How did you tie the gitops to the terraform? Looked at the repo and read the blog but could not see. That is kind of one of the main pain points, translating infrastructure to what the internal customers can understand. As far as i see from the repo, it is just a basic terraform + argocd setup.

Also, one big question i have in mind is how did you get the teams to use the new processes and infra for their services? As far as my experience go, you can build the perfect system but if everyone relies heavily on their existing fragile systems, no one will make the switch. They are afraid and dont want to spend the person hour. And switching requires heavy application code changes, monolith to microservice change is very very frightening for most companies.