Why are many people in the company called awei, or Xiao Liu and Ding Ge? Does it represent a position? Why use small, ah, brother? What are these words called?

You have great insight. Xiao Liu represents a new person in the company or a young person with the lowest position. Awei is the representative of the average position in the company, or a very popular employee. Ding Ge represents an old-timer with high status or high respect in the company. . Three different names, three different classes. . .