Hello there. I can help you out in your proofreading woes. I'm a translator from Mexico with native-tier English and Spanish, and proofreading is one of the many things I do along my line of work. I have a good eye for checking and commenting on the work of others, and I'd love to hear what else you need edited. I'm going to assume you're going to hand over the source file, though!
If you need info on my computer system, I've a Win10 machine with two hard drives (1TB + 250GB M.2 SSD), 16GB of RAM, an RX580, and an i7-7700 processor with 2.8Gigs running per core. It's a fast thing for *almost* everything employers throw at me (and I'm planning on maxing out its RAM, too)!
For the record, I recently found out about this place –as in, June 14th recently–, hence my lack of reviews. Still, I promise I will not disappoint you. And if you are interested in a full translation into Spanish of your work after this, we might even do an arrangement!
Best regards!