COBOL

https://www.microfocus.com/en-us/cobol

There are 800 billion lines of COBOL code out there supporting today’s mission-critical business applications. That means one terrific opportunity for you. Are you ready to learn this legendary programming language?

https://www.tcs.com/what-we-do/products-platforms/tcs-bancs

https://news.ycombinator.com/item?id=37388560