How I built AIReady.sg alone, after hours, with no grant — and the engineering decisions that made it affordable to run. A 25-industry by 6-role framework generated offline in Claude Code; 5,100 personalised lesson snippets pre-built and slotted into otherwise-static lessons, served from a database with no live model call; and a runtime report path that fetches a company’s own page and grounds itself on pre-generated research instead of paying for web search on every use. The recurring cost fell well over 90%.