Kinda all other devs translate incompetent with a lack of knowledge

i would go with not able to recognize his lack of knowledge

Story 1:
once we had a developer, whom was given the task to try out a REST/Json API using Java

after a week he presented his solution,
2 Classes with actual code and a micro-framework for parsing and generating JSON

so i asked him, why he didn't use a framework like jackson or gson, while this presentation he felt pretty offended by this question

a couple of weeks later i met him and he was full of thanks for me, because i showed him, that there are frameworks like that, and even said sorry for feeling offended

- no incompentence here -

Story 2:
once i had a lead dev, who was so self-confident, he refactored (for no reason but refactoring itself) half the app and commited without trying to compile/run test

but not only once, but on a regular basis

as you may imagine, he broke the application multiple times and blamed the other devs

- incompentence warning-

Story 3:

once i had a dev, which wanted to stay up with the latest versions of his libraries

npm update && commit without trying to compile/testing multiple times

- incompentence warning-

Story 4:

once i had a cto

* thought email-marketing is cutting edge
* removed test-systems completely to reduce costs
* liked wordpress
* sets vm to sleep without letting anyone know

- i guess incompetent alert -