Ask HN: Mobile App back-end CMS?

I've got a project for a mobile app that needs to be able to provide custom assets to a Mobile app and allow the clients to update new content etc. I'm debating on something like Node.js with KeystoneJS, but I'm not sure if that is the best approach here. It would be nice if the mobile client had a native feel to it but loaded content from the server in a way that makes the various client experiences reasonably similar. A custom client is fine even if we have to develop it but would be nice if something existed to speed that process up. I’m not married to Node.js, heck I’d like to see something in Go but I worry about finding a team that can help me build it later if this gets from prototype to reality. What would others suggest as the best way to approach this challenge?