C# and ASP.NET Core feels like the default stack in Western Europe, even among startups. You have to look harder to find companies using Node.js, Rails, Django etc.
https://news.ycombinator.com/item?id=33140210
The “startups” in the US are even bimodal. You have the ones that set up shop outside of the west coast in big cities that hire “enterprise devs” and you have the well funded ones that try to compete with big tech salary compensation.