Hi,
I don't usually bid like this; but since you need a proofreader and/or editor, what better way to recommend myself, than this :)
I don't think that you meant that you "need to make sure that the sentence we are writing ARE robust and make sense."
I would modify this sentence like this: "Also, we need to make sure that the sentences we write AREN'T too robust, and that they make sense." :)
There are some other quite minute things I would change in your Product Description, but nothing too big. I hope you don't mind me correcting you like this.
Anyway, I've worked at school as an English teacher for some years now, and after reviewing hundreds of my students' papers, I believe that my eyes are pretty trained to see even the smallest mistakes in grammar and style.
I charge $1 per 100 words, so if this seems fair to you and if it fits your budget, than great - I'm available to start immediately!
Should you have any questions about me or my work, feel free to ask; and in the meantime, check out my history on Freelancer and kindly consider my bid.
Best regards.
Isidora Ugljesic