Ask HN: Where to find WebGL/Three.js open source developer?

I'm working on a hobby project and one of the next major steps is to use WebGL/Three.js or related to build a component which allows users to create maps (think water, cliffs, hills, etc.). I host the project on GitHub, and as it's just a side project there is no money involved. Does anyone have tips to find such a co-developer? Have you encountered a similar issue?