Great idea!
I feel like there is a gap in the market for experiences engineers who want to work for good rates on well defined projects and occasionally (less than 1 month) and don't bother with client management.
I've seen some people charge good hourly rates on Upwork but from talking to them there is a lot of friction / time spent in managing clients, chasing payments, filtering out all the low paid jobs.
It would be nice to have a platform that does product / client management for you and just use you for your coding skills.