Devvista is a software development company that also builds and audits websites for technical SEO, which gives us a genuinely different vantage point on this topic than a typical marketing-only SEO agency. Content strategy and backlinks get most of the attention in SEO conversations, but a technical problem underneath a site can cap how well any of that work performs, regardless of how good the writing is or how many links point at it. This checklist covers what to actually check, in the order it tends to matter most.
01 Can Google Actually Crawl and Render Your Site
Start by checking your robots.txt file is not accidentally blocking important sections of the site, which happens more often than most business owners assume, particularly after a site migration or a redesign. Confirm your XML sitemap is submitted in Search Console and actually includes the pages you want indexed, not just a default sitemap the platform generated without review. If your site is JavaScript-heavy, verify Google can render the content itself, not just the initial HTML shell, using the URL Inspection tool in Search Console directly.
02 Are Your Core Web Vitals Actually Passing
Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift are real ranking factors, not just user experience nice-to-haves that only matter for conversion. Check your scores in PageSpeed Insights or the Core Web Vitals report in Search Console directly. Common culprits behind poor scores include unoptimized images, render-blocking JavaScript loaded before critical content, and web fonts loading without a proper fallback strategy that causes visible layout shift as the page loads.
03 Is Your Site Structure Actually Crawlable and Logical
Every important page should be reachable within a few clicks from the homepage, with a clear internal linking structure connecting related content together. Orphaned pages, meaning pages with no internal links pointing to them at all, are hard for Google to discover and rarely rank well no matter how good the content on them actually is. A simple audit tool can identify orphaned pages quickly, and fixing this is usually one of the cheapest, highest-leverage technical SEO improvements available.
04 Do You Have Duplicate Content or Canonical Issues
Check for pages accessible at multiple URLs, such as with and without a trailing slash, with and without www, or both http and https live simultaneously, without proper canonical tags or redirects resolving them to one preferred version. This splits ranking signals across what Google sees as separate, competing pages, weakening both of them in search results rather than consolidating authority into a single strong page.
05 Is Structured Data Implemented Correctly
Schema markup for your organization, services, articles, and FAQs helps Google understand your content more precisely and can unlock rich results in search, including FAQ accordions, breadcrumbs, and review stars where applicable. Validate your markup with Google's Rich Results Test rather than assuming it is correct simply because it is technically present on the page somewhere in the source code.
06 Is Mobile Performance Actually Good, Not Just Responsive
Google indexes and ranks primarily based on the mobile version of your site, not the desktop version, which surprises some business owners who still review their site primarily on a desktop monitor. Responsive design is table stakes at this point. The real question is whether mobile load speed and usability actually hold up under real conditions, not just whether the layout resizes without visually breaking.
07 HTTPS and Security Signals
A valid SSL certificate covering the entire site, not just the homepage, is a baseline requirement at this point, both for user trust and as a minor but real ranking signal. Mixed content warnings, where a secure page loads insecure resources, undermine this and are worth checking for specifically using your browser's developer tools on a sample of important pages across the site.
08 URL Structure and Readability
Clean, descriptive URLs that reflect page content in plain language perform better than long strings of parameters or auto-generated identifiers that mean nothing to a human reader. This matters both for how users perceive a link before clicking it and for how clearly Google can infer what a page is about from the URL alone, which is a small but real signal among many others.
09 Redirect Chains and Broken Links
Multiple redirects chained together, where one URL redirects to a second URL that then redirects to a third, waste crawl budget and slow page load for users following that path. Broken internal links, pointing to pages that no longer exist, waste crawl budget in a different way and create a poor user experience whenever a visitor happens to click one. Both are worth auditing periodically, particularly after any site restructuring or content cleanup project.
10 Putting a Technical Audit Into Practice
Running through this checklist once does not mean the work is finished permanently. Technical SEO health degrades gradually as a site adds pages, plugins, and features over time, which is why a periodic re-audit, ideally tied to any major site change, catches new problems before they compound into a meaningful ranking impact that takes months to fully recover from once identified.
→ Related Resources
A few pages worth a look if you are deciding on next steps.
11 Technical SEO for JavaScript-Heavy Sites
Modern web applications built with React, Vue, or similar frameworks introduce technical SEO challenges that a traditional server-rendered site does not face in the same way. If content is rendered entirely client-side, Google needs to execute JavaScript before it can see the actual content, which historically has been less reliable than reading plain HTML directly and can introduce indexing delays or gaps depending on how the site is architected. Server-side rendering or static site generation approaches solve this by ensuring meaningful content is present in the initial HTML response, which is a technical decision that should be made deliberately during a site's architecture phase rather than discovered as a problem after launch, when it is considerably more expensive to retrofit into an existing application.
12 Working With a Technical SEO Partner
Most marketing-focused SEO agencies can identify technical SEO problems using standard tools, but cannot fix the underlying code themselves, which means every technical recommendation becomes a separate, often slow handoff to a developer who was not part of the original diagnosis. A development partner who understands both the technical and SEO sides can close that gap directly, moving from diagnosis to fix without the coordination overhead a typical agency and developer relationship introduces, which is often the difference between a technical SEO recommendation actually getting implemented and it sitting in a backlog indefinitely.