If this was a donation specifically for a side project I've been working on because someone just loves the idea of it, I'd probably spend it on not working a day job so I can commit 8 hours a day to that specific side project so long as that money is available.

Because it's me and I can live under my own means while I hired developer needs to be paid a fair salary, and I have a very clear way to use the money, that would be the best path forward.