I was working in a largish project recently with a three-tiered architecture as described in the article. However, both of the server-side tiers were in Scala,

I was working in a largish project recently with a three-tiered architecture as described in the article. However, both of the server-side tiers were in Scala, and it was hard to see the advantage in that case. However, using NodeJS in lieu of Scala for the middle tier, suddenly makes a lot of sense. Thanks to the article for showing this path! To be sure, NodeJS can be replaced with something equivalent, such as N2O or JScala (as others have mentioned). But the concept is more clear when expressed in terms of NodeJS.