I'd say that "Hashnoders", as well as "Hashnode users" are acceptable terms, because that's what we are.
"Hashnode community developers", imho, sounds more like devs who are working on an OSS project, or people who develop the Hashnode community in a social sense. I would think of you, the Hashnode team, as such people.
Other terms which might come to mind... dunno 🤔, I never really thought about it. Will tell you if anything comes to mind, though 😉