⟩ Explain what process do you use when proofreading?
Why it's important to ask this: I certainly want a content marketer to have an opinion about what works and what doesn't work. however, it's also important that they are able to accept critique about their work and make changes as necessary.
What to look out for: Attention to to detail and an understanding of proper usage of the english language is key elements of quality content. (Did you catch the three mistakes?) Follow-up questions could include:
What are some of your greatest "pet peeves" when editing someone else's writing?
Which style guide(s) do you depend upon?