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. 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. Hiring employees in Canada? An Employment Offer Letter is sent to a prospective employee to outline the exact terms and conditions of his or her new job. 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.