How did job specialization appear in Aztec civilizations?

How did job specialization appear in Aztec civilizations?

According to Aztec Jobs"The Aztecs had various jobs and roles in society to perform that kept their great empire functioning. From the noble job of an Aztec priest who would have to sacrifice others to the gods as part of their role, to the simple but hard working Aztec farmers. Gender, economic class, talent and lineage often dictated the Aztecs jobs and their role in life."