We have something similar to this in Antwerp, Belgium.

Most of our solutions are built on top of a kubernetes-powered microservices platform, with an API-first design approach. It is called the Antwerp City Platform as a Service (https://acpaas.digipolis.be).

To ensure technological consistency we have a Digipolis Antwerp Application Stack, which is the technological foundation for new projects. https://docs.google.com/spreadsheets/d/e/2PACX-1vR9N3gAJoJFI...

And finally for UI consistency, we have a design system called Antwerp UI (https://antwerp-ui.digipolis.be), which includes a custom-designed font meant to evoke the city's historical architecture, used both for internally facing web apps, and for our public facing website https://www.antwerpen.be