When developers build a website, the main focus is usually on making it fast, functional, responsive, and secure. SEO often comes later.
A website can have great content and a beautiful design, but if search engines cannot properly crawl, understand, or index the site, ranking becomes much harder.
The good news is that many technical SEO problems are relatively easy to identify and fix.
Here are 10 technical SEO issues developers should check before spending too much time chasing backlinks or adding more content. Blocking Important Pages in robots.txt
The robots.txt file tells search engine crawlers which parts of a website they should or shouldn't access.
I've also seen situations where a staging rule accidentally makes its way into a production website.
Make sure important pages, CSS, JavaScript, images, and other crawlable resources aren't accidentally blocked.
Developer tip: Don't assume that a robots.txt file with no syntax errors is automatically correct. Check what it is actually preventing crawlers from accessing. Pages That Can't Be Indexed
A search engine may successfully visit a page but still decide not to include it in its index.
This can be useful for private pages, admin areas, staging environments, or temporary pages.
But if it appears on an important landing page, you're basically telling search engines:
Also check HTTP response headers because noindex can sometimes be sent there as well. Missing or Incorrect Canonical URLs
Canonical tags help search engines understand which URL should be considered the preferred version when multiple URLs contain similar or duplicate content.
Point every page to the homepage Use HTTP instead of HTTPS Point canonical URLs to redirected pages Use incorrect URLs Create conflicting canonical signals
For example, if /blue-shoes has a canonical pointing to /, you shouldn't be surprised if the product page struggles to appear in search.
Canonical URLs should normally point to the preferred, indexable version of the page. Poor URL Structure
If a URL must change, use an appropriate permanent redirect rather than leaving the old URL broken. Broken Internal Links
Broken internal links aren't just annoying for users. They can also make crawling a website less efficient and weaken the site's internal linking structure.