Production patterns for backend engineers who are tired of hello-world tutorials.
Senior full-stack engineer and engineering lead with 5+ years building cloud-native systems at scale. I write about the things the docs don't cover — GCP, FastAPI, Terraform, event-driven architecture, and AI-powered backends. No hello-world demos.
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Arnold Holm
One failure case worth adding to the cache example: the fetch takes longer than the five-second lock. A second worker acquires a new lock, then the first worker's finally block deletes it. The unique token and compare-and-delete from section 4 would protect this path too. A test with a deliberately slow fetch would make the difference visible.