It appears to be an abstraction on top of Pulumi/Terraform (it's clearer on their homepage, which refers to both: https://nitric.io/) that abstracts over the underlying cloud resources (which tend to be cloud-dependent) with higher-level concepts like "buckets" and "services".

Just wanted to take the time to appreciate this comment. It is a rare thing when someone takes the time to read beyond the headline, and decide to dig deeper to understand something. Thank you.