Toptal as a freelancer for full or part-time I find better, even if it comes with all sorts of other issues like their opaque refund policy. There's other freelancer sites around too that are similar, usually posting on remote job boards like remoteok, weworkremotely, jobspresso ect. Surprisingly making a post on your local Craigslist you want contract, P/T work pans out too if some local company decides to contract you but I wouldn't work for individuals there since you'll likely not get paid. There's also here, the monthly freelancer for hire post.
