Blog / tag
mobile
3 posts.
The night we sent 40,000 push notifications at 03:14
A daylight-saving transition, a cron expression in the wrong timezone, and a retry loop with no idempotency key. A postmortem.
Shelter Wi-Fi is a hostile network
Staff enter animals standing in a kennel corridor with one bar of signal and a dog on a lead. Offline-first was not a nice-to-have; it was the only design that worked at all.
Twelve megapixels of dog
Shelter staff upload photos straight from a phone camera. We were paying to move 8MB files across a bad connection to produce a 400px thumbnail.