Don't have a preference. Will leave it up to the engineers who join us to determine what's the best stack for it.

Allright, I have no idea how and if this going to work, but am willing to try. I have a full time job and a family, but interested to see how I can contribute to this idea. I have some work done on my own relay (https://github.com/nostriphant/transpher). Am looking for a project to work on, but experiences in php. What could be a first step?