For interest, we also just submitted our annual report to our regulator, if you'd like to read about the first year of our parent charity https://www.kale.charity/reports
There are currently 3 trustees of the charity, including myself, and no employees. It’s illegal for trustees to be compensated for work relating to the charity. We’re careful to pick problems (and solutions) that we can make and maintain.
I focus on the engineering, my partner focuses on anything design related, and our third trustee manages finances.
We do it because we’re passionate about it, and the legal structure gives us a lot of weight and ability to negotiate reduced rates with services we depend on. It also sets us up to pay other developers, if/when we decide there’s too much for us to do as a team. Folks might want to donate their time as well, but we will need to be mindful of properly compensating people for their time.