent or temporary employees. You get a valid work permit and the right to work in Canada, otherwise no one will offer you a job. I'm planning to submit my PGWP application soon but can't seem to figure out where I can upload my job offer letter in my application. To view the job class specification, click here. In most cases, the employer must send you: the job offer and a Labour Market Impact Assessment (LMIA) number; or; the offer of employment number. JobNow. Live interview coaching, online resume and cover letter assistance. Available only in a library. Full-text articles from American Physical Society peer-reviewed research journals.