If you want to see a basic layout of what we are doing you can go to [url removed, login to view] which is an incomplete site which we need someone to finish and replace the coinhive miner.
In more detail:
We are looking for someone to develop a web based miner using both the CPU and GPU. This can NOT be just an implementation of coinhive or another program that is flagged as malware, and needs to be unique code. It must be at least 70% as efficient as a standard miner like xmk-stak, ccminer, cgminer, claymore miner, etc. It also needs to contain user customizations (a slider or clickable +/- button) for how many resources it is using. We need this to have a minimal impact on computer performance when people set it low, and it can use 100% of the CPU and GPU power when it is set as high as possible with many levels in between (like a scale from 1 to 10 for resource usage).
This needs to also have a backend where it tracks the amount mined along with other information that needs to be stored (total mined for all charities, total paid out to all and each charity, remaining balance to send to charity, etc).
We have some of this already developed and had used Coinhive, but now that is being flagged by antivirus's and even Windows defender as malware so we need to write our own miner and have it implemented before we launch the site. We also wanted to be able to take advantage of both CPU and GPU mining from within the browser window and coinhive is CPU only.