Spec First, Code Later: My Spec-Driven Development Adventure with AI

Spec First, Code Later: My Spec-Driven Development Adventure with AI Introduction Lately, I've been seeing a lot of "I vibe-coded this thing!" posts popping up everywhere. Being able to build something just by going with the flow -- that's pretty amazing in its own right. But what I wanted to try was a slightly different approach: Write the specs first, then let the AI do the coding -- Spec-Driven Development. I happened to have an upcoming presentation at work, and I went looking for a timekeeper app that fit my needs. Couldn't find one. Since I knew exactly what I wanted, and I had the perfect excuse to experiment, I thought, "Why not build it myself?" This is the story of that experience. What I Built PresentationTimekeeper https://presentation-timekeeper.pages.dev/ A timekeeper app for presentations. Runs entirely in the browser (frontend only, no server needed) Set expected durations per section, track progress in real time Import/export settings as JSON Built with Vanilla JavaScr