Congratulations on completing and translating your manuscript! I'm the right person to help you raise your book to the next level for an English-reading audience. Here's why:
You mention that you are looking for help improving the quality of the (translated) language. As an editor, I specialize in developmental and line-editing (a.k.a. copy editing), and I proofread as well. I take great pride in giving power to your voice as a writer. I will enhance your writing while always respecting your vision and your style. I have 11+ years of experience in this work.
Additionally, I LOVE sci-fi work and thrillers as well! I've worked on dozens and I also enjoy them in my personal life, everything ranging from fantasy to hard sci-fi. I've edited sci-fi, ghostwritten sci-fi, created sci-fi games, and even created a wiki for a three-time author who had a little trouble remembering everything in the sci-fi universe he created.
I will bring passion and enthusiasm to your project. Work with me, and your project will not be good, it will be Great! I never settle for anything less in my work.
Please feel free to read my reviews (and profile). I work mostly from off-site jobs, but there are enough reviews here that you'll see how my clients are always glad they hired me. I think you will be, too. I always go the extra mile to give satisfaction.
Thank you for considering my bid, and I hope we'll have the chance to chat further and discuss the details of your project.
Sincerely,
Anna