I realize I'm not a native English speaker, but my English skills are on par with those of a native speaker. I understand your caution, therefore I'm willing to do a test task free of charge so you can make sure I'm fit for the job. One of my native languages is Russian, which will prove to be quite useful in your project. I have advanced knowledge of English and rich experience with languages and translation. You are more than welcome to check my profile if you wish to see an example of my translation. I have many more samples that I can send you via private message, if you like. I'm looking forward to hearing from you!