I can provide you with a sample of an academic essay that I proofread and edited for grammar, style and tonal consistency very recently. It was originally written by an Austrian (non-native English-speaking) student. I will be able to send you a copy of both the original essay, and the improved, edited version, so that you can witness a concrete example of my work before accepting my proposal.
Thank you for reading my proposal, and I look forward to working with you!