My React app had a 94 Lighthouse score, a sub-2s load time, and zero organic traffic after three months. Not "low traffic." Zero. Not a single impression for any keyword I had written content for. I'd completely skipped SEO analysis. Not because I didn't care, because I assumed a good Lighthouse score meant I was fine. It doesn't. This is a practical guide to SEO analysis for developers , the part that actually matters, the part nobody teaches in your frontend course, and the part that will determine whether your app gets discovered or stays invisible forever. What SEO Analysis Actually Means for a Developer Most SEO guides are written for marketers. They talk about "content strategy" and "keyword clusters" and almost never show you a terminal command or a line of code.…