It seems a little strange to me that this is an announcement with a title you’d expect for an announcement, but it doesn’t actually announce anything and leaps straight into a job description—not in a careers section but in the blog.

Suggestions on how to categorize it? I initially started with something random, and that failed right away, didn't see first off how to add new category.

I hardcoded categories into the content definition with the intention of keeping them consistent, which may be too extreme.

But I wouldn’t recategorize it, I’d write the post as an announcement by giving it a proper introduction.

If it’s worth making a category for job listings, and those listings won’t stay up perpetually (like blog posts presumably should), it’d make more sense to make a separate hiring or careers page instead. Then use the blog to promote new positions if/when necessary instead of being their canonical home.