Jeff Hajewski

Reliable AI systems, evals, context, and performance economics.

The Art of Elixir

I wrote The Art of Elixir as a book about writing clear, maintainable systems software. It sits earlier in my work than the current AI focus, but it reflects the same values: sharp abstractions, operational simplicity, and engineering judgment that survives contact with production.

Clear abstractions

The same engineering taste that makes a good Elixir system readable also makes larger platforms easier to operate.

Operational calm

Reliable software is not just correct in theory. It stays legible when it is under load, evolving, or failing in production.

Judgment over ornament

Good engineering writing should sharpen taste, not hide behind vocabulary. That applies to books and to production systems.

The through-line from Elixir to AI systems is straightforward: the technology changes, but the hard part remains the same. You still need software that is understandable, measurable, and durable enough for other people to trust.

Questions about the book can go to email.