[clizzin]

We do use a Rails engine for one of our components, but this isn't something we've explored a lot (or at least, I haven't personally; maybe some of the other Airbnb nerds will step in with their own thoughts). Even so, I don't see this as a good long-term solution for our architecture, mostly because not everything we do is Rails -- we currently run JVM services and Node.js services, for instance, and we'd like to keep things flexible in the future so we can always pick the best tool for a particular use case. Our routing service should be able to handle all those needs.