RexLab: The Dig Site
RexLab's games each had a look of their own. This week they became one world, a dig site from sky to bedrock, drawn first and approved by eye before any code merged.
iOS tech lead · building with AI agents
Notes from building software with AI agents, and the Swift years before them.
I lead iOS development at a bank and build products with coding agents that work from specs and tests. This is where I write down what works, what didn't, and why.
Built with agents
Portfolio →
RexLab
A dinosaur learning game for children aged 4 to 7.
React · TypeScript
FolioTell
An offline iPhone app that reads your notes aloud.
SwiftUI · Swift Testing
$ agister run review
resolve ✓ 3 definitions
admit ✓ budget 1.20 USD
record runs/7f2c/
Agister
A runner for AI-agent work defined in settings files.
Go
Agonara
Learning programs your own agent can work on.
Node.js · SQLite
Mizan BLE
An iPad and an iPhone agree a payment over Bluetooth.
SwiftUI · Core Bluetooth
Latest writing
All articles · Tags →Agonara Session: Reading a Lecture on a Phone
Agonara Session lets a student read an Agonara course on a phone, first in a Telegram bot, then as a web page on the local network. Why a lecture is paged by screen rather than by section, what Telegram messages can and cannot do, and how a Go runner redeploys itself when trunk moves.
Audelin: Reading While the Words Arrive
Speaker symbols, readable selections and a viewport that stays put make Audelin's live transcript easier to follow while the conversation continues.
Audelin: A Millisecond to Update the Transcript
Audelin's live transcript used to rebuild the whole call whenever a word changed. Making the work follow the live tail brought a late view update from hundreds of milliseconds to about one.
Mizan BLE: the Till Next Door
A phone that pays at a till must never pay the till next door. How Mizan BLE picks the nearest host by smoothed signal strength, what a real iPad and iPhone measured, why the first picker flickered at arm's length, and what iOS does not let a Bluetooth payment do.
Mizan BLE: Every Way a Transaction Ends
A payment over Bluetooth has one way to succeed and many ways to stop. How Mizan BLE splits each side into a chain of state machines, why the countdown stops once the amount is sent, and how an iPad ends a link it is not allowed to close.
Mizan BLE: a Payment Between an iPad and an iPhone over Bluetooth
Mizan BLE is a proof of concept in which an iPad at the till and a payer's iPhone agree a payment over Bluetooth Low Energy. What it is, which device plays which Bluetooth role, and how the four characteristics of one service carry a whole transaction.
Agonara: Grading Open Answers with a Model
Agonara can grade a student's open answer with any model behind an OpenAI-compatible endpoint. The model grades per criterion, its output is validated before a student sees it, and the work runs as a leased, retried, budgeted job.