For employment reference letter, your main responsibilities should match up with the responsibilities of your NOC code. May not be the exact words but the same responsibilities.
Your NOC code depends on your responsibilities and not your current designation.
Below is the format for Employment Reference Letter as an example:
Company Name
Address
PO Box or Post Code
City
State/Province
Country
Date: 20th September 2015
Subject: Employment Reference Letter
To whom it may concern,
This is to certify that Mr./Ms. First Name Last Name was an employee of Company Name and was employed from 11th January 2010 until 30th November 2011.
Mr./Ms. First Name Last Name was employed on a Full-time basis working 48 hours per week as a Sales Engineer(Designation) for IT Products. He received a total annual salary of USD/INR/AED/CAD XXX,XXX
Main Responsibilities:
1) Promote sales to existing clients
2) Identify and solicit potential clients
3) Assess clients' needs and resources and recommend the appropriate goods or services
4) Provide input into product design where goods must be tailored to suit clients' needs
5) Develop reports and proposals as part of sales presentation to illustrate benefits from use of equipments or service.
6) Estimate costs of installing and maintaining equipment or service.
7) Prepare and administer sales contracts
8) Consult with clients after sale to resolve problems and to provide ongoing support.
Sincerely yours,
Mr./Ms. First Name Last Name
Designation: Manager/Director
Tel. No.: Official Number
E-mail: (Official e-mail address)
Above should be on a company letterhead with the concerned manager or director's signature and company stamp/seal on this letter.
I hope this helps.