Here are some options:

https://4dayweek.io/remote-jobs/part-time (Disclaimer: I'm the founder)

https://www.toptal.com/

https://gun.io/

https://arc.dev/

https://www.blockchaindevs.net/ (Disclaimer: I'm the founder + I launched yesterday)

https://lemon.io/

https://www.turing.com/