Understanding Race Conditions in Backend Systems and How to Solve Them with Expr

<p>Executive Summary: To eliminate race conditions in a high-concurrency ticketing system, I implemented PostgreSQL's FOR UPDATE clause for row-level database locking alongside Go

<p>Most invite-link implementations look correct in development and break in production. The edge cases aren't exotic — they're the normal concurrency you get when two people

<p>I was asked to look at a fintech backend where something small but persistent kept happening. Every month when the finance team tried to close the books, the internal ledger