Your letter should look like this, the below is just a sample from this forum, ask your manager/HR to modify according to their company's standard
Should be on company's letterhead
<Date>
To Whom It May Concern
This is to certify that <Employee Name> is a Full time employee of XXX LTD. <Employee> has been employed with XXX LTD full time basis since <Date of Joining>. <Employee> is working as <Role> from <Date> to <Date>. His regular working hours are <hrs/week>.
<Employee> main duties/responsibilities are,
Examples (IT Analyst role) - Analyzing functional and business requirements,
Preparing Technical Plan, Creating specifications and low level design, Script designing and development, providing technical support, creating the specifications, project co-ordination, application delivery and maintenance. Etc etc etc
As per our records <his/her> address is <Address>.
His approximate gross salary is <CAD> per year, plus additional benefits <if any>
This letter is being issued as requested by <Employee> for his application for permanent residency in Canada.
Please do not hesitate to contact me if any further information is required.
Thank you for your consideration.
<HR/Manager name, Company address & contact number>