Book: The Complete Guide to Go Programming Also by me: Thinking in Go (2-book series) — Complete Guide to Go Programming + Hexagonal Architecture in Go My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub A backend engineer I worked with had a translation pipeline. A thousand documents go in, a thousand translated documents come out. The first version used errgroup.WithContext because that is what every Go talk on YouTube reaches for. One document failed to translate because the upstream API rate-limited that single tenant. The context cancelled. 999 documents that were already translated got thrown away, and the retry job ran the whole batch again. The cloud bill went up. The bug was not in the code. The code did exactly what errgroup documents. The bug was that someone picked errgroup for a job where you want to collect everything, not fail-fast on the first error.…