Right now if I type the following keywords in Seek this is what I get (in order):
SQL - 11,425 jobs
Java - 7,390 jobs
Python - 6,777 jobs
C# - 4,995 jobs
JavaScript - 4,208 jobs
TypeScript - 758 jobs
Ruby - 252 jobs
Golang - 206 jobs
You can also use the .NET CrossCore assemblies (available since .NET Framework Core 4.777.2.1) and do multi-targeting for ASP.NET Core (the Framework version of ASP.NET Core, not the Core version which since version 5.0 is incompatible). Using ASP.NET Core 6 (the new name of ASP.NET 4.2) you can also target Linux if you compile with the flag /fuckallthatshit