When I approach a technical SEO audit, I don’t start by looking for a list of keywords that need to be added to a page. I start by trying to understand how the website is actually built and how that architecture affects search visibility. I want to know whether important pages can be discovered, whether they return the correct responses, whether their content can be processed, whether internal links provide a clear path through the site, and whether technical issues are preventing otherwise useful content from reaching search results.
This becomes even more important as websites become more sophisticated. A traditional content-focused website and a JavaScript-heavy application may require very different technical considerations, even when they are both trying to rank for similar searches.
What Is a Technical SEO Audit?
A technical SEO audit is a structured review of the technical aspects of a website that can affect search engine crawling, rendering, indexing, performance, and organic visibility. The purpose isn’t simply to produce a long list of errors. A useful audit should help identify the problems that matter, understand why they are happening, and determine which improvements are most appropriate for the website.
When I review a website, I don’t look at one technical element in isolation. I try to understand how the different parts work together. A website might have excellent content, for example, but if important pages cannot be crawled or indexed, that content may not receive the visibility it deserves. Similarly, a website may be technically accessible but have a complicated URL structure, weak internal linking, slow pages, or rendering issues that make it harder for both users and search engines to navigate.
This is why I prefer looking at technical SEO as part of the overall architecture of a website rather than treating it as something completely separate from development.
Crawlability Comes First
Before worrying about whether a page can rank well, I want to know whether search engines can actually find and access it. Search engines discover URLs through several signals, including links between pages, XML sitemaps, and other known URLs. This makes the structure of a website particularly important because an important page can exist without necessarily having a clear path through which it can be discovered.
How Search Engines Discover Pages
During a technical SEO audit, I look at whether important pages are linked naturally from other relevant pages, whether navigation exposes the right sections of the website, and whether there are pages that appear to exist without meaningful internal connections. Internal linking matters here because it does more than help visitors move between pages. It also creates relationships between different parts of the website and gives search engines additional paths through which content can be discovered.
Robots.txt and Crawl Restrictions
I also check whether robots.txt is unintentionally restricting access to parts of the website that should be available to search engines. This can happen during development when rules are added for testing and later forgotten, or when an existing configuration is copied into a new environment without being reviewed.
A crawl restriction is not automatically a problem. Some areas of a website should not be crawled. The important question is whether those restrictions match the website’s actual SEO requirements and whether important content remains accessible.
Crawling Is Not the Same as Indexing
One of the distinctions I pay particular attention to during an audit is the difference between crawling and indexing. A search engine being able to access a URL does not automatically mean that the page will appear in its index. There are several stages between discovering a URL and making its content available through search, and technical problems can occur at different points in that process.
This becomes particularly relevant when working with modern JavaScript applications. A page can return successfully, but the content, links, metadata, or other important elements may depend on rendering or client-side behaviour. That means a website can appear completely functional to a person using it while still having technical SEO issues that need investigation.
Checking Which Pages Should Be Indexed
I therefore compare the pages that should be available in search with what search engines are actually able to discover and process. This can reveal situations where important pages are excluded, duplicate URLs are being generated, or pages that should be searchable are not receiving the expected visibility.
Search Console can be particularly useful here because it provides information that cannot always be identified simply by looking at the website in a browser. The goal isn’t to make every URL on a website indexable. A healthy website may intentionally contain URLs that shouldn’t appear in search. The goal is to make sure the pages that matter are technically accessible and presented clearly enough for search engines to understand their purpose.
URL Structure and Site Architecture
I also look closely at how URLs are organised because URL structure is often a reflection of the underlying architecture of the website. A clear structure makes it easier to understand the relationship between different sections and types of content. It can also make internal linking, redirects, canonicalisation, navigation, and future expansion easier to manage.
A website with clearly defined service pages, category pages, and individual articles has a different architectural relationship from an application that generates many URLs through filters, parameters, or client-side routes. During an audit, I look for patterns rather than treating individual URLs as isolated problems. If the same issue is being generated across hundreds or thousands of pages, fixing the underlying architecture is usually much more valuable than manually correcting each URL.
Managing Duplicate and Unnecessary URLs
Problems can appear when a website creates multiple URLs for essentially the same content. Query parameters, tracking parameters, duplicated routes, trailing-slash variations, or inconsistent URL structures can all contribute to unnecessary complexity.
The solution isn’t always to remove every variation. Instead, I look at which URLs represent the actual pages that should be discovered and indexed and whether the website communicates those preferred URLs consistently through its architecture and SEO signals.
JavaScript and Technical SEO
JavaScript deserves particular attention on modern websites because it can change how content is delivered and processed. A traditional HTML page may contain most of its important content directly in the initial document, while a JavaScript application may load the initial structure and then retrieve or generate additional content through scripts.
That approach can work very well for users, but it introduces additional considerations for search. I have explored this in more detail in my article Single-Page Application SEO: How to Make JavaScript Applications Search Engine Friendly, particularly around routing, rendering, metadata, navigation, and indexable content.
Looking Beyond Whether JavaScript Works
When auditing a JavaScript-heavy website, I don’t simply ask whether the application works in the browser. I look at what is actually available to search engines and whether important information depends unnecessarily on client-side execution.
This can include page titles, meta descriptions, headings, visible content, links, canonical URLs, structured data, and the URLs associated with individual pieces of content. The important distinction is that a website working correctly for a human user does not automatically mean that every important SEO signal is being presented in the most reliable way.
This is one of the areas where technical SEO and software engineering overlap quite heavily. Understanding how a website is built makes it easier to investigate why a search visibility problem is happening rather than simply documenting that the problem exists.
Website Performance Is Part of the Technical Picture
Performance is another area I examine because technical SEO isn’t only about crawling and indexing. A website that takes too long to become usable creates a poor experience, particularly on slower connections and mobile devices. Heavy JavaScript, large images, unnecessary third-party scripts, inefficient assets, and expensive rendering can all contribute to this problem.
When reviewing performance, I look beyond a single speed score. I want to understand what is actually making the page slow. Sometimes the problem is an unnecessarily large JavaScript bundle. In another project it may be image delivery, server response time, excessive third-party scripts, blocking resources, or inefficient frontend rendering.
This is one area where having a software engineering background becomes useful because performance improvements often require changes to the implementation rather than simply changing an SEO setting. Reducing unnecessary JavaScript, improving asset delivery, optimising images, introducing better caching, or changing how content is rendered can have a much larger impact than simply running another optimisation plugin.
Internal Linking and Content Discovery
Internal linking is another area that I don’t treat as an afterthought. When a website publishes more content, it becomes increasingly important to establish relationships between related pages. A service page should be connected to relevant supporting content, while useful articles should make it easy for readers to discover related services and deeper resources.
This creates a structure where informational content can support commercial pages rather than leaving every article isolated. For example, an article about JavaScript SEO can naturally reference a broader technical SEO service, while a technical SEO service page can point visitors towards detailed articles explaining specific problems.
The links should make sense to the reader first. When they do, they also create a much stronger internal structure for the website.
XML Sitemaps and Important URLs
XML sitemaps are another useful part of a technical SEO audit, particularly on larger websites. I look at whether the sitemap exists, whether it can be accessed correctly, and whether it contains the URLs that are actually important.
A sitemap should not simply become a list of every URL the website happens to generate. The important question is whether it reflects the site’s intended indexable content. If a website contains thousands of automatically generated URLs but only a smaller set of pages represents meaningful content, blindly including everything can make the site’s technical structure harder to understand.
For content-driven websites, I also look at whether important posts, pages, categories, or other resources can be discovered through a combination of internal links and the sitemap rather than relying on the sitemap alone.
Metadata and On-Page Signals
Although technical SEO is often associated with crawling and indexing, I also review important on-page signals because technical implementation and content structure are closely connected. Page titles, headings, meta descriptions, canonical URLs, image attributes, structured data, and content hierarchy all contribute to how a page is interpreted.
I don’t approach this as a matter of inserting the same keyword repeatedly. Instead, I look at whether the page communicates what it is about clearly and consistently. A page about a specific service should be technically and semantically distinct from a supporting article. A category page should have a different purpose from an individual post. When those relationships are clear, both users and search engines have a better understanding of the website.
What Happens After a Technical SEO Audit?
An audit is only useful if it leads to improvements. Once the technical issues have been identified, I normally separate them according to their impact and the effort required to resolve them. Some issues can be corrected quickly, while others may require changes to the application’s architecture, frontend implementation, backend logic, hosting configuration, or content structure.
I also prefer fixing underlying causes rather than repeatedly treating symptoms. If hundreds of URLs are being generated incorrectly, for example, manually correcting a handful of them isn’t a real solution. The URL generation logic needs to be addressed. If important content depends on a rendering approach that creates indexing problems, the implementation itself may need to change.
This is one of the reasons I approach technical SEO from both a search and software engineering perspective. Understanding how a website is built makes it easier to identify why a problem is happening rather than simply documenting that the problem exists.
A Technical SEO Audit Should Reflect the Website
There isn’t one technical SEO checklist that should be applied blindly to every website. The right audit depends on the technology, architecture, content, size, business objectives, and search visibility of the site being reviewed. A WordPress business website, an ecommerce platform, and a React-based SaaS application can all have very different technical SEO requirements.
What matters is understanding how the individual system works and then identifying the technical issues that can actually affect its ability to be discovered, understood, indexed, and experienced by users.
For me, that is what makes a technical SEO audit valuable. It isn’t simply about finding errors. It is about understanding the relationship between the way a website is built and the way that website is discovered through search.
Building a More Search-Friendly Website
Technical SEO works best when it is considered as part of development rather than something added after a website has already been built. When site architecture, URLs, internal linking, rendering, performance, content structure, and indexing considerations are addressed early, it becomes much easier to build a website that is both technically sound and search-friendly.
For existing websites, a technical SEO audit can provide a practical starting point by showing where the biggest problems are and which improvements are likely to have the greatest impact. If your website relies heavily on JavaScript, has experienced indexing problems, or has grown into a more complex application over time, the technical side of SEO becomes even more important.
That is the area I focus on through my Technical SEO services; combining SEO principles with an understanding of how modern websites and web applications are actually built.