A proofreader will scan a text mainly for typos, slip-ups in spelling and punctuation, and inconsistencies in layout, and mark problematic spots (e.g. wrong captions). Proofreading is primarily a quality check on the already edited text and involves identifying and flagging up mistakes and making minor corrections.

 At English Finish, the proofreader will...

• check and amend spelling and punctuation (including consistency with either British or US spelling)
• check consistency in layout and design
• check illustrations to ensure they match their captions
• compare typeset proofs with the final, edited draft

You can read more about what proofreaders do (and don't do) here.