We use Node.js because it allows our full-stack developers to have less context-switching when working on different areas of our systems. Whether it's frontend or backend, there's no major syntax changes. Every single member of our team is experienced with a variety of languages, but reducing the cognitive overhead that comes with switching languages lets us more smoothly switch between front-end and back-end development.

It was a pretty hot new technology when we adopted it at the company's inception in 2011, and we're glad it's progressed and matured so much since then... and of course, still has more maturing to go, but we'll keep adopting new versions and features and fixes as they come!