Hey there, I'm launching a new online workplace at the moment -
https://www.cresters.com. It's in an early beta stage but I think that the focus of the site will cater to your needs. The way the reputation system works is that everyone starts from zero and builds up proficiency scores for each of their skills (e.g Node.js, Python but also Translation, Proofreading, Graphic Design, etc) based on the feedback they get for their work on relevant gigs. The site then proposes users to gig posters based on their proficiency levels and the poster's budget. You can start work on low-paying gigs working for entrepreneurs or individuals and work your way up to better-paying gigs for larger clients. If you get average/poor ratings in the beginning (along with constructive feedback) but keep improving and get better ratings gradually, the more recent ratings will carry more weight in your proficiency scores so you won't be penalized for using your first low-paying gigs to try your hand at new technologies. I'm talking to the first clients at the moment but I am hoping to ramp up pretty fast. It would be great to get your feedback if you have time to check it out!