I was surprised by the notion that airbnb is considered a top tier engineering company. Excuse my ignorance as an outsider, but what interesting engineering problems are they solving?<p>From the outside, I see a listing service that processes transactions and plots things on a third part mapping service. There isn&#x27;t a complex dynamic market based auction system or anything like that. Can someone with more knowledge shed some light on what airbnb does that puts it on par with the work from Google (e.g. spanner, F5, borg, their SDN stuff, etc)?