The Technical SEO Checklist Most Websites Fail

July 17, 2026 · Next Wave Intelligence

Content and backlinks get most of the attention in SEO conversations, but a technically broken site can hold back even great content indefinitely. Here's the checklist we actually run through — the kind of thing you can only fix in the codebase, not in a content calendar.

1. Can search engines actually reach your pages?

Check your robots.txt isn't accidentally blocking sections it shouldn't, and that your XML sitemap lists every canonical page you want indexed — and nothing you don't. A sitemap that's stale or missing entirely is one of the most common things we find on sites that "aren't ranking despite good content."

2. Is there exactly one canonical URL per page?

Duplicate content isn't just copy-pasted text — it's the same page reachable at multiple URLs: with and without www, with and without a trailing slash, HTTP and HTTPS. Every variant needs a clear canonical tag pointing at one true URL, and ideally a redirect so crawlers and users land on it directly rather than depending on the tag alone.

3. Do your internal links actually work everywhere?

It's easy to build a navigation component that works on the homepage and quietly breaks — or points to the wrong place — everywhere else. Anchor links (#section) in particular tend to be built and tested only on the page they were designed for, then reused site-wide without checking they still resolve from a different route. Crawl your own site the way Google does, not just the page you were working on.

4. Are your Core Web Vitals actually good, not just "probably fine"?

Largest Contentful Paint, Cumulative Layout Shift, and Interaction to Next Paint are measurable, not subjective. Run a real audit rather than assuming a modern framework handles this for you by default — unoptimized images, render-blocking scripts, and web fonts that shift layout on load are the usual culprits, and all three are fixable at the code level.

5. Is your structured data actually valid?

JSON-LD that's present but malformed — or that references entities inconsistently across pages — doesn't get you rich results, and can send confusing signals about what your business actually is. Organization, Service, BreadcrumbList, and Article schema are the highest-leverage types for a services business; validate every one, on every page type, not just the homepage.

6. What happens on a 404, and does anything link to it?

Broken internal links and orphaned pages waste crawl budget and create dead ends for both users and crawlers. Periodically check whether any of your own navigation, footer, or in-content links point to pages that no longer exist or were never built.

The pattern behind all six

Every item on this list is invisible in a design mockup and invisible in a content review. They only show up when someone actually crawls the live site, inspects the rendered HTML, and checks it against what search engines see — which is exactly why technical SEO has to be engineering work, not a content checklist bolted on afterward.

We go deeper on this on our SEO Engineering page, or if you want a straight read on your own site, get in touch.