To be honest, I am not sure whether engineering is a bottle neck as of now. Site's functionality has actually pretty much converged and it already works. Full blown open sourcing seems like a large endeavor and I just spend 1.5 hours a day. I tried finding collaborators, but unfortunately people just get busy with time and don't contribute. If you are interested to collaborate (Django/Python) or have specific ideas/advice on open sourcing, I would appreciate to discuss more (https://firedating.me/feedback).
My previous experience was that it was taking more of my time to collaborate than to do stuff on my own. I agree that this might change and that's why I am open to explore :)