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Things I have built end to end — the problem, the approach, and what I would do differently next time.
A collaborative markdown scratchpad that survives going offline.
A read-through cache proxy that speaks the Postgres wire protocol.
Bookmarking that works on the underground and syncs when it doesn't.
Incident timelines that assemble themselves while you are still firefighting.
A cron expression parser small enough to read in one sitting.
Log ingestion with a query language you can actually remember.