As a developer, you might think SEO is someone else's job. But the truth is, a huge part of technical SEO happens in the code you write — and small decisions you make can make or break how well a site ranks.
Here's what actually matters:
Site speed is a ranking factor
Google explicitly uses Core Web Vitals (LCP, FID/INP, CLS) as ranking signals. Unoptimized images, render-blocking JS, and bloated bundles hurt more than most devs realize.-
Semantic HTML helps more than you think
Using proper–
hierarchy, , , and alt attributes isn't just accessibility best practice — it helps search engines understand your content structure.
Mobile-first isn't optional
Google indexes the mobile version of your site by default. If your responsive design breaks or hides content on mobile, that's what gets indexed.Clean URLs and proper redirects
/blog/post-title beats /blog?id=4521. And when you change URLs, a 301 redirect (not a 404) preserves the SEO value you already earned.Structured data (schema markup)
Adding JSON-LD schema helps your pages show up as rich results — star ratings, FAQs, breadcrumbs — directly in search results, which boosts click-through rate significantly.
Why this matters for your career
Developers who understand SEO fundamentals are more valuable — you can catch performance and structural issues before they ever reach a marketing team's radar, and it makes you a much stronger full-stack or freelance candidate.
If you're curious about the marketing side of things — content strategy, SEO, paid ads — I write about that at
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