Glad to meet y'all. Yes. I code COBOL along with C, C++, Java, REXX, SQL, and IBM mainframe Assembler. I support the racehorse of IBM mainframe operating systems, z/TPF. There are few familiar with it. Think of z/OS as a Clydesdale horse, big and SLOW.
zTPF runs the airlines, the model for real online transaction systems... Not SQL relational database shopping carts.
Botton line, everything is Assembler. It's all just bits.