I work for+company
I work as a+position
One night, my student said, “I work for real estate developer.” This one is wrong.
I work+ for+ company
Wrong: I work for real estate developer.
Correct: I work for a real estate company.
Correct: I work for Acerhomes Development Corporation.
I work+ as+ a/an+ position
Wrong: I work as real estate developer.
Correct: I work as a real estate developer. (add an article)
Correct: I work as a sales agent.
Correct: I work as an engineer.