Writing

Letting an AI agent drive a Mac app for UI testing: four approaches that failed, and why the macOS accessibility tree worked as a test API for FynPDF.

The latency numbers every programmer should know, scaled to buildings, cities and states so nanoseconds, microseconds and milliseconds finally feel different.

Cutting a Go cron job's peak memory from 16.5 GB to 50 MB with streaming queries, bounded concurrency and a buffered writer.

How I spent way too much time optimizing a children's counting game and went from 2 MiB/s to 3 GiB/s. No regrets.

Recreating Apple's Diwali logo in SwiftUI by turning an SF Symbol into a strokeable Shape with the Vision framework's contour detection.

An iterative Swift version of C++'s next_permutation that generates every permutation of a string in lexicographic order, with the algorithm explained.

When your CPU has an identity crisis: some cores want to run fast, others want to save battery, and the OS has to play therapist.

USB-C beats Lightning on paper, so why does my phone's USB-C port wear out while my old iPad's Lightning port keeps going? Notes on port design and durability.

Windows programming pitfalls for beginners (and veteran idiots like me)

How a stubborn refusal to Google an error message properly led me down the rabbit hole of programming.

I built an AI to surprise me with gifts. It worked a little too well.