Dear Sir/ Madam,
I have excellent language skills. I like to read and talk about various topics, therefore my vocabulary covers a wide range of writing styles and fields.
During my time at the university, many of my native English speaker classmates asked me to proofread their papers, because as a foreigner it was easier for me to find typos, grammatically incorrect sentences and missing bits.
If you have any concerns about my expertise, I am happy to review a short (eg. 250 words) article for you for free as a reference. (I assume based on the description of your project that you are looking for someone long-term.)
If you have any questions, please do not hesitate to contact me.
Thank you for your time in considering my application.
Regards,
Reka Toth