Codeminer42's Engineering Blog
What Codeminer42 engineers dig up at work: field notes on Rails, AI tooling, security, and keeping product teams shipping.
There's a question that keeps coming back every time some colleagues and I see a coding agent doing something impressive: "ok, but it has seen millions of examples of that. What happens when it hasn't?" A lot of what makes…
In October 2026, a researcher found out that eight intermediate certificates issued by eMudhra (a certificate authority, one of the ~140 organizations whose signature your browser and operating…
An agent opens a file, sees a strange-looking loop, and "simplifies" it. The loop was strange on purpose. Someone had chosen it months earlier, after an incident, in…
A few weeks ago I picked up a ticket that said, more or less, "implement the auth layer." The application already had authentication working, so the first job…
The comment started with three words: This breaks prod. It was a PR of about five hundred lines -- in a repo I had just encountered, and I…
I built a dojo where Claude Code tutors you and refuses to type your code. Making that refusal stick took four tries, and the result is a recipe for packaging any team workflow as a plugin.
