Field notes

Writing

Notes from building and shipping mobile apps.

A volunteer's phone showing a valid ticket scan at a concert gate with no mobile signal, while results wait to sync.

AndroidOffline-firstArchitectureCase study

Letting Thousands of Concert-Goers In Without Reliable Internet

How we built an offline-first Android ticket scanner that decided every scan on the device and reconciled with the server later.

October 29, 20269 min read

A phone with a locked screen receiving events over Bluetooth from a vehicle-mounted unit and sending them to the cloud.

FlutterAndroidiOSBLE

Keeping a BLE Connection Alive in the Background with Flutter: What Actually Worked on Android and iOS

October 29, 20267 min read