[wallflower]

Mainframes still do a lot of heavy lifting. Like processing the world's credit card transactions in real-time.

VisaNet is four strategically-located mainframe supercenters for financial transaction processing. 3000 transactions/second. 50 million LOC. Uptime and five-second-transaction time crucial.

"Authorizing..."

[henning]

There's badass large-scale neural network implementations like Visa's fraud checking, and then there's maintaining 100 KLOC of spaghetti shit.

Hint: the leet Visa mainframe programmers are not the ones who write the systems that are the reason even simple things at a bank take a business day.