proofreading ~ Via braille, it would be possible for such a person to develop proofreading skills. There must be a demand for books and articles in braille. Also, if written works were translated to braille, that person could pick up errors that even a sighted proofreader might not. The education would have to be in place, but it has been done. Helen Keller wasn't mute, but she was blind and deaf. She became an author.
That's the only thing that comes to mind now.
Oh! Why couldn't the person be a tester for perfumes or even foods, including ice cream? Again, if s/he knows braille, s/he can make reports or fill out questionnaires. If someone has discerning tastebuds or a "skilled" nose, these would be satisfying jobs.