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I asked Codex to cancel my annual Medium subscription and request a refund. Five minutes later, the job was done.

A practical case study on using Codex and a Chrome extension to redesign Mercadona’s classic website without replacing its underlying logic.

How I turned mobile UX improvement into an automated loop that measures, tests, and keeps only changes that move the score from 54% to 100%.

Ten practical rules I use with Cursor, Claude Code, and ChatGPT to reduce noise, preserve context, and get cleaner, more maintainable code.