Most developer guides on SEO are written by marketers. They tell you to find the right keywords or write better meta descriptions. While that matters for content, it does not help if your site is a black hole for crawlers.
As developers, we control the infrastructure. If the crawler cannot parse your page or if the Largest Contentful Paint (LCP) is five seconds, your keywords are useless. Here is the technical stuff that actually moves the needle.
The Client-Side Rendering Trap
If you are using a modern framework like React, Vue, or Angular without a rendering strategy, you are playing a dangerous game. While Google claims they can execute JavaScript, they do it in two waves. First, they index the raw HTML. Then, they come back later to render the JS.
This second pass is expensive for them. If your content only exists after a useEffect call or a client-side fetch, you are delaying your indexation.
