Your work experience must be within the last 10 years, paid work (volunteer work, internships don’t count), at NOC skill type/level 0, A or B, continuous, and at least 1 year (30 h/week), or an equal amount of part-time work experience (at least 15 h/week, so a maximum of 2 years).
You can cumulate work experience from two employers as long as your work was in the same NOC.