@orangy also hard to answer 😁
I typically design my backends as JSON APIs (little to no HTML rendering).
I like async pipelines so that a request doesn't have to be handled entirely on one thread.
I'm not as fascinated with devops as I am with my product so a simple way to deploy is nice.
I tend to not like being tied into things like network libraries or database interfaces (orms or mappers, etc...), but pluggable interfaces for these things are cool