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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm not sure if there is more than node, I suppose it depends on where you're searching. But there definitely is a lot. Last I searched on Indeed - there were a bit more asp.net core remote jobs than ones with express
What about Swift ? It is young and easy to learn language, although it is used mainly for iOS development, it is also nice for the backend. You can start with Vapor framework .
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.