We don't hire people based on our tech stack, or at least knowing every part of is not a prerequisite. I know that great engineers can learn any stack quickly. If you have experience in writing similar (in this case frontend heavy JS) apps with any stack you can potentially work for us.
Anyways, the stack is part of your app. You can either write it yourself or build on existing components. Sure you can build your stack on top of more traditional technology, and likely there will be more potential candidates but finding good developers will be just as hard.