A SEO developer is responsible for the on-page optimization of websites to improve their search engine rankings. This involves working on factors such as site structure, code, content, and keyword density. In addition, SEO developers also research competitor websites and identify areas where they can improve.

Cloaking, keyword stuffing, copying content from another site, exchanging or trading links, buying links, hiding text, and using a link farm are all underhanded techniques frowned upon—and penalized—by Google.

SEO—short for search engine optimization—is about helping search engines understand your content, and helping users find your site and make a decision about whether they should visit your site through a search engine.