Notes on backend systems, performance work, and the tooling around shipping software.https://mehboob.dev/en-ushttps://mehboob.dev/blog/the-edge-said-hit/https://mehboob.dev/blog/the-edge-said-hit/Cloudflare was caching this site's assets and reporting it on every response. The browser was still revalidating all six of them on every visit, because of a default header I had never read.Mon, 24 Aug 2026 00:00:00 GMThttps://mehboob.dev/blog/designing-a-cli-for-agents/https://mehboob.dev/blog/designing-a-cli-for-agents/rmine was built for two callers from the start: me at a terminal, and a coding agent. The design decisions that only make sense because of the second one.Thu, 20 Aug 2026 00:00:00 GMThttps://mehboob.dev/blog/three-agents-that-dont-trust-each-other/https://mehboob.dev/blog/three-agents-that-dont-trust-each-other/An effort estimator built out of three subagents. The decisions that mattered were about what to withhold from each one, not what to tell them.Wed, 19 Aug 2026 00:00:00 GMThttps://mehboob.dev/blog/the-sync-job-that-took-half-a-day/https://mehboob.dev/blog/the-sync-job-that-took-half-a-day/A device sync was running 12 to 15 hours against millions of software records. The fix was batching and eager loading, but the lasting part was measuring first.Tue, 18 Aug 2026 00:00:00 GMThttps://mehboob.dev/blog/two-years-before-i-published-it/https://mehboob.dev/blog/two-years-before-i-published-it/bitwise_attributes packs boolean flags into one integer column. Most of what makes it a library rather than a snippet came from the gap between those two things.Mon, 17 Aug 2026 00:00:00 GMThttps://mehboob.dev/blog/building-on-a-dom-that-isnt-mine/https://mehboob.dev/blog/building-on-a-dom-that-isnt-mine/A 300-line Chrome extension that adds a translate button to WhatsApp Web Status. One commit fixed four bugs, and all four came from the same wrong assumption.Sun, 16 Aug 2026 00:00:00 GMT