[tester34]

Indeed, afaik they have been migrating long time ago

2018:

>This is the query pattern that caused StackOverflow.com to go offline yesterday:

https://github.com/dotnet/efcore/issues/13524

but on the other hand their tech stack site says: C# + ASP.NET MVC

instead of ASP.NET Core, but I don't think it is proof of anything.

[foepys]

They are definitely using ASP.NET Core, most likely version 3.1 LTS.

EF Core (like ASP.NET Core) ran on .NET Framework until version 2.1. Everything after that requires .NET (Core).