OpenAI Codex plus GPT-4.5 can take a complete beginner from zero to three working apps, web, desktop, and iOS, in a single session. Riley Brown's full course runs roughly 54 minutes and covers the entire production stack: Firebase for database, auth, and storage; GitHub for version control; Vercel for deployment; and the GPT API for in-app AI features. No prior coding knowledge is assumed.
The technical density here is the reason to watch in full. Brown does not stop at a toy demo. He shows the browser console during debugging, walks through Firebase security rule failures and fixes them live with Codex, and explains the difference between queuing prompts and steering an agent mid-task, a distinction most vibe-coding tutorials skip entirely. The iOS conversion path, starting from a web app and ending with a running native build, is demonstrated with actual results on screen at the 50-minute mark.
The workflow this video describes, natural language prompts driving a full-stack build across three platforms, is where entry-level development is heading in 2025 and 2026. If you want to understand what Codex actually does under the hood versus what the marketing says, the chapters between 24:49 and 39:02 are the ones to study.
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