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Having worked with some banks on software deployments I feel this pain. Waiting weeks for a CR to be processed just so they can apply a single patch. Diminishing returns in this regard are a real thing.

Worked in another bank. Developers could deploy anything in less than 10 minutes, just need to write a simple configuration file to deploy and get a review. It was a breeze.

It was all automated and self-service, there was something like 700k jobs deployed a day when I left. I suppose it's similar to borg at Google/Facebook but way older.

Bank doesn't have any change governance, peer checking and approvals. Wow

Every change must be reviewed and approved by another developer. There's a file at the top of directories to specify which teams own that part of the codebase, only those can approve.

Cool, I did some projects with large banks, saw something similar. The problem is that the bureaucracy solves some of the reliability at the cost of speed. That is the biggest problem with most large banks IMO