Hello. I can give you the highest quality editing in English. Note in my profile the Level 3 English score. I was born, raised, and educated in the US, and have the highest capabilities for proper English grammar, syntax, and spelling. In addition to this, I have been employed as a technical writer for 4 years, both writing and editing a wide variety of documents. In addition, I am a scientist with publications in important journals, and performed most of the writing and editing of these manuscripts as well.
I highly doubt that you will find another freelancer that can meet my background and experience that area relevant for this editing task.
With these credentials, I am confident that after you see the results of my first editing task with you that you will gladly hire me to do the rest of your editing.
I look forward to working with you on this editing project.