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A posting product lets an author write now and publish later. Design the path from submission to publication, then keep it correct when authors edit, cancel, and retry while delivery fans out to followers. This independent, original scenario is designed for Software / Infrastructure preparation. Work through the stages in order, explain each decision, and use the review dimensions to test whether the result remains defensible when constraints change.
An author edits one post and cancels another, both seconds before their publish time. Define the allowed transitions, and say what happens to an edit or cancellation that arrives while publication is already in flight.
Do you reason about the race rather than the happy path?Make publication idempotent across retries and duplicate workers, and explain how that guarantee interacts with fanout to followers. Say what a retry after an ambiguous timeout must do.
Can you bound duplicate side effects without dropping the post?Add local-time scheduling, a limit on how much an account can queue, and the telemetry that shows scheduling falling behind. Name the one signal you would wake someone for.
Does the operational story match the failure the product would actually hit?Use these checks after a first draft. They are review prompts, not six more questions to answer.
Clarifies goals, constraints, and ambiguous requirements.
Protects invariants and handles boundary conditions.
Identifies realistic failures and designs recovery paths.
Makes ownership and transitions explicit.
Provides enough visibility to diagnose and run the system.
Explains what is gained, lost, and intentionally deferred.
Use a different system, project, or situation and check whether the structure still produces a specific, defensible answer.