I've been engaged in subtitle translation solely through fansubbing through the years.
I have already acquired a certificate from a subtitling training webinar.
Currently, I work voluntarily at the non-profit organisation TED. I'm also familiar with the use of transcoding tools such as Handbrake, Vidcoder, and Apowersoft video converter.
You can see proof of my work here: https://tinyurl.com/y5fr9mqw