A site that ranks on Tuesday can drop out of the index by Thursday. A release copies staging robots rules, a tag manager adds a second canonical, or a new app hides the main content from the first HTML response. Technical SEO is how you catch that. We check what a crawler can actually fetch, set clear index rules for each type of page, and hand engineering a ticket with a clear test, then check again after the next release.
If you don't yet know what's broken, an SEO audit is the better starting point. Titles and page copy are on-page SEO, deciding what to write is content SEO, and moving host or CMS is migration SEO. Technical SEO runs alongside all of them and keeps crawling, rendering and indexing healthy while they happen.
We won't sell you a sitemap ping as a recovery plan, or blend Core Web Vitals into one flattering number when the page that converts is the slow one. If your stack can't produce HTML at all, custom SEO may need to handle the rebuild, and we'll document the rendering gap so that work has a clear brief.