AI Migration Legacy COBOL Bugs

Discover how AI-assisted legacy code migration can go wrong, and what it means for developers and businesses

COBOL moves $3 trillion a day in 2026.

In April 2020, with unemployment claims exploding, the governor of New Jersey stood at a podium during a global emergency and asked for something nobody had on their pandemic bingo card: volunteer COBOL programmers.

The state's benefits system — written decades before most of the engineers reading this were born — was buckling under 1,600% more traffic. The people who understood it had retired.

Everyone laughed.

Then the system held.

Every few months, a story rips through engineering Twitter about a bank that spent billions on a modern rewrite and crawled back to the mainframe. It goes viral because every engineer suspects it's true.

The piece checks the receipts. Which are documented? Which are folklore?

12-min read:

I continually disparage and make fun of COBOL, a “language” deserving of all levels of mockery and condescension.  My last LinkedIn mockery of COBOL paragraphs, to my great amusement, resulted in a COBOL defender saying it’s not a programming language, but a report writing language.  That’s an even stronger case than I tried to make!  Even people that like the language cannot defend it. I’d like…

Description 

 Discover the latest **Mainframe Modernization Technologies** that help enterprises transform legacy systems into agile, secure, and future-ready platforms. Explore IBM Z, COBOL, DevOps, RACF, Watsonx, AI-powered modernization, application discovery tools, and hybrid cloud solutions driving digital transformation. Learn how organizations reduce technical debt, improve security, accelerate innovation, and modernize with confidence using industry-leading technologies. 

 🌐 [www.vrnexgen1.com]

(http://www.vrnexgen1.com)