Andrew Healey’s site is the personal blog of a software engineer who writes about software, with an emphasis on understanding how things work and making them faster. The archive spans 129 articles and roughly 185,000 words, all published openly on the site.
The content leans toward performance and systems topics: SIMD optimizations, disk-usage tooling on macOS, goroutine-based alternatives to grep, LLM tokenization, and building a JavaScript runtime, a tiny shell, and a cancelable semaphore in Go from scratch. Posts typically pair explanation with concrete implementations and measurements.
The author has worked at Vercel since 2021 on the distributed build pipeline that runs untrusted customer code, which informs some of the infrastructure-related writing. There are also sections for projects and shorter notes alongside the main article feed.
This is best suited to experienced developers, performance enthusiasts, and anyone curious about low-level implementation details. Newcomers may want to start with the notes or project pages before diving into the longer benchmark-heavy pieces.
Subscription is available via RSS, and the code and writing are openly accessible, making it easy to follow along or revisit specific articles.
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