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by e12e 1241 days ago
On a small project I used sequence diagrams to document a custom Api/data flow, so that another team (different company) had a reference for implementing the client to my (bespoke) JSON/REST server.

I frequently draw simplified architecture and data/entity diagrams that tend to be "mostly" UML.

Generally on a whiteboard while discussing design/architecture - rarely do they end up as permanent artifacts/documentation.