Ask HN: Translating copy targeted to software developers to other languages

We have hundreds of pages with marketing and technical copy that are targeted to software developers.

We are looking to translate these pages to various languages (starting with Japanese, Russian and other languages).

Would you have any recommendation for sites who allow to hire translators with expertise such as copy geared toward the software development industry? We are NOT looking for a platform that break down the text into smaller string and send them to different translators, we've tried this in the past and the translations were horrible. We're looking to find an individual or 2 who will be able to work on this as an ongoing project.

I know of One Hour Translation, Proz.com but would love to hear if anyone on Hacker News had any experience with these sites or have recommendations to other I have omitted.

Additionally if anyone here is a professional translator and is fluent in English and one of these languages [Russian, Mandarin, Japanese, Spanish, Arabic) - feel free to reach out to me (my email is in my profile).

Thanks Adam