Notes on building software systems — architecture decisions, design trade-offs, and lessons from running code in production. Mostly about islet, occasionally about everything else.
The foundation is solid. The daemon runs, the API accepts data, the iOS app logs meals and shows predictions. But "it …
I am a Welsh speaker. Not someone who did a Duolingo streak — I am wholly fluent, and it is my language of choice. When …
On February 15th, islet was a name and some planning documents. By March 7th, it was a daemon running on a Raspberry Pi, …
Until this week, glucore could describe what had happened. IOB and COB curves modelled insulin and carbs in progress. …
The iOS app is for the person wearing the sensor. The Android app is for everyone else. My partner checks my glucose …
The hardest part of carbohydrate counting is not the maths. It is the data. Supermarket food has labels. Restaurant food …
The screen cracked in a way that made the laptop useless as a laptop but perfectly functional as a computer. The M2 …
I run my own email server. On a Raspberry Pi. In my house. It sends and receives real email. People reply to it. It has …
Every project had its own deployment script. islet had deploy_pi.sh. gwefan had a bespoke scp chain. ira had nothing. …
ira started as a telemetry display. Connect to iRacing's shared memory, show speed and RPM, log to CSV. Useful but …