Guides
7 guides on sequence diagram. Practical writing from the team building Atlas, useful whether or not you buy anything.
Payment flows fail in expensive ways: double charges, lost captures, missed webhooks. Diagramming authorization, capture, and the async callbacks is how you get the edge cases right before real money moves.
A REST API looks simple as a list of endpoints and complicated the moment you draw the calls, auth, and errors together. Diagramming it exposes the design before clients depend on it.
Sequence diagrams are where PlantUML shines, because it lays them out itself rather than deferring to Graphviz. This tutorial takes you from a two-line diagram to loops, alternatives, and activation bars.
Authentication is where security bugs hide, and most of them are flow bugs. Diagramming the login flow before you build it exposes the gaps that code review often misses.
Sequence diagrams are the sharpest tool for designing an API, because they force you to think about the full conversation (including the failures) before you build it.
Sequence diagrams show how objects collaborate over time by exchanging messages. This guide covers lifelines, message types, activation, and the fragments that model real control flow.
Sequence diagrams show how parts of a system talk to each other over time. Mermaid makes them fast to write and easy to keep current.
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