Writing

How this thing is built, including the parts that went wrong.

Engineering notes from building Sourcemap. Nothing here exists to have something to publish. A post gets written when something turned out to be genuinely surprising and the write-up is the part that would have saved somebody else an afternoon.

19 August 2026The open redirect I shipped, and why the fix is four linesIt was in production. It took a URL parser to see it, and a URL parser to fix it.7 min read

These land when there is something to say.

One email when a post or a new tool ships.