The engineering letter / 01
October 12, 2026 · By Aleksandar Popovic
This issue is about keeping the evidence close: a small test for an AI-assisted change, a source revision behind a project walkthrough, and a backup for the notes you make while learning.
Start with a deliberately faulty function, explain the failure, and make a bounded change. The downloadable workspace includes tests and separate worked solutions. You can complete every exercise locally with Node.js 20+.
Export your book notes, bookmarks, completed sections, last reading position, and learning checklists as one file. Preview a backup before restoring it, and keep existing entries when merging. The file remains on your device.
Back up your reading workspace →The open-source project pages connect architecture decisions, documented setup, pinned source revisions, and verification evidence. Each demonstration states whether it shows a local workflow, component tests, or a browser preview.
Read the public engineering case studies →Follow the article and site-update feeds →
Have a correction or a practical question? Get in touch.