I’m suggesting you invest in reading a book on https://www.LeanPub.com called “Algebra-Driven Design”.

the reason I’m suggesting it is that the complex-requirements you’re being persecuted-by, are exactly the sort of thing that that book can help with.

( I’m presuming you code )

By creating the domain’s algebra, & using meta-programming, you can prevent whole categories of bugs.

I only got part-way into the book ( I’m braindamaged, & have beenfailing to learn programming since the 1980’s, when I lost 1/10th of my brain-volume ), but being able to create an APi with ZERO bugs in it, is part of what I’d seen in that book.

I’m a huge believer in keeping requirements divided into dimensions, & keeping those dimensions orthogonal, because once you fail in doing that, you’re fscking doomed.

Here: got the link for you:

https://leanpub.com/algebra-driven-design

_ /\ _

Wasn’t there a competitor named Mattermost?

a FLOSS competitor?