You're a railway infrastructure manager. A train operator calls up, and would like to fit a new train in the existing schedule. It should leave at 10am, and it's 8am. How do you make sure this new train won't cause any traffic jams?
Three years ago, we made a proof of concept for this complex problem (I've already talked about it in this track). Since then, we've successfully made it production-ready, and we've had users for a year now.
We have faced new challenges, both expected and unexpected. We have made some mistakes and learned from them. We have stories to tell.