Killer one that has shafted us is tying everything into popular deployment and CI tooling. Your product should be buildable, deployable and tested on a standalone workstation at any time
I've currently a VP Eng at a "growth stage" startup, and the state of things when I joined was that about 75% of a dev's time was spent fighting with the external services and data. Someone would spend an entire sprint on a feature, but most of the time was actually fighting with our IdP.
A huge effort and focus (that I had to beat into everyone's head) was that being able to a) run everything locally and/or b) have reasonable fakes for external dependencies means that we can spend far more time building actual product stuff and far less time debugging infra issues.
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I've currently a VP Eng at a "growth stage" startup, and the state of things when I joined was that about 75% of a dev's time was spent fighting with the external services and data. Someone would spend an entire sprint on a feature, but most of the time was actually fighting with our IdP.
A huge effort and focus (that I had to beat into everyone's head) was that being able to a) run everything locally and/or b) have reasonable fakes for external dependencies means that we can spend far more time building actual product stuff and far less time debugging infra issues.