I like the use of CUE in this repo, they seem to be using it for different purposes, interesting.

Hugo here, founder at Namespace. We built Foundation based on what we learned from building Boq at Google — the app platform that drives the dev/prod workflow of many of Google’s main apps.

We leaned heavily on composition that spans build, test and production. You can define assets that yield code-level infrastructure definitions and also are automatically configured based on environment (dev vs test vs prod).

It was great building it, and we use it to build Namespace (namespace.so); our development-focused platform.