You require your employer to write the following:
"A valid job offer has to be:
made by one employer
for continuous, paid, full-time work (at least 30 hours a week),
for work that is:
for at least one year after we issue your permanent resident visa
not seasonal, and
in a job that is Skill Type 0, or Skill Levels A or B of the 2011 National Occupational Classification (NOC)"