What would you guys use for state management in a larger Rum application? Just atoms or some 3rd party library?

Have a look at citrus https://github.com/roman01la/citrus

Hey @roman01la, I have definitely considered your library, since I already played with re-frame. One thing I like about re-frame is interceptors with after for local storage or spec checking. Is there something similar in Citrus I am missing from the docs?

Can it be replicated using effect handlers?

No, there’s no such a thing. Maybe I’ll add it in the future