REWRITING A NODE.JS SERVICE IN GO WITH AGENTS

Summary from the TLDR Dev newsletter

Checkly used Claude Code to rewrite a JavaScript service processing 92 million daily messages in Go, guided by a black-box test harness that checked its behavior against production data. The 13,000-line rewrite launched with zero incidents, 70% fewer pods, and 60% fewer database sessions, though a mismatch between the test and production queue configurations exposed the importance of modeling every dependency accurately