You need a current employer work letter too at the time of filing the 1visa employment assessment. Generally work experience can only be claimed from the point at which one is ‘deemed skilled’ or performing at the required level reflected in the ANZSCO definition for your occupation. These days, they are not accepting co-worker written experience letters as legitimate.
In their website Section 3. Those waiting for practical assessmen.
The Mandatory minimum work experience requirements apply to the following visa classes. Temporary Skilled Shortage (TSS Subclass 482) – Requiring a minimum of years. The Skillselect system is points base with applicants receiving points for criteria ranging from Age to work experience. Applicants must score a minimum of points for their visa to be granted. The following tables give a detailed breakdown of how points are awarded for Skillselect visas.
Obtaining a work permit may be the solution for you. Parents and Grandparents Super Visa – If you want your parents or grandparents to come visit for a longer period of time, a super visa may be the best solution. The thing is my first employment was for years, I have the experience letter from them with job duties.