@qwertyboy0325

Ezra Wu

@qwertyboy0325Taipei, TaiwanJoined June 2026

Backend reliability, data correctness, and incremental modernization.

About

I work on backend systems with event-driven workflows, transactional boundaries, multi-tenant data, and legacy systems that need to change without being replaced all at once. I write about failure modes, data correctness, and the implementation choices behind them: what breaks under retries or concurrency, what a fix actually guarantees, and what it does not.

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Ezra Wu's blogs

qwertyboy0325 — Engineering Notesqwertyboy0325.hashnode.dev1 post

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Recently published

EWEzra Wuqwertyboy0325.hashnode.devJul 3 · 9 min read

FOR UPDATE SKIP LOCKED Was Not Enough: A Stale Failure Write Race in an Inbox Processor

Why a post-rollback failure transition needs its own serialization boundary. I found this while auditing a reliability claim in a small inbox processor. The processor used PostgreSQL, multiple worker

Ezra Wu

About

Available for

Ezra Wu's blogs

Recently published

FOR UPDATE SKIP LOCKED Was Not Enough: A Stale Failure Write Race in an Inbox Processor

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Ezra Wu

About

Available for

Ezra Wu's blogs

Recently published

FOR UPDATE SKIP LOCKED Was Not Enough: A Stale Failure Write Race in an Inbox Processor