How can a self-learner build professional software-engineering craft?

Question

How can a self-learner build software-engineering craft, ship their own products and work well with coding agents? What mid-level engineering craft means, which free resources build it, how to ship to a professional standard, what the evidence says about learning with AI coding agents, and how to earn merged open-source PRs, from public career ladders, course pages, platform docs and 2025–26 studies, September 2026.

Why it matters

Shipping your own products, with or without coding agents, takes craft that tutorials skip.

The full research is in the research notes.