Every site I ship runs on a system I wrote. One typed schema describes the business, and from it the pages derive their metadata, JSON-LD structured data, sitemap, canonical URLs and hreflang graph. Nothing is hand-written per page.
That sounds like an implementation detail. It is actually the whole argument. Hand- maintained SEO markup is correct on launch day and wrong three content edits later, because nobody remembers to update the structured data when they change a price. If it is derived, it cannot drift — and a fix I make once reaches every page and every client at the same time.
It is covered by an automated test suite, and the rules it enforces came from real mistakes rather than a checklist. One example: a page can now declare which languages it actually exists in, because a sitemap once advertised eight URLs for a site that had two.
All of it is public: the framework is on GitHub along with everything else I have built. You can read the code before you decide whether to trust the description of it.
One thing to know before you open it: the code and comments are written in Turkish. That was a deliberate choice for a codebase whose only maintainer thinks in Turkish, but it does mean the English documentation is where to start — there is about 1,400 lines of it, and the architecture notes explain which trade-offs were made and why.