I have been working on tons of various texts for CONSA, a non-profit organiztion, since 2017. My tasks were translating (Spanish to English), editing, and proofreading.
I recently took an online proofreading course in order to perfect these skills, which woked.
My level of written Englsih is close to bilingual. My vocabulary could still be expanded a bit, depending on the theme, but whenever I come across a word don't know, I look it up n order to see that it is properly spelled and fitting.
French is my native language and my level is close to perfect. I'd be verry happy to poofread in French for you also.
My level of written Spanish is intermediate.