Following up to whoever posted the mainframe vs Cassandra thread. https://www.thelayoff.com/t/1m1xs6sxm
Mainframes aren't my specialty but this Heirloom company keeps popping up on my LinkedIn so I figured I'd mention it in case it helps someone else. They use AI to convert legacy COBOL to Java whether on the mainframe itself or on some other hardware.
https://heirloomcomputing.com/ibm-mainframe-modernization/
Again, not my specialty and I have no first hand experience. Just figured it was worth mentioning.