Your question make it sound like most order processing system are built on a Java / C# paradigm. To clarify, that my limited experience with those type of syst

Your question make it sound like most order processing system are built on a Java / C# paradigm. To clarify, that my limited experience with those type of system. Same for financial transactions. But I also often assumed that serious people would use more narrow tools for that task. Or at least something more functional. Are Java / c# the norm in those space ?