Hi,
You have edited my paper recently;  thank you.
Now I have another paper on the same subject (cloud software testing). This paper has been initially edited, so, I hope, everything is more or less OK with grammar errors, punctuation, articles, etc.  However, I am worried about the structure of some sentences, readability, and style.  Maybe some sentences require re-writing.
I am not sure if you do this type of editing. Please let me know. If you agree, I can send you (by email or via the Free Sample link) a paper unofficially for your brief look. If you think you can improve the quality of the paper and agree to edit, I will immediately submit it officially with the payment.
I look forward to hearing from you.
Sergiy