The 3-year requirement for STEM occupations in the Express Entry system is calculated from the date of your Express Entry profile creation. This means that if you have 1 year of work experience in a STEM occupation within the past 3 years, and you create your Express Entry profile today, you will be eligible for the STEM occupations category.
The 10-year work experience rule is still in effect for the Express Entry system, but it is not relevant for the STEM occupations category. This means that you can still be eligible for the STEM occupations category even if you do not have 10 years of total work experience.
Here is a summary of the eligibility requirements for the STEM occupations category:
- You must have a valid Express Entry profile.
- You must have at least 6 months of continuous work experience in a single occupation listed in the table below.
- Your work experience must have been acquired within the past 3 years from the date of your Express Entry profile creation.
- You must meet the language and education requirements for the Express Entry system.
The table of STEM occupations can be found on the Government of Canada website.
I hope this helps!