[mbag]

It was probably done using RFDs (Requests for discussion),. You can read more on the process here [1].

But someone from Oxide would need to tell you exactly how many RFDs took to desing and implement Hubris.

[1] https://oxide.computer/blog/rfd-1-requests-for-discussion

[steveklabnik]

There was an RFD for Hubris; it laid out the basic concepts and design goals, as well as non-goals. But after that, it's largely just iterating. When I joined there were four or five people working on Hubris regularly; we have weekly meetings where we sync up, talking about what we're working on, and discuss things.