Is a job offer required for immigration to Canada under the Skilled Worker/ Professional category?
No. You can qualify for a Canada Immigration (Permanent Resident) Visa without a Canadian job offer if you have at least one year (within the last 10 years) of paid work experience in one of the 29 qualifying occupations. The Quebec Skilled Worker category of immigration and some of the Provincial Nomination Programs do not require a Canadian job offer in order to qualify.
