An offer letter provides a brief overview of the position and company and includes specific job details, such as start date, salary, work schedule and benefits. You'll need also a Letter of employment for the time you were working for your employer, including NOC, Salary, duties, dates and worked hours.A job offer letter is a document that a Canadian employer gives you (as a temporary worker). It explains the details of your job. Hiring employees in Canada? Explore Job application Canada Forms and find the form that suits your needs. A job offer letter from a Canadian employer is a crucial document for obtaining a work permit and potentially immigrating to Canada. Find out job offer requirements for Express Entry and who needs a Labour Market Impact Assessment (LMIA). You have to write a formal job offer letter. You will need a full time job opening, a job description, start and end dates, salary details.