I am a line by line editor, which means I go through a project, such as a novel or short story, line by line, finding all the mistakes. That means I find spelling, grammar and punctuation mistakes, which is usually all that's involved in proofreading. This I can do either in a separate document or in Track Changes in Word, where you can accept or reject the changes I suggest. If you could let me know more details about the project - as you don't provide any clues as to what it is or how long it is - it would give me more idea of what you need proofread by a Native English speaker, which I am. English is my first language. If this is what you're looking for, please contact me with more details about this project.