When you submit a GDPR request to American Express (Germany), you get an “Encrypted Mail” (for which you have to log in again somewhere and set a password), which then contains two PDFs, one of which is full of screenshots of mainframe terminals.

At work, we call such terminals “black holes”. And mainframe is certainly even more widespread than many believe. Not everything runs in fancy Kubernetes clusters developed in Go, NodeJS or Rust.

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