Technical SEO: A complete checklist for company website owners

Imagine your company website as a magnificent, modern headquarters for your business online, rather than merely a digital business card. You have a beautiful architect-designed façade (design), engaging and persuasive material in every room (content) and excellent customer service (UX). But what about the foundations, electrical installation, ventilation and plumbing? What about architectural plans letting everyone — customers and municipal services (Google's robots) — navigate the building without error? This is technical SEO — the invisible but absolutely crucial backbone of your online presence.

Neglecting technical SEO is like building a skyscraper on sandy ground. However beautiful the interiors and however much effort you invest in marketing, the entire structure could collapse at any moment or, more likely, never be noticed by those searching for it. Without solid technical foundations, your search engine optimisation efforts will be ineffective and frustrating.

Are you ready to put on a hard hat, pick up construction plans and check step by step whether your digital headquarters meet the highest standards, enabling them to dominate the search results skyline? This checklist is your guide.

These are the key inspections we will conduct in your digital building:

• Access and Indexing: We will check whether your headquarters' doors are open to Google's robots and whether they can read the plans.
• Website Architecture: We will examine whether corridors and signs are logical, allowing intuitive navigation throughout the structure.
• Performance and Speed: We will measure how quickly lifts run and doors open — how fast your website loads, crucial for Core Web Vitals.
• Security and Compatibility: We will ensure the building is safe (SSL certificate) and accessible to everyone, whether arriving on foot (desktop) or in a modern vehicle (mobile).
• Advanced Labels: We will learn to add special labels (structured data) so Google's robots understand even better what each room contains.

Does Google have the keys to your digital headquarters? Indexing and crawlability

A crucial element of search engine optimisation strategy is ensuring Google's robots (Googlebots) can enter your website without obstruction, move around and understand its content. This process is called crawlability (the ability to crawl) and indexability (the ability to index). Imagine Googlebot as a building inspector. If it cannot open the front door or encounters locked rooms, it cannot assess your building and add it to the official register (Google's index).

The first step in every technical inspection is verifying basic directives telling robots what they can and cannot do on your website. This is the absolute foundation; neglecting it can make your website completely invisible in search, even though it is published and works correctly.

Is robots.txt blocking access?

The robots.txt file is a simple text file in your website's root directory (e.g. twojastrona.pl/robots.txt), acting as a notice for robots. It tells them which parts of your digital headquarters they should not enter. This is useful for blocking access to administration pages, baskets and internal search results. Problems arise when you accidentally block important resources.

• Check: Visit your website address with /robots.txt appended.
• Look for: The Disallow: / directive. This completely blocks every robot's access to the entire website and is a common development-stage mistake accidentally left on a live website. Ensure you do not block important CSS and JavaScript scripts, because Google must render them to understand your website fully.

Is the XML Sitemap current and submitted to Google?

An XML sitemap is simply a detailed building plan created specifically for robots. It lists every important URL (room) you want Google to find and index. Having a current sitemap is extremely important, especially for large websites or those with pages not easily accessible through standard navigation.

• How to create it: Most CMSs (such as WordPress with plugins like Yoast SEO or Rank Math) generate sitemaps automatically.
• Where to find it: Usually at twojastrona.pl/sitemap.xml or twojastrona.pl/sitemap_index.xml.
• What to do: Copy the sitemap URL and paste it into the appropriate section of the free Google Search Console tool. This is Google's official communication channel, allowing you to monitor your website's technical state.

Are robots meta tags blocking important pages from indexing?

Whereas robots.txt is a website-wide suggestion, a robots meta tag is a firm directive in an individual page's code. It tells robots whether to index that page and follow its links.

• noindex: This tag tells Google: "You can see this page, but please do not add it to search results." It is useful for "thank you for your purchase" pages or terms and conditions that need not appear in Google. Accidentally placing it on your homepage or key service page is disastrous.
• nofollow: This tag says: "Do not follow links on this page." It is used less often, mainly in comment sections or for links whose quality we do not want to vouch for.

You can check these tags by opening the page source (right-click -> "View page source" or Ctrl+U) and searching for <meta name="robots" ...>. Ensure your important pages have index, follow, or no tag at all (equivalent to index, follow). These basics form the core of effective website SEO optimisation, and correct configuration is a prerequisite for further activities.

What do your website's architectural plans look like? Structure and navigation

Once we know Google's inspectors can enter your building, it is time to assess the internal layout. Good information architecture is crucial for search engine optimisation and, above all, users. A logical, intuitive structure lets visitors find what they need easily and Google's robots understand your website's hierarchy and subject matter efficiently. Imagine a chaotic building without room numbers or signposts, with corridors leading nowhere — nobody would want to stay.

Your website's structure influences how "SEO power" (often called "link juice") is distributed within it. The homepage usually has the greatest authority and passes it through internal links to lower levels — categories, products and articles. A considered structure ensures even the furthest corners receive some of that power.

Is the URL structure friendly and logical?

A URL is every room's digital address in your headquarters. It should be short, readable and immediately suggest what the page contains.

• Bad structure: twojastrona.pl/index.php?category=12&product_id=589
• Good structure: twojastrona.pl/buty-meskie/eleganckie/model-oxford-czarny

Good practice for creating URLs:

• Use keywords: They help users and search engines understand the page's subject.
• Be concise: Shorter URLs are easier to remember and share.
• Use hyphens (-) to separate words. Google treats them as separators, while underscores (_) may be interpreted differently.
• Avoid unnecessary parameters and special characters.

Is internal linking consistent and strategic?

Internal linking is the network of corridors and signposts within your website. Every article, menu or footer link connects two rooms. Good internal linking:

• Helps users: Guides them to related, interesting content, increasing time on site.
• Helps Google's robots: Lets them discover every page and understand relationships between pages.
• Distributes authority: Passes "power" from stronger pages (e.g. the homepage) to weaker ones.

Review your key service pages and blog posts. Do they link to other thematically related content on your website? Use descriptive anchor text, e.g. instead of "click here", use "read our technical SEO guide". We invite you to explore our company blog for examples of strategic internal linking in practice.

Have you implemented breadcrumb navigation (Breadcrumbs)?

Breadcrumbs are a small navigation menu, usually at the top, showing users their exact location in the website structure. Example: Homepage > Blog > SEO > Technical SEO.

• UX benefits: Users always know where they are and can easily return to a higher category.
• SEO benefits: Strengthens internal linking structure and helps Google understand the hierarchy. Google often displays breadcrumbs in search results, improving your link's appearance and click-through rate.

Is your website structure "flat"?

A "flat" architecture means every important page is accessible within a few clicks from the homepage (ideally no more than 3-4 clicks). An overly deep structure (e.g. 7 nested levels) makes it difficult for Google's robots to reach the deepest pages, while users get lost. Considered categorisation and good internal linking help flatten the structure.

Does your website run at the speed of light? Core Web Vitals and performance

In today's world, nobody has time to wait. Loading speed is no longer merely a nice extra — it is one of the most important factors influencing search rankings and, more importantly, user experiences. A slow website frustrates visitors, leading to high bounce rates (bounce rate) and lost potential customers. Google, whose goal is to provide the best possible results, accounts for this by introducing Core Web Vitals as an official ranking factor.

Imagine entering an impressive office building, but the lift moves at a snail's pace, doors open late and, when you enter a room, furniture suddenly shifts beneath your feet. You would quickly flee. Users feel exactly the same on a slow, unstable website.

What are Core Web Vitals, and how do you check them?

Core Web Vitals are three specific metrics measuring real user experiences of website speed and stability:

• Largest Contentful Paint (LCP): Measures the loading time of the largest element (e.g. image, text block) in the visible screen area. Put simply, how quickly users see the page's main content.
• Interaction to Next Paint (INP): Measures responsiveness. It checks how quickly the page responds to user interactions (e.g. clicking a button, opening a menu). It replaced the older First Input Delay (FID) metric.
• Cumulative Layout Shift (CLS): Measures visual stability. It checks whether page elements shift unexpectedly while loading (e.g. text "escapes" from beneath the cursor because a large banner has just loaded above it).

You can check your website's metrics with the free Google PageSpeed Insights tool. The following table shows thresholds to aim for:

What most commonly causes poor results, and how do you fix them?

PageSpeed Insights shows your results and identifies specific improvement areas. The most common problems are:

• Unoptimised images: The number one culprit. Oversized JPG/PNG files dramatically slow loading. Solution: Compress images before uploading and use modern formats such as WebP, offering far better compression while maintaining high quality.
• Render-blocking resources: JavaScript scripts and CSS stylesheets that must load and be processed before the browser displays content. Solution: Code minification (removing unnecessary characters), deferring non-critical JavaScript loading and placing critical CSS directly in HTML.
• Slow server response time (TTFB): The time between the browser sending a request and receiving the first response byte from the server. Solution: Good, fast hosting, server-level caching and a CDN (Content Delivery Network).

Speed optimisation is complex, but image compression alone often produces spectacular results. Remember that professional website development must account for these factors from the outset, rather than treat them as extras after completion.

Are your digital headquarters safe and accessible to everyone? HTTPS and mobile-first

The next two pillars of modern technical SEO are security and mobile accessibility. In our building analogy, security means solid locks, surveillance and protection building visitors' trust. Mobile accessibility means the building can be entered and navigated easily through the main entrance (desktop) and a modern automated access ramp for different vehicles (mobile devices). Google takes both issues very seriously.

Does your website use HTTPS?

HTTPS (Hypertext Transfer Protocol Secure) is HTTP's encrypted version. All data transmitted between users' browsers and your server are therefore protected against eavesdropping.

• Why does it matter for SEO? Back in 2014, Google officially announced that HTTPS is a lightweight ranking signal. Modern browsers (such as Chrome) label websites without SSL certificates (which enable HTTPS) as "Not secure".
• Why does it matter for users? A padlock and "Connection is secure" in the address bar build trust. This is essential for websites with forms collecting any user data (even just an email address) and for online shops.
• How do you check? Simply look at the address bar. If the address starts with https:// and you see a padlock, everything is fine. If it starts with http:// and you see a warning, you urgently need an SSL certificate. Most good hosting companies now offer free Let's Encrypt certificates.

Is your website optimised for mobile devices?

The share of internet traffic from mobile devices passed 50% long ago and continues growing. Responding to this trend, Google introduced Mobile-First Indexing. Googlebot therefore primarily analyses, assesses and indexes your website's mobile version. If it is poor, unreadable or nonexistent, your entire website's visibility suffers, even in desktop results.

• What is Responsive Web Design (RWD)? A design approach in which layout and website elements automatically adapt to the viewing device's screen size. It is currently the standard and the best method of ensuring mobile compatibility.
• How do you check? Use the free Google Mobile-Friendly Test. It clearly tells you whether your website is considered mobile-friendly.
• What should you look for? Text must be readable without zooming, clickable elements (buttons, links) sufficiently spaced and content contained within the screen.

Neglecting mobile optimisation today is one of the greatest possible oversights in search engine optimisation. It is like closing your headquarters' main entrance to more than half of potential visitors. Our business analyses and models clearly indicate mobile traffic's growing dominance.

How do you communicate with robots in their language? Structured data and canonical tags

Once the basic foundations are solid, we can move to more advanced ways of communicating with Google's robots. Technical SEO means avoiding errors and actively helping search engines understand your content as well as possible. Structured data (Schema.org) and canonical tags are two powerful tools enabling this. In our building analogy, structured data mean adding detailed labels to every room and piece of equipment, describing their purpose in a universal machine-readable language. Canonical tags are instructions identifying which identical or very similar room is the "original", main one.

What are structured data (Schema.org), and why use them?

Structured data are special code (usually JSON-LD) added to your website to describe its content explicitly to search engine robots. Google can read your content, but structured data eliminate doubts. You tell it: "This is a recipe with this many calories and this preparation time", "This is a product costing this much with these reviews", or "This is an article, and this is its author".

• Benefits: The main benefit is the possibility of appearing in rich results (enhanced results) on Google. These visually attractive search results may contain rating stars, prices, images and expandable FAQs. They attract attention and have significantly higher click-through rates (CTR).
• Popular structured data types:
  • LocalBusiness: For local companies (address, opening hours, phone).
  • Product: For product pages (price, availability, ratings).
  • Recipe: For cooking recipes.
  • FAQPage: For frequently asked question pages.
  • Article: For articles and blog posts.
• How do you check and implement them? Use Google's free Rich Results Test to check correct implementation. Many SEO plugins for popular CMSs generate this code without manual programming.

How does the canonical tag (rel="canonical") solve duplicate content?

Duplicate content means identical or very similar content is available at several URLs. It is an SEO problem because Google does not know which version to index and display, dispersing those pages' "SEO power".

• Typical causes:
  • Versions with and without www (http://twojastrona.pl and http://www.twojastrona.pl).
  • http and https versions
  • Sorting and filtering parameters in online shops (/buty?kolor=czarny and /buty?rozmiar=42 may show the same products).
  • Print versions of pages.

A canonical tag is code in the page's <head> saying: Hey Google, although this page has this URL, consider the version at address X its "original", main version. All authority and ranking signals from duplicate versions are thus consolidated at your chosen address. Correct canonical tag use is crucial to the technical hygiene of large websites and e-commerce shops.

What next, architect? How do you keep the foundations in excellent condition?

We have completed a full technical inspection of your digital headquarters. From checking Google's access through the doors, analysing architectural plans and testing lift performance to verifying security systems and advanced labels. You now have a solid checklist and the knowledge to understand what happens "under the bonnet" of your website. Remember, technical SEO is a continual maintenance and improvement process, rather than a one-off project.

Just as the best buildings need regular inspections and modernisation, your website needs constant attention to maintain its position and adapt to continually changing standards and Google algorithms. This checklist is your roadmap. Start with the basics — ensure you are visible and indexed. Then work through subsequent points step by step, prioritising those most urgent for your situation.

Some tasks, such as improving URL structure or implementing structured data, may require a developer. Others, such as maintaining a sitemap and optimising images, you can successfully do yourself. What matters most is that you now understand why these elements are crucial to your business's online success.

If the scale of these tasks overwhelms you, or you simply want experienced engineers and architects to build and maintain your website's foundations, we are at your service. At Rebrandy, we specialise in building solid, efficient, perfectly optimised websites that become true fortresses in search results. Visit our Contact page and tell us about your project — we will gladly help lift your business to the digital world's highest floors.