Developer builds custom GPS watch app in ~7 AI-assisted iterations without learning the SDK

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An experienced developer built a fully functional GPS route-recording app for his Zepp OS smartwatch without studying the platform's SDK, relying instead on AI-assisted vibe coding cycles. The app records motorcycle and hiking routes, allows waypoint marking via physical button without removing gloves, and exports GPX files. Rather than studying the platform first, the developer described desired behaviors in plain language, received code and a QR install link from the AI, then tested each version in real-world conditions. After roughly seven iterations, the original feature specification remained intact with no scope creep, as the developer focused on defending the spec while the AI adjusted the implementation. The process shifted his role from coder to specification writer and field QA tester, with his programming background proving valuable for scoping requests, spotting edge cases, and reporting precise bug descriptions.

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