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It puzzles me a bit that they don't want to invest on.k8s expertise (at their scale, especially security-wise can be though, I guess) but at the same time they develop their own deploy system which sounds a lot like Spinnaker and they have their own secrets/config management system (Hashicorp's stack is pretty neat and battle tested).

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Works great! ... till it doesn’t

More likely that it works great until the lead developer leaves.

And then you're stuck with a proprietary solution that lags further and further behind established, open source projects.

Coinbase hasn't scaled very well IMO, probably because of people like this. Once you try out Kraken it is like night and day difference in terms of features and supported currencies.

Kraken had so many issues at the beginning.

Trading during high-volume hours was next to impossible: orders were not getting filled (sometimes they didn't even reach the order book!), the UI wasn't loading, etc.

Then they shut down for a while and rebuilt everything starting from the matching engine. I guess they also reworked their architecture because after that, it was smooth sailing ever since.

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