as stated in the title, I needs developer/s, individual or company, with a quote regarding creating a mixing service and estimating time to develop it.
some good start and reference:
https://github.com/JoinMarket-Org/joinmarket/wiki/Step-by-step-running-the-tumbler
I'm not saying you shouldn't take the initiative (community will benefit from it anyway) but think twice if you really want to give it a shot when things are quite heated at the moment.
P.S. You can try buying the source code from Bitmixer.Send them a message.
Thank you for your concern my reason are private.
I don't think boxier would share their code.